Updated on 2024/07/16

写真a

 
MARUYAMA,Toru
 
Organization
Faculty of Chemistry, Materials and Bioengineering Professor
Title
Professor
Contact information
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Degree

  • Doctor of Philosophy ( 2000.3 )

Research Areas

  • Nanotechnology/Materials / Metallic material properties

  • Nanotechnology/Materials / Material processing and microstructure control

  • Nanotechnology/Materials / Metals production and resources production

Education

  • Hokkaido University   Graduate School, Division of Engineering   Materials science and engineering

    2000

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  • Muroran Institute of Technology   Graduate School, Division of Engineering   Materials Science and Technology

    1997

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  • Muroran Institute of Technology   Faculty of Engineering   Department of material science and engineering

    - 1995

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  • Muroran Institute of Technology   Faculty of Engineering   Department of material science and engineering

    - 1995

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    Country: Japan

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  • Muroran Institute of Technology   Graduate School, Division of Engineering   Materials Science and Technology

    1997

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    Country: Japan

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  • Hokkaido University   Graduate School, Division of Engineering   Materials science and engineering

    2000

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    Country: Japan

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Professional Memberships

Committee Memberships

Papers

  • Influence of Gas Replacement in Foamed Pattern on Pattern Decomposition and Mold Filling Rate in Evaporative Pattern Casting Process of Iron Castings Reviewed

    MARUYAMA,Toru

    Journal of Japan Foundry Engineering Society   Vol.94 No.12 Page.748-754   2022.12

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  • Influence of carbon solid solution on mechanical properties and microstructures on (MnFeCoNi)89Cu11 high-entropy alloys Reviewed

    MARUYAMA,Toru, Issei Ohta

    Journal of Japan Foundry Engineering Society   Vol.94 No.9 Page.536-541   2022.9

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  • X-Ray Transmission Observation of Mold Filling Behavior Immediately After Pouring in Cast Iron Full-Mold Reviewed

    MURATA, Yukio, SUGIYAMA, Akira, MARUYAMA,Toru

    Journal of Japan Foundry Engineering Society   Vol.94 No.6 Page.277-281   2022.6

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  • 隙間噴流試験中の銅合金の電気化学反応

    安田 吉伸, 水谷 直弘, 松林 良蔵, 丸山 徹, 春名 匠

    鋳造工学 全国講演大会講演概要集   180   31 - 31   2022

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    Language:Japanese   Publisher:公益社団法人 日本鋳造工学会  

    DOI: 10.11279/jfeskouen.180_31

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  • Influence of Flow Rate of Test Solution on Erosion-Corrosion Resistance of Lead-Free Copper Alloys in Jet-in-Slit Test Reviewed

    YASUDA, Yoshinobu, MIZUTANI, Naohiro, MATSUBAYASHI, Ryozo, MARUYAMA,Toru, HARUNA, Takumi

    Journal of Japan Foundry Engineering Society   Vol.93 No.6 Page.323-330 ( 6 )   2021.6

  • アミノ基を有するシラン系表面含浸材によるコンクリートの乾湿繰返しに対する効果

    鶴田浩章, 丸山徹, 東口剛士

    コンクリート工学年次論文集   Vol.43 Page.ROMBUNNO.1179   2021.6

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  • Electron Microscopy on Cu Element Distribution in Spheroidal Graphite Cast Iron Reviewed

    TAKESHI, Nagase, MARUYAMA,Toru, ASANO, Kazunori, IGARASHI, Yoshio

    Journal of Japan Foundry Engineering Society   Vol.61, (2020),No.9, pp.1853-1861   2020.9

  • Influence of Cu2+ and Cl- on Corrosion of Cu Alloys in Chloride Aqueous Solutions Reviewed

    YASUDA, Yoshinobu, MATSUBAYASHI, Ryozo, MARUYAMA,Toru, HARUNA, Takumi

    Journal of Japan Institute of Copper   第59巻, 1号, 161-166頁   2020.8

  • Measuring the interfacial heat transfer coefficient between flowing molten alloy and sand mold using fluidity tests Reviewed

    MOTOYAMA, Yuichi, TOKUNAGA, Hitoshi, YOSHIDA, Makoto, MARUYAMA,Toru, OKANE, Toshimitsu

    Journal of Materials Processing Technology   Vol. 276 (2020) 116394   2020.2

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    This study specifically examined a method using fluidity test results to measure the interfacial heat transfer coefficient (IHTC) between a molten alloy and a mold during flow. Review of earlier studies revealed that conventional methods require the choking area length to calculate the IHTC during flow, but one earlier study used an assumed choking area length. Details of its length remain unclear. Using an arbitrarily chosen choking area length leads to inaccurate acquisition of the IHTC. For this study, we observed the microstructures and macrostructures around a fluidity test specimen tip to ascertain the choking area length. This value led to calculation of the IHTC between the flowing bronze melt and the shell sand mold as 1521 W/m2•K. This study also found a new method requiring no choking area length to ascertain the IHTC between the flowing melt and the sand mold. The IHTC obtained using this method was 1406 W/m2•K, representing a difference of about 8% from the value obtained using a conventional method. This study assessed experimental conditions under which the new method can produce accurate IHTC values.

    DOI: 10.1016/j.jmatprotec.2019.116394

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  • Corrosion Behavior of Pb-Free Copper Alloys Immersed in Chloride Aqueous Solution Reviewed

    YASUDA, Yoshinobu, ABE, Hiroyuki, MATSUBAYASHI, Ryozo, MARUYAMA,Toru, HARUNA, Takumi

    J. Japan Inst. Metar.   83巻 11号 pp.416-423 ( 11 )   2019.11

  • Microstructural, mechanical, and corrosion properties of plasma-nitrided CoCrFeMnNi high-entropy alloys Reviewed

    NISHOMOTO, Akio, FUKUBE, Takahiro, MARUYAMA,Toru

    Surface and Coatings Technology   Vol.376 (2019), pp.52-58   52 - 58   2019.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE SA  

    Plasma nitriding is used for materials that are challenging to nitride by conventional techniques. Because of the sputtering effect of positive ions during glow discharge, protective oxide films on the surfaces of materials including stainless steels, aluminum alloys, and titanium alloys, can be effectively removed by ion and energetic particle bombardment; thus, nitrogen mass transfer from the plasma into the component subsurface can be achieved effectively. Plasma nitriding therefore has potential applicability to treat high-entropy alloys (HEAs) containing large amounts of strong oxide-forming elements such as chromium. In this study, the effects of plasma nitriding were investigated on the microstructural, mechanical, and corrosion properties of a CoCrFeMnNi HEA with an fcc structure that is soft and ductile. The HEA was produced by melting pure metals and casting. Direct-current plasma nitriding was then performed in a gas mixture of 25% N-2 and 75% H-2 for 54 ks at 673-823 K under 200 Pa with an auxiliary cathodic screen. After nitriding, the nitrided samples were examined using scanning electron microscopy, X-ray diffraction (XRD), Vickers microhardness testing, electron probe micro-analysis, and glow discharge optical emission spectroscopy (GD-OES). After nitriding, GD-OES revealed that the thickness of the nitriding layer tended to increase with increasing nitriding temperature. XRD analysis revealed that an fcc supersaturated solid solution phase was formed on surfaces nitrided below 723 K, whereas a CrN phase was formed on those nitrided above 723 K. The Vickers microhardness of the nitrided sample surfaces reached approximately 1300 HV. Ball-on-disk wear tests revealed that the wear loss of nitrided samples was considerably lower than that for untreated samples. Finally, the pitting corrosion resistance of samples nitrided at 673 K was higher than that of untreated samples.

    DOI: 10.1016/j.surfcoat.2018.06.088

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  • Influence of Tellurium Addition to Spheroidal Graphite Cast Iron on the Number of Graphite Particles Reviewed

    SAITO, Ryuta, MARUYAMA,Toru, NAKAMURA, Toshiki, YANAGITANI, Hitoshi, SAKAI, Takahiro, NAKAMOTO, Kouji

    International Journal of Metalcasting   Vol.13, Issue 3 (2019), pp.571-577   2019.7

  • Effect of Molten Metal Temperature on Mold Filling in Evaporative Pattern Casting Reviewed

    MARUYAMA,Toru, TAMAKI, Mitsuyoshi, NAKAMURA, Gou, NAKAMURA, Keisuke

    International Journal of Metalcasting   Vol.13, Issue 3 (2019), pp.611-617   2019.7

  • 走査透過電子顕微鏡を用いた球状黒鉛鋳鉄核物質の微量元素分布解明 Reviewed

    永瀬丈嗣, 丸山徹, 五十嵐芳夫

    日本金属学会会報・まてりあ   2019.2

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    Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.2320/materia.58.86

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  • Corrosion behavior of lead-free copper alloy castings and their crystallized substances of Cu2S and Bi

    Yoshinobu Yasuda, Hiroyuki Abe, Ryozo Matsubayashi, Toru Maruyama, Takumi Haruna

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals   83 ( 1 )   15 - 22   2019

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Institute of Metals (JIM)  

    We aimed to understand the corrosion behavior of Pb free Cu alloys Japan Industrial Standards JIS CAC411 and CAC901 and the substances Cu2S and Bi, respectively, which are in the alloys as particles, in a 3.0 mass NaCl aqueous solution. The corrosion behavior of the Pb-free Cu alloys and the substances were compared with those of a Cu alloy JIS CAC406, which Pb detected as crystallized particles in it, and a Cu alloy JIS CAC403 without any crystallized substances. Cu2S specimens were produced by sintering Cu2S powders. Bi specimens were produced by Bi electro plating on Cu plates. The measured corrosion potentials of CAC411, CAC901, and CAC403 were close to that of Sn instead of Cu. The anodic polarization curves of all the Cu alloy specimens showed that the anodic current density increased rapidly at a potential above-0.20 V vs. Ag/AgCl, and the rapid increase in the current density was similar to that of Cu. Therefore, it was concluded that the increase in the current density of the Cu alloys results from the dissolution of Cu in a matrix. Cu2S was converted into CuS during the anodic reaction. However, the corrosion potential of Cu2S was higher than those of Cu and CAC411. Therefore, it was concluded that the Cu2S particles in CAC411 act as cathodic sites and remain stable during the natural corrosion. The corrosion potential of Bi was higher than that of CAC901 and slightly lower than that of Cu. At the potentials below-0.10 V vs. Ag/AgCl, Bi was thought to be covered with a passive Bi2O3 film and the passive film was expected to protect Bi from corrosion. Therefore, it was concluded that the Bi particles in CAC901 hardly suffer severe corrosion. The corrosion potential of Pb was lower than those of the Cu and Cu alloys, expect for CAC406. In addition, Pb exhibited a large anodic current density and dissolved actively around the corrosion potential of Cu. Therefore, it was concluded that the Pb particles dissolved preferentially during the corrosion of CAC406 owing to galvanic corrosion. Finally, it was concluded that the Cu2S and the Bi particles in CAC411 and CAC901, respectively, hardly suffer severe corrosion compared with the Pb particles in CAC406 in chloride-containing aqueous solutions such as sea water. c 2018 The Japan Institute of Metals and Materials.

    DOI: 10.2320/jinstmet.J2018034

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  • 隙間噴流試験による硫化物分散型鉛フリー銅合金の耐エロージョン・コロージョン性評価 Reviewed

    安田 吉伸, 水谷 直弘, 阿部 弘幸, 松林 良蔵, 丸山 徹, 春名 匠

    防錆管理   Vol.62,No.3, pp. 79-88 ( 3 )   2018.3

  • Evaluation on erosion-corrosion resistance of sulfide-dispersed lead-free copper alloy by the jet-in-slit test Reviewed

    YASUDA, Yoshinobu, MIZUTANI, Naohiro, ABE, Hiroyuki, MATSUBAYASHI, Ryozo, MARUYAMA,Toru, HARUNA, Takumi

    Rust Prevention & Control Japan   Vol.62,No.3, pp. 79-88 ( 3 )   2018.3

  • Solidification microstructure of AlCoCrFeNi2.1 eutectic high entropy alloy ingots

    Takeshi Nagase, Mamoru Takemura, Mitsuaki Matsumuro, Toru Maruyama

    Materials Transactions   59 ( 2 )   255 - 264   2018

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Institute of Metals (JIM)  

    AlCoCrFeNi2.1 eutectic high-entropy alloy (EHEA) ingots were successfully obtained by high-frequency melting and centrifugal metal- mold casting under an Ar flow. The microstructure of the ingots was investigated by trans-scale observations using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and scanning transmission electron microscopy (STEM). The constituent phases of the ingots were identified as fcc and bcc phases by X-ray diffraction (XRD) analysis, and were not dependent on the position of the ingot. The microstructure was observed to have a primary fcc dendrite and fcc+bcc eutectic structure at the inter- dendrite region, regardless of the position of the ingots. The size of the solidification structure was affected by the cooling rate. Faster cooling rates resulted in finer solidification structures. TEM observations clarified the development of L12 ordering structures in the primary fcc dendrite phase, while the ordering peak could not be detected by XRD analysis.

    DOI: 10.2320/matertrans.F-M2017851

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  • Cathodic Decomposition Reaction of Cu2S in Sulfide-Dispersed Pb-Free Copper Alloy Reviewed

    YASUDA, Yoshinobu, ABE, Hiroyuki, MATSUBAYASHI, Ryozo, MARUYAMA, Toru, HARUNA, Takumi

    Vol.56, pp.184-189 ( 1 )   184 - 189   2017.8

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  • Influence of Sulfide Dispersed in Lead-Free Bronze Casting on Electroplating Reviewed

    Vol. 68, No. 4, pp. 201-207 ( 4 )   201 - 207   2017.4

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  • Solidification Microstructure of AlCoCrFeNi<sub>2.1</sub> Eutectic High Entropy Alloy Ingots Reviewed

    Nagase Takeshi, Takemura Mamoru, Matsumuro Mitsuaki, Maruyama Toru

    Journal of Japan Foundry Engineering Society   Vol. 89, p. 119-129 ( 3 )   119 - 129   2017.3

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    Language:Japanese   Publisher:Japan Foundry Engineering Society  

    <p>  AlCoCrFeNi<sub>2.1</sub> eutectic high entropy alloy (HEA) ingots were successfully obtained by high-frequency melting and centrifugal metallic mold casting under Ar flow. The microstructure of the ingots was investigated by trans-scale observations using optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and scanning transmission electron microscopy (STEM). The constituent phases of the ingots were identified as fcc and bcc phases by X-ray diffraction (XRD) analysis, and were not dependent on the position of the ingots. In particular, dendrite fcc and inter-dendrite fcc and bcc eutectic structures were observed, regardless the position of the ingots. The solidification structure was affected by cooling. Faster cooling rates resulted in finer solidification structures. TEM observations clarified the development of L1<sub>2</sub> ordering structures in the dendrite fcc phase, while the ordering peak could not be detected by XRD analysis.</p>

    DOI: 10.11279/jfes.89.119

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  • Effect of Coating Thickness on the Molten Metal Filling Rate of Cast Iron in the Evaporative Pattern Casting Process

    Toru Maruyama, Gou Nakamura, Mitsuyoshi Tamaki, Keisuke Nakamura

    INTERNATIONAL JOURNAL OF METALCASTING   11 ( 1 )   77 - 83   2017.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:SPRINGER INTERNATIONAL PUBLISHING AG  

    Molten metal filling rate and polystyrene foam pattern decomposition were examined in order to clarify how to improve the metal flow length of cast iron in the evaporative pattern casting process. The molten metal filling rate and the decomposition rate of a polystyrene foam pattern were measured during a casting experiment. A copper alloy was also cast using the same method for the purpose of comparison. The molten metal filling rate of cast iron was lower than that of the copper alloy. The volume of the gas gap increased with increasing melt temperature and decreasing coating permeability. A large amount of liquefied resin was formed by thermal decomposition of the foam pattern. The molten metal filling rate increased with increasing coating permeability and increased further with increasing coating thickness in the final step of molten metal filling. Even with increasing permeability of the coating, there is an occurrence of misruns in the case of molten cast iron, while the use of a thicker coating increased the molten metal flow length.

    DOI: 10.1007/s40962-016-0108-5

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  • Corrosion behavior of lead-free copper alloy castings and their crystallized substances of Cu2S and Bi

    Yoshinobu Yasuda, Hiroyuki Abe, Ryozo Matsubayashi, Toru Maruyama, Takumi Haruna

    Materials Transactions   58 ( 12 )   1679 - 1686   2017

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Japan Institute of Metals (JIM)  

    In this study, we aimed to understand the corrosion behavior of Pb-free Cu alloys (Japan Industrial Standards (JIS) CAC411 and CAC901) and their crystallized substances (Cu2S and Bi, respectively) particles in a 3.0 mass% NaCl aqueous solution, in comparison with those of a Cu alloy (JIS CAC406), its crystallized substance (Pb) particles. and a Cu alloy (JIS CAC403) with no crystallized substances. A Cu2S specimen was produced via sintering Cu2S powders, and a Bi specimen was produced by Bi electro-plating on a Cu substrate. The measured corrosion potentials of CAC411, CAC901, and CAC403 were close to that of Sn instead Cu. The current density peak near the corrosion potential of CAC403, which was the highest Sn concentration, was the largest in comparison with those of the other Cu alloys. Conversely, rapid increase in the current density, which was shown for all the Cu alloy at the potential above -0.20 V vs. Ag/AgCl, was similar to that of Cu. Therefore, it was concluded that these increase in current densities of Cu alloys was due to the dissolution of the Cu matrix. Cu2S was converted into CuS during the anodic reaction. However, the corrosion potential of Cu2S was higher than those of Cu and CAC411. Therefore, it was concluded that the Cu2S particles in CAC411 act as cathodic sites and remain stable during the natural corrosion. The corrosion potential of Bi was higher than that of CAC901 and slightly lower than that of Cu. Further, at the potentials below -0.10 V vs. Ag/AgCl, Bi was thought to be covered with the passive film of Bi2O3 that was expected to protect Bi from corrosion. Therefore, it was concluded that the Bi particles in CAC901 hardly suffer severe corrosion. The corrosion potential of Pb was lower than those of the Cu and Cu alloys expect for CAC406. In addition, Pb exhibited a large anodic current density and dissolved actively around the corrosion potential of Cu. Therefore, it was concluded that the Pb particles dissolved preferentially during the corrosion of CAC406 owing to the galvanic corrosion. It was finally concluded that the Cu2S and the Bi particles in CAC411 and CAC901, respectively, hardly suffer severe corrosion than the Pb particles in CAC406 in chloride-containing aqueous solutions like sea water.

    DOI: 10.2320/matertrans.M2017196

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  • CrMnFeCoNi 系ハイエントロピー合金の硬さに影響を及ぼす冷却速度と熱処理の影響

    高島 和樹, 丸山 徹, 永瀬 丈嗣

    鋳造工学 全国講演大会講演概要集   170   37 - 37   2017

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    Language:Japanese   Publisher:公益社団法人 日本鋳造工学会  

    DOI: 10.11279/jfeskouen.170_37

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  • Influence of Phosphorus on Mechanical Properties, Fluidity and Pressure Toughness of Lead Free Bronze Castings with Dispersed Sulfide Particles Reviewed

    MARUYAMA,Toru, ABE, Hiroyuki, MATSUBAYASHI, Ryozo, TERAMURA, Masakazu, AKASHI, Takafumi, SATOH, Nobuhito, KOBAYASHI, Takeshi

    Journal of Japan Foundry Engineering Society   第87巻, 12号, 849-854頁 ( 12 )   849 - 854   2015.12

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    Language:Japanese   Publisher:Japan Foundry Engineering Society  

    Lead-free bronze castings dispersed with sulfide particles, whose main composition is the same as JIS CAC411, and which contains over 0.05mass% phosphorus as a residual element, were prepared. Tensile test, fluidity test, microstructure test and pressure toughness test of the lead-free bronze castings were carried out. Results of the tensile tests for JIS CAC406 castings, which are used as common bronze castings, show that the elongation of some specimens containing over 0.05 mass% phosphorus is below the JIS requirement of 15%. In contrast, the elongation of the lead-free bronze castings dispersed dispersed with sulfide particles was over 15% even phosphorus content was increased to about 0.1mass%. Increasing the phosphorus content improves the fluidity of the lead-free bronze castings and realizes excellent pressure toughness. In addition, the results of measurement of elemental distribution by EPMA reveal the presence of regions composed of phosphorus and nickel. This suggests that a certain amount of phosphorus exist as a compound composing of phosphorus and nickel.

    DOI: 10.11279/jfes.87.849

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  • Corrosion Properties of Sulfide-Dispersed Lead-Free Bronze Castings by Electrochemical Polarization Method Reviewed

    YASUDA, Yoshinobu, ABE, Hiroyuki, MATSUBAYASHI, Ryozo, MARUYAMA,Toru, HARUNA, Takumi

    Journal of Japan Institute of Copper   第54巻, 1号, 113-118頁 ( 1 )   113 - 118   2015.8

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  • Effect of amount of products suspended in melt after spheroidizing treatment on graphite nodule count in spheroidal graphite cast iron Reviewed

    Toru Maruyama

    Journal of Japan Foundry Engineering Society   第86巻,11号,858-863頁 ( 11 )   858 - 863   2014.11

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    Correlation relationships between graphite nodule count evaluated by casting experiment and equilibrium amount of chemical compounds calculated by thermodynamic calculation were investigated for clarifying effect of graphite nodule count on amount and formation temperature of nuclear products for graphite nucleation in spheroidal graphite cast iron melt. Graphite nodule counts of spheroidal graphite cast iron varied in additive amounts of calcium, aluminum and sulfur were measured. Equilibrium phases in the cast iron melt with same chemical compositions were calculated in a condition at 1150℃ without graphite crystallization. Calculated melting points of oxysulfdie in which is composed mostly of sulfides was higher than temperature of spheroidizing treatment. It is suggested that the oxysulfide is suspended in the melt before pouring. Magnesium nitride was stable in temperature below 1300℃-1350℃, and in a case that aluminum content was increased to about 0.02mass%, aluminum nitride was stable in temperature below 1300℃-1380℃. There is negative correlation between the graphite nodule count and the amount of aluminum nitride although there are no correlation relationships between graphite nodule count and formation temperature and amount of the oxysulfide, magnesium oxide and magnesium nitride.

    DOI: 10.11279/jfes.86.858

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  • Effect of temperature of solution and aging heat treatment on hardness of Cu-Zn-Ni-Mn system alloy Reviewed

    MARUYAMA,Toru, YAMAZAKI, Masaru, KUROSE, Kazuhito, HAGIWARA, Kohichi

    Journal of Japan Institute of Copper   第53巻, 1号, 78-82頁 ( 1 )   78 - 82   2014.8

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    Temperature of solution heat treatment and aging heat treatment of Cu-Zn-Ni-Mn-Pb alloy were investigated by thermodynamics calculation, microstructural analysis and evaluation of hardness. Solution heat treatment temperature is 700℃. β’phase is precipitated by aging heat treatment at 500℃ and 400℃. Phase boundary between β phase and β’ phase was estimated by thermodynamics calculation. Hardness of the alloy decreases with increasing aging time just after starting aging heat treatment, and increases with increasing aging time after 1h in the case of 500℃ and 2h in the case of 400℃.

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  • Preparation of Lead-Free Machinable Brass dispersed MnS by Hot Extrusion of Machined Chips Reviewed

    SATO, Naoki, TAKEDA, Ryosuke, NISHIMOTO, Akio, MARUYAMA,Toru

    第53巻, 1号, 150-155頁 ( 1 )   150 - 155   2014.8

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  • Effect of Cooling Rate and Dissolved Oxygen Content on Sulfide Morphology in Cu-Sn-Zn-S Alloy Castings Reviewed

    Ryoko Yoshida, Toru Maruyama, Hiroyuki Abe, Ryozo Matsubayashi, Masakazu Teramura, Takeshi Kobayashi, Toshihide Takenaka

    Journal of Japan Foundry Engineering Society   86巻, 1号, 26-30頁 ( 1 )   26 - 30   2014.1

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    <p>  The sulfide morphology in Cu-Sn-Zn-S alloy castings was investigated to understand the transition from eutectic solidification to monotectic solidification. The sulfide morphology was observed to clarify whether sulfides were formed by eutectic reaction or monotectic reaction. The cooling rate during solidification was changed by changing mold materials, mold shapes, and mold sizes. The holding time from deoxidation of melt to casting was changed to understand the effect of deoxidation on the sulfide morphology. Eutectic sulfides were formed when the melt was cooled slowly, and the amount of monotectic sulfide increased with increasing cooling rate. The transition from eutectic morphology to monotectic morphology occurred at cooling rates of 0.5K/s to 1.0K/s. Just after deoxidation with Cu-P alloys, sulfides were formed by monotectic reaction. However, with increasing holding time of the melt after deoxidation, the amount of the sulfides formed by eutectic reaction increased.</p>

    DOI: 10.11279/jfes.86.26

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  • Effect of Work Hardening of Substrate Surface on Adhesion of Zinc Alloy Sprayed Coatings Reviewed

    Toru Maruyama, Mitsuhiro Hirohata

    Journal of Japan Thermal Spray Society   50巻, 2号, 64-67頁 ( 2 )   64 - 67   2013.4

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    Language:Japanese   Publisher:Japan Thermal Spray Society  

    Adhesive strength of zinc alloy sprayed coatings on an annealed steel substrate after girt blasting was measured to understand an effect of work hardening of a substrate surface on adhesive strength between the substrate and the sprayed coatings. The annealed substrate was prepared by heat treatment in reduced atmosphere. The sprayed coatings were prepared by a wire flame spraying process. Degree of work hardening of the substrate was changed by changing blasting time. In the case without annealing, the hardness of the blasted substrate increases with increasing blasting time, and the adhesion increases with increasing hardness of the blasted substrate surface. In the case with annealing, the hardness of the blasted substrate is same as the hardness before blasting. Nevertheless, the adhesion is almost same as the case without annealing. There are no effects of work hardening of the steel substrate surface on the adhesion of the zinc alloy sprayed coatings.

    DOI: 10.11330/jtss.50.64

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    Other Link: https://jlc.jst.go.jp/DN/JALC/10019328644?from=CiNii

  • Solidification Cracking Resistance in Permanent Mold Casting Process for Sulfide Dispersed Lead Free Bronze Castings Reviewed

    Ryoko Yoshida, Toru Maruyama, Hiroyuki Abe, Ryozo Matsubayashi, Masakazu Teramura, Takeshi Kobayashi, Toshihide Takenaka

    Journal of Japan Foundry Engineering Society   84巻, 7号, 383-388頁 ( 7 )   383 - 388   2012.7

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    Language:Japanese   Publisher:Japan Foundry Engineering Society  

    The applicability of the permanent mold casting process for the lead free bronze with dispersed sulfide was evaluated with comparison of other conventional copper alloys, such as the leaded bronze, the leaded brass, the lead free bronze including bismuth. The copper alloys were cast into the permanent mold for the solidification cracking test. The relationship between the degree of cracking and the range of the solidification temperature was examined.The lead free bronze with dispersed sulfide was more unbreakable than the other copper alloys. The smaller solidification temperature range, the harder the solidification cracking occurred. In the lead free bronze with dispersed sulfide, there were differences of the dendrite form near by the fracture and the distribution of the residual melt segregated at a part of the end of the solidification. The lead free bronze may have a solidification form being unlikely to crack, and it is possible to apply the permanent mold castings process rather than the other copper alloys. The applicability is almost same as brass castings.

    DOI: 10.11279/jfes.84.383

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  • EFFECT OF NITRIDING PARAMETER ON ACTIVE SCREEN PLASMA NITRIDING RESPONSE OF SACM645 STEEL Reviewed

    MARUYAMA,Toru, NISHIMOTO,Akio, NII,Hiroaki, HARUNA,Takumi, MIYAKE,Hidekazu

    Sci Technol Rep Kansai Univ   No.54 Page.183-190   183 - 190   2012.3

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  • Influence of Alloying Elements on Sulfide Formation in Lead Free Bronze Castings with Dispersed Sulfide Particles

    Toru Maruyama, Hiroyuki Abe, Kazuteru Hirose, Ryozo Matsubayashi, Takeshi Kobayashi

    MATERIALS TRANSACTIONS   53 ( 2 )   380 - 384   2012.2

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    The influence of the zinc sulfide ratio in the sulfide particle in the lead free bronze castings on the machinability is studied. Also, the influence of alloying elements of the zinc sulfide ratio of the sulfide particle is studied for understanding the mechanism of the zinc sulfide formation during the solidification. The zinc sulfide ratio is evaluated with the analysis of the microstructure in the lead free bronze prepared by the sand mold casting. The condition in which the zinc sulfide stably exists during the solidification is estimated with thermodynamic calculation. The machinability is improved with the decrement of the zinc sulfide ratio. The sulfide is formed as the copper sulfide and the zinc sulfide through eutectic reaction, and also appears as the liquid phase through monotectic reaction. The zinc sulfide is formed with the copper sulfide at the temperature, at which the zinc sulfide was predicted lobe unstable by the thermodynamic calculation. The ratio of the zinc sulfide increases with increasing zinc content. Tin does not affect the zinc sulfide ratio when the tin content is less than about 4 mass%. There is no effect of nickel on the zinc sulfide ratio. [doi:10.2320/matertrans.F-M2011835]

    DOI: 10.2320/matertrans.F-M2011835

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  • Wetting Behavior of Carbon in Molten Carbonate

    Chia-Chin Chen, Toru Maruyama, Ping-Hsun Hsieh, J. Robert Selman

    JOURNAL OF THE ELECTROCHEMICAL SOCIETY   159 ( 10 )   D597 - D604   2012

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    This paper aims at quantifying the wettability of the solid carbon fuel by the molten carbonate in a Direct Carbon Fuel Cell (DCFC), to understand its effect on DCFC performance. The wetting behavior of carbon (graphite) under different conditions is observed and analyzed. Direct observation and the time evolution of open circuit potentials (OCP) measured in this work suggest that the wetting phenomena are driven not only by capillary forces but also by the electrochemistry of the reverse Boudouard reaction. A semi-quantitative model is proposed to explain the wetting dynamics of carbon. It shows that the progress of wetting is determined primarily by the production of CO at the carbon surface due to the reverse Boudouard reaction, and the OCP is therefore determined by the rate of the reverse Boudouard reaction as well as the mass transfer limitation of CO removal from the electrode. Consequently, the OCP is a function of operating temperature, ambient gas composition, and the immersed length of carbon electrode. (C) 2012 The Electrochemical Society. [DOI: 10.1149/2.022210jes] All rights reserved.

    DOI: 10.1149/2.022210jes

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  • Influence of alloying elements on sulfide formation in lead free bronze castings with dispersed sulfide particles

    Toru Maruyama, Hiroyuki Abe, Kazuteru Hirose, Ryozo Matsubayashi, Takeshi Kobayashi

    Materials Transactions   53 ( 2 )   380 - 384   2012

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    The influence of the zinc sulfide ratio in the sulfide particle in the lead free bronze castings on the machinability is studied. Also, the influence of alloying elements of the zinc sulfide ratio of the sulfide particle is studied for understanding the mechanism of the zinc sulfide formation during the solidification. The zinc sulfide ratio is evaluated with the analysis of the microstructure in the lead free bronze prepared by the sand mold casting. The condition in which the zinc sulfide stably exists during the solidification is estimated with thermodynamic calculation. The machinability is improved with the decrement of the zinc sulfide ratio. The sulfide is formed as the copper sulfide and the zinc sulfide through eutectic reaction, and also appears as the liquid phase through monotectic reaction. The zinc sulfide is formed with the copper sulfide at the temperature, at which the zinc sulfide was predicted to be unstable by the thermodynamic calculation. The ratio of the zinc sulfide increases with increasing zinc content. Tin does not affect the zinc sulfide ratio when the tin content is less than about 4 mass%. There is no effect of nickel on the zinc sulfide ratio. © 2012 Japan Foundry Engineering Society.

    DOI: 10.2320/matertrans.F-M2011835

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  • Improvement of Frictional Wear Property of Lead-free Bronze Castings by Lamellar Eutectoid Structure Reviewed

    FUNAKI Katsuyuki, MINAMIKAWA Toshiharu, OKANE Toshimitu, KOBAYASHI Takeshi, MARUYAMA Touru, AKASHI Takafumi

    THE JOURNAL OF THE JAPAN FOUNDRYMEN'S SOCIETY   Vo. 83, (9), 513-518 ( 9 )   513 - 518   2011.9

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    For substitution of lead bronze, the metallic structure control technique using the eutectoid transformation was employed to develop leadfree or low lead copper alloys for bearings. A lot of the lamellar eutectoid structure of the coppertin based intermetallic compound and the copper solid solution containing fine bismuth precipitates were dispersed in ascast alloys by means of the alloy design technique. The lamellar eutectoid structurewas formed between primary α dendrite arms after transformation of a part of β phase without producing granular δ phases. In the range of tin content from 4 to 12 mass%, the amount of the eutectoid structure was linearly increased with the tin content. And above 12 mass%, it was turned to decreasing. The alloy containing of the lamellar eutectoid structure showed higher antiseizing and higher abrasion resistances than those of the lead bronze LBC3. It was considered that the texture of laminate composite and fine bismuth precipitates containing were produced an excellent results to the frictionalwear properties.

    DOI: 10.11279/jfes.83.513

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  • Sintering and tribological properties of lead-free bronze alloy for friction materials

    Tomohiro Sato, Yoshimasa Hirai, Toru Maruyama, Takeshi Kobayashi

    POWDER METALLURGY   54 ( 1 )   10 - 12   2011.2

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    DOI: 10.1179/003258911X12959522442673

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  • Sintering and tribological properties of lead-free bronze alloy for friction materials

    Tomohiro Sato, Yoshimasa Hirai, Toru Maruyama, Takeshi Kobayashi

    POWDER METALLURGY   54 ( 1 )   10 - 12   2011.2

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    DOI: 10.1179/003258911X12959522442673

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  • Sintering Processes of Pb-Free Copper Alloy for Friction Materials Reviewed

    SATO T.

    Proc. Powder Metallurgy World Congress and Exhibition 2010, 2   Vol. 2, 313-319   2010.10

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  • Tribological Properties of Sulfide Dispersed Pb-Free Copper Alloy Reviewed

    Y. Hirai(Kurimoto tekko), T. Sato(Kurimoto tekko), T. Maruyama, T. Kobayashi(ORDIST Researcher)

    Proceedings of the World Powder Metallurgy 2010 Conference   Vol. 4, 161-165   2010.10

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  • Degassing and Deoxidation Reaction in Casting for Cupronickel Reviewed

    Copper and copper alloy   Vol.49, (1), 297-302 ( 1 )   297 - 302   2010.8

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    Hydrogen solubility in molten cupronickel is significantly increased by the presence of Ni. Therefore, gas defects become a major problem. In addition copper alloys to dissolve hydrogen and oxygen while maintaining a certain balance. Therefore, in order to produce a sound casting, it is necessary to remove hydrogen and oxygen are at the same time.So, CaF2 studied the simultaneous treatment with degassing and deoxidation. Shown by the following formula CaF2 deoxidation reaction when using the degassing.CaF2 + O + 2H → CaO + 2HF↑ ………(1)(1) can be performed simultaneously in the reaction of dehydrogenation and deoxidation expression. After dissolving soluble materials, CaF2 completely covered with the molten metal in flux. The lining of a pressure agent graphite Rutsu (Al2O3) in a mixture of CaF2 and attempted to improve the effect of degassing and deoxidation. The results obtained are as follows.CaF2 reduces the amount of gas to cover the defects in the flux of molten metal containing. In addition, the effect showed a tendency to increase the longer the degassing and deoxidation time of flux coating. The lining of the crucible during the drug showed a tendency to improve the effect of CaF2 deoxidation and degassing and mixing.

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  • Casting Structure, Mechanical Properties and Machinability with Changes in Amount of Alloyed Elements of Sulfide Dispersed Lead Free Bronze Castings Reviewed

    MARUYAMA Toru, ABE Hiroyuki, MATSUBAYASHI Masaki, MARU Naoki, AKASHI Takashi, TACHIBANA Tetsuyuki, KOBAYASHI Takesi

    Journal of Japan Foundry Engineering Society   Vol.81, (12), 667-673 ( 12 )   667 - 673   2009.12

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  • Castability and Cutting Conditions of Sulfide Dispersed Lead Free Bronze Castings Reviewed

    ABE Hiroyuki, MARUYAMA Toru, YASU Takuya, MATSUBAYASHI Riyouzou, KOBAYASHI Takesi

    Journal of Japan Foundry Engineering Society   Vol.81, (12), 661-666 ( 12 )   661 - 666   2009.12

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  • Structure Control and Characteristics of Solidification on Sulfide Dispersed Lead-Free Bronze Castings Reviewed

    KOBAYASHI Takeshi, AKASHI Iwao, MARUYAMA Tooru, ABE Hiroyuki, SUGITANI Takashi, WAKAI Hiroaki

    Journal of Japan Foundry Engineering Society   Vol.81, (12), 650-660 ( 12 )   650 - 660   2009.12

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  • Casting Structure, Mechanical Properties and Machinability with Changes in Amount of Alloyed Elements of Sulfide Dispersed Lead Free Bronze Castings Reviewed

    MARUYAMA Toru, ABE Hiroyuki, MATSUBAYASHI Masaki, MARU Naoki, AKASHI Takashi, TACHIBANA Tetsuyuki, KOBAYASHI Takesi

    Journal of Japan Foundry Engineering Society   Vol.81 No.12 Page.667-673 ( 12 )   667 - 673   2009.12

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  • Development of New Copper Alloy : Influence of Metallic Elements on the Human Body

    Akamatsu Katsuya, Kobayashi Takeshi, Nishimoto Akio

    Engineering & technology   Vol.16, 31-36   31 - 36   2009.12

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  • ブラスト処理の残留グリッド量が溶射皮膜に及ぼす影響

    丸山 徹, 宮崎智也(D), 小林 武

    溶射技術   Vol.29, (2), 53-56   2009.7

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  • Thermal Decomposition Products of Expanded Polystyrene Pattern in Evaporative Pattern Casting of Cast Iron

    MARUYAMA Toru, GOTO Naoki, KOBAYASHI Takesi

    Journal of Japan Foundry Engineering Society   Vol. 81, (3), 117-122 ( 3 )   117 - 122   2009.3

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  • Some Properties of Sulfide Dispersed Lead Free Copper Alloy Castings

    T. Maruyama, H. Wakai, H. Abe, T. Kobayashi

    Transactions of American Foundry Society   116, 299-307   2008.5

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  • Temperature Measurement in Thermal Decomposition Gas Gap on Evaporative Pattern Casting of Cast Iron

    T. Maruyama, N. Gotoh, T. Nakagawa, T. Kobayashi

    Transactions of American Foundry Society   933-942   2008.5

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  • Visualization hiding minute temperature change in thermal analysis curve by statistical treatment using personal computer

    No.22, 43-52   43 - 52   2008.4

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  • Trends in surface modification technology of metallic materials

    Engineering & technology   Vol.14, (1), 77-80 ( 1 )   77 - 80   2007.11

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  • Effects of blasting parameters on removability of residual grit

    T. Maruyama, K. Akagi, T. Kobayashi

    JOURNAL OF THERMAL SPRAY TECHNOLOGY   15 ( 4 )   817 - 821   2006.12

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    This article shows the quantitative evaluation of the residual grit on a blasted substrate, and the removability of the residual grit is examined. Carbon steel plates were blasted by white alumina grit with mean diameters of 338 to 1106 mu m. The velocity and the number of grit particles were measured during blasting. The residual grit was removed from a substrate surface by the dissolution of the blasted substrate surface. A mixed acid solution was used as the dissolution solution. The residual grit weight was 7 to 17 g/m(2). The amount of the residual grit and the penetration depth of the embedded grit increased with increasing grit size. The penetration depth was 5 to 9% of the mean diameter of the grit. The residual grit weight and the penetration depth increased with the increase of the momentum of the grit particle.

    DOI: 10.1361/105996306X147018

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  • Cu-Zn合金におけるBiのZn当量に及ぼすBi添加量と冷却速度の影響

    小林 武, 丸山 徹, 坂口祐樹

    銅と銅合金   45,106-110 ( 1 )   106 - 110   2006.8

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  • Atomization of Corson System Alloy by Rotating Electrode Process and Properties of its Sintered Products

    Copper and copper alloy   45, 31-36 ( 1 )   31 - 36   2006.8

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  • A spray coating and its mechanical properties of Al-Si-Zn alloy produced by the spray forming process

    Toru Maruyama, Takeshi Kobayashi, Masatoshi Kano

    MATERIALS TRANSACTIONS   47 ( 7 )   1853 - 1858   2006.7

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    A 55mass%Al-L5mass%Si-Zn system alloy with good corrosion resistance was sprayed on a plaster substrate. Then, the formation process and some properties of the sprayed coating were investigated. Using the interrupted quenching method, it was found that the sprayed coating structure was not only the layer structure but also a casting structure. Due to large solidification range, the solidification pattern was a mushy type with characteristic of Al-Si-Zn alloys. The maximum temperature and the shrinkage ratio of the sprayed coating decreased as the spray distance increased, due to the decreasing melt particle temperature. Tensile strength and the elongation of the sprayed coating decreased as the spray distance increased, due to an increase in the porosity ratio. In particular, a large amount of oxide was formed in the sprayed coating when air was used as the carrier gas. This oxide formation causes an increase in the shrinkage ratio.

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  • Effects of Permeability of Coating on Surface Shapes of Expandable Pattern during Thermal Decomposition and Molten Cast Iron in Evaporative Pattern Casting

    MARUYAMA Toru, KATSUKI Kosei, KOBAYASHI Takeshi

    THE JOURNAL OF THE JAPAN FOUNDRYMEN'S SOCIETY   Vol.78, (2), 53-58 ( 2 )   53 - 58   2006.2

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    In the planning of defect prevention for the evaporative pattern casting of cast iron, it is necessary to understand the behavior of expandable pattern during thermal decomposition as well as the melt filling behavior. In this study therefore, the effects of the permeability of the coating of the expandable pattern on its surface shape during thermal decomposition, the surface shape of the molten cast iron and the gas gap thickness were investigated, and the following results were obtained. <br>  Convex height in the surface shape of the expandable pattern during thermal decomposition of expandable pattern and that of molten cast iron increases when the coating permeability is low. The shape of the pattern surface does not always correspond exactly with the shape of the melt surface, and in this case the shape of thermal decomposition gas gap becomes the shape of the convex lens. Further, a low coating permeabilityleads to a larger gas gap thickness. The mean decomposition gas pressure, on the other hand, was found to show a level slightly lower than the melt head, and effect of the permeability of the coating is not significant.

    DOI: 10.11279/jfes.78.53

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  • Effect of Sn addition contents and cooling rate on Zinc equivalent of Sn on Cu-Zn Alloy Reviewed

    MARUYAMA Toru, Takeshi Kobayashi, Yuki Sakaguchi

    Journal of Japan Research Institute for Advanced Copper-Base Materials and Technologies   第44巻 56頁-61頁 ( 1 )   62 - 67   2005.8

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    Sn are added to brass, for example, the high strength brass, to improve its corrosion resistance. An added Sn is dissolved in the alpha and beta phases, without forming new phase in such case. The phase fraction is changed by Sn addition. The conversion equation was presented by Guillet to predict the zinc content corresponding to that in the Cu-Zn binary system alloy, and the parameter used in this equation is called the ”zinc equivalent”. Though the research on the zinc equivalent was studied by many researchers, the effects of the added element quantity, zinc quantity and the cooling rate are not taken into consideration. In this study, Alloys in the Cu-Zn-Sn system with various Sn and Zn contents were cast in molds of various cooling rate, and the effects of Sn content, Zn content and cooling rate on the zinc equivalent are investigated based on thermal analysis and microstructure observations.With an increase in Sn or Zn content, beta phase fraction and the dependence of beta phase fraction on the cooling rate increased. The undercooling of phase transformation from beta to alpha increased with an increase in Sn content. The zinc equivalent of Sn increased with an increase in cooling rate. However, in case of low cooling rate in regardless of quantity of Sn and Zn, the zinc equivalent was a value close to 2.0 shown by Guillet.

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  • Effect of Ni addition contents and cooling rate on Zinc equivalent of Ni on Cu-Zn Alloy Reviewed

    MARUYAMA Toru, Takeshi Kobayashi, Yuki Sakaguchi

    Journal of Japan Research Institute for Advanced Copper-Base Materials and Technologies   第44巻 62頁-67頁 ( 1 )   56 - 61   2005.8

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    Elements are added to brass to improve its the properties, such as toughness, corrosion resistance and abrasion resistance. An added element is dissolved in the alpha and beta phases, without forming new phase, though the phase fraction does change depending on the added element. The conversion equation was presented by Guillet to predict the zinc content corresponding to that in the Cu-Zn binary system alloy, and the parameter used in this equation is called the ”zinc equivalent”. After his study, many results have been reported by other researchers. Though some reports showed approximate values of zinc equivalent by Guillet, values of zinc equivalent of transition element such as Fe or Ni were different between researchers. The effects of the quantity of added element and the cooling rate are not taken into consideration. In this study, Alloys in the Cu-Zn-Ni system with various Ni and Zn contents were cast in molds of various cooling rate, and the effects of Ni content, Zn content and cooling rate on the zinc equivalent are investigated based on thermal analysis and microstructure observations.In the case where the Ni content was altered from 1 mass% to 3 mass% and zinc content was taken to be a constant of 38 mass%, the dependence of beta phase fraction on the cooling rate increases. The zinc equivalent of Ni was approximately -1.3, even if Ni content was changed.In the case where the Ni content was fixed to 1 mass% and zinc content was changed from 38 mass% to 42 mass%, beta phase fraction increased with an increase in Zn content. The dependence of beta phase fraction on the cooling rate increases. The zinc equivalent of Ni increased with an increase in cooling rate. However, in case of low cooling rate, the zinc equivalent was a value close to -1.3 shown by Guillet.

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  • Effect of Cooling rate on beta Phase Fraction of Cu-Zn Alloy Reviewed

    MARUYAMA Toru, Yuki Sakaguchi, Takeshi Kobayashi

    Journal of Japan Research Institute for Advanced Copper-Base Materials and Technologies   第43巻 31頁-35頁 ( 1 )   36 - 41   2004.8

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    The (alpha + beta) brass is used widely. Mechanical properties of the alloy are determined by phase fractions of alpha and beta, and so the microstructure control of alpha/beta phases is important. The primary beta phase is partially transformed to alpha by cooling after solidification. Alloyies with different compositions of (alpha + beta) brass were casted, and the relationship between the cooling rate and the undercooling temperatures of the first beta to alpha transformation besides the area fraction of the beta phase were determined. The temperature of the casts were digitally recorded untill 573K. The cooling curves, differential curves, secondary differential curves, and contribution ratio curves were determined. From these curves the phase transformation temperature was specified. The area fraction of beta phase was determined by image analysis of the cast microstructure. Cooling rates were controlled by using several mold materials. The results were as follows:The temperature at the start of the phase transformation from beta to alpha decreased with the cooling rate, and the undercooling temperature of this transformation increased. This tendency becomes remarkable with high zinc content. The beta phase fraction increases with cooling rate and zinc content. There was a liner relation between the square root of the cooling rate and the beta phase fraction. This tendency was remarkable with a high zinc content.The temperature at the start of the phase transformation from beta to alpha decreased with the cooling rate, and the undercooling temperature of this transformation increased. This tendency becomes remarkable with high zinc content. The beta phase fraction increases with cooling rate and zinc content. There was a liner relation between the square root of the cooling rate and the beta phase fraction. This tendency was remarkable with a high zinc content.

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  • Effect of Si Content and Cooling Rate on beta Phase Fraction in Cu-Zn Alloy Reviewed

    MARUYAMA Toru, Yuki Sakaguchi, Takeshi Kobayashi

    Journal of Japan Research Institute for Advanced Copper-Base Materials and Technologies   第43巻 36頁-41頁 ( 1 )   36 - 41   2004.8

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    Elements are added to brass to improve its the properties, such as toughness, corrosion resistance and abrasion resistance. An added element is dissolved in the alpha and beta phases, without forming new phase, though the phase fraction does change depending on the added element. The conversion equation was presented by Guillet to predict the zinc content corresponding to that in the Cu-Zn binary system alloy, and the parameter used in this equation is called the ”zinc equivalent”. Though the zinc equivalent has been used as an index for microstructure control for many years, the effects of the quantityof added element and the cooling rate are not taken into consideration. In this study, the effects of the amount of added element and cooling rate on the zinc equivalent are investigated based on thermal analysis and microstructure observations. Alloys in the Cu-Zn-Si system with various Si and Zn contents were cast. In the case where the Si content was altered, the apparent zinc content calculated by Guillet's conversion equation was taken to be a constant. In this calculation, the zinc equivalent of Si was set to 10, and the obtained results were as follows.When the Si content was changed, the beta phase fraction increased with an increase in the cooling rate. However, no such tendency was found when increasing the Si content. This increase in Si content reduced the predictability of the cooling rate. Although the zinc equivalent of Si increased with an increase in the cooling rate in the case of a low Si amount, it remained constant regardless of the cooling rate in case of a high Si content.When the Si content was fixed, the beta phase fraction increased with an increase in zinc content. In this case, however, the change in the beta phase fraction was almost constant, even when the cooling rate increased. Moreover, the increase in zinc content raised the silicon's zinc equivalence. However, the zinc equivalent of Si did not actually change, even when the cooling rate increased. In this experiment, zinc equivalent of Si was less than 10 in all samples.

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  • Characterization of pure aluminum and zinc sprayed coatings produced by flame spraying

    T Kobayashi, T Maruyama, M Kano

    MATERIALS TRANSACTIONS   44 ( 12 )   2711 - 2717   2003.12

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    We investigate flame spraying of pure aluminum and pure zinc powders on various different substrates and study shrinkage properties and thermal analysis curves of sprayed coatings during the forming process. We also examined effects of the spray distance on the porosity, tensile strength and hardness of sprayed coatings, and obtained the following results. With an increase in spray distance, shrinkage of the sprayed coating and the maximum temperature in the thermal analysis curve decrease. When the cooling ability of the substrate is higher, the shrinkage ratio and the maximum temperature become decrease. The porosity and the hardness of a sprayed coating increase with an increase in spray distance. This occurs because with the increase in the spray distance, the temperature of the sprayed particles decreases, the amount of air taken in the spray increases and, as a result, the cooling rate of the coating increases. The tensile strength of a pure aluminum coating decreases with an increase in spray distance due to the introduction of pores. On the contrary, the tensile strength of a pure zinc coating increases with an increase in spray distance. This occurs because when the spray distance is short, coating temperature is high and, as a result, a large quantity of zinc oxide is formed.

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  • Thermal decomposition behavior of expandable pattern including blended metal or metal oxide powder in evaporative pattern casting of Al-Si system alloy

    T Kobayashi, T Maruyama

    MATERIALS TRANSACTIONS   44 ( 11 )   2404 - 2409   2003.11

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    We investigated thermal decomposition behavior of expanded patterns including thermal decomposition accelerators such as Ni, NiO, CuO and Cu2O (hereinafter referred to as "powder-blended expanded patterns") in an aluminum alloy evaporative pattern casting process; the following results were obtained. When these metal or metal oxide powders were blended in EPS (expandable polystyrene) patterns, an exothermic reaction occurred between metal or metal oxide powder and aluminum alloy melt. This reaction prevented, temperature drop at the top of the melt flow. In addition, these kinds of powder accelerated pattern thermal decomposition. As a result, the pattern thermal decomposition gas volume increased and aluminum alloy melt filling decreased.

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  • Thermal decomposition behavior of expandable pattern including blended metal or alloy powder in evaporative pattern casting process of cast iron

    T Kobayashi, T Maruyama

    MATERIALS TRANSACTIONS   44 ( 11 )   2396 - 2403   2003.11

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    Metal or alloy powder capable of exothermic reaction with cast iron melt was blended into expandable polystyrene patterns. The behavior of thermal decomposition of the expandable patterns in evaporative pattern casting of cast iron was investigated. In evaporative pattern casting in which patterns including blended powder of metallic Si, Fe-Si alloy, Fe-Si-Mg alloy, or Fe-Si-Ca alloy were used, the temperature of the melt was higher than that in casting with original non-blended patterns. When the blending ratio was increased, the volume and pressure of decomposition gas during casting process were increased and, on the other hand, the filling rate of the melt was reduced. The use of patterns blended with powder caused no defect and abnormal structure in castings. These results imply that blending of metal or alloy powder into a pattern accelerates thermal decomposition of the pattern.

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  • Structure and machinability on hot extrusion material of Pb free Cu-Zn system alloy which dispersed fine graphite particles Reviewed

    MARUYAMA Toru, Takeshi Kobayashi, Kazuyoshi Nakao, Youtarou Murakami

    42巻 223-228 ( 1 )   223 - 228   2003.8

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    The melting of the lead free free-cutting brass in which the fine graphite particle dispersed was tried, and the alloy was cast in the permanent mold. The hot direct and indirect extrusion were carried out for the casting billet. Results of structure and machinabillity of obtained extrusion lots are as follows. (1) The creak of ”a check” had occurred on the surface of the lot in the direct extrusion. It was known that graphite particles coheres and enriches by the plastic flow of the alloy in the ring on the lot circumference. (2) On the indirect extrusion, the tendency in which the graphite particle reversely cohered in center part on lot cross section was recognized. (3) It was known that the distribution density of graphite particle at the lot greatly influenced machinabillity.

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  • Influence of zinc vapor pressure on disperse composite of fine graphite particle in Cu-Zn system alloy Reviewed

    MARUYAMA Toru, Takeshi Kobayashi, Kazuyoshi Nakao, Youtarou Murakami

    Journal of the JRICu   第42巻,217-222頁 ( 1 )   217 - 228   2003.8

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    Zinc quantity on Cu-Zn-Ti alloy was made to change within 25 to 40 mass% in the alloy. The fine graphite particle was agitated and added in the alloy melt. The results were as follows. The graphite area fraction was almost fixed regardless of the zinc content, even if the zinc content change, when the vapor pressure of zinc was fixed. The graphite particle adhered and caught to the zinc vapor bubble when the vapor pressure of zinc rises. It was guessed that the graphite particle surface and separate from melt because of this phenomenon. The formation mechanism of the zinc vapor bubble was considered as following. The cavitation occur behind the impeller when Cu-Zn alloy melt is stirred with the impeller, and the small bubble forms in the cavitation. Therefore, the small bubble grew into large by gathering and uniting.

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  • Machinability of Pb free Cu-Zn system alloy in which Si system compound dispersed Reviewed

    MARUYAMA Toru, Takeshi Kobayashi, Kazuyoshi Nakao, Youtarou Murakami

    第42巻,212-216頁 ( 1 )   212 - 216   2003.8

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    Free cutting brass containing lead has excellent machinability. However, the intake of the lead is harmful to the human body. Therefore development of lead free material is required. Lead free brasses containing silicon system intermetallic compound were cast and were examined machinability. The results were as follows. Lead free brasses as Cu-Zn-Mg-Si alloy and Cu-Zn-Mg-Si-Mn alloy were cast. The intermetallic compound of Cu5Mg2Si formed in Cu-Zn-Mg-Si alloy during solidification and after solidification. Beta phase fraction in matrix structure increase with addition of Mg and Si. The quantity of the compound increase with increasing contents of Mg and Si. Form of the compound became like eutectic structure when Mg and Si contents were too much. Because of addition of Mg and Si to brass, chip size became small and hardness increased. Chips curl up in small pieces. When copper content increase, alpha phase fraction increased and intermetallic compound of Cu5Mg2Si was distributed on boundary of alpha and beta phase. Furthermore, eutectic structure did not form even if contents of Mg and Si were much. In this case, chip size became more small and the hardness decrease.When manganese was added to Cu-Zn-Mg-Si alloy, Mn5Si3 formed. The compound uniformly dispersed. Chip size of Cu-Zn-Mg-Si-Mn alloy was smaller than that of Cu-Zn-Mg-Si alloy.

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  • Sliding properties of composite sprayed coating between bronze powder and solid lubricant

    T Kobayashi, T Maruyama, T Yasuda

    MATERIALS TRANSACTIONS   44 ( 5 )   1024 - 1028   2003.5

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    Intake of lead is harmful to the human body. Therefore, it is necessary to substitute other alloying elements for lead in Cu alloys. Using a Cu-9.5 mass%Sn alloy powder and CaF2, which has sliding properties equal to lead, a composite sprayed coating (by flame spraying) was developed. The results were as follows. A composite sprayed coating with the desired characteristics was successfully produced. The area fraction of the CaF2 layer in the composite coating increased with the increase in the blend ratio of CaF2 in the blended powder. The wear resistance of the composite coating containing CaF2 was excellent. As a result it was determined that CaF2 in the composite coating was effective as a sliding material substitute for lead.

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  • Carbon pickup phenomenon of Fe-C system alloys in the evaporative pattern casting process Reviewed

    MARUYAMA Toru, Kobayashi Takeshi

    Journal of Japan Foundry Engineering Society   第75巻,2号,130-136頁   233 - 239   2003.2

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    Language:Japanese   Publisher:Kansai University  

    The Carbon pickup phenomenon in the evaporative pattern casting process was investigated using hypoeutectic cast iron, spheroidal graphite cast iron, cast steel and high chromium cast iron as the Fe-C system alloys. The carbon pickup phenomenon occurred due to the thermal decomposition products in the front of the melt flow. When the distance of the melt flowed was 100 mm, the carbon pickup ratio of hypoeutectic cast iron and high chromium cast iron showed almost the maximum value. The carbon pickup ratio rises, as it is smaller for the carbon equivalent of molten cast iron. In particular, the carbon pickup ratio in the cast steel was remarkably high. Conversely, in the molten spheroidal graphite cast iron with the hypereutectic composition the carbon pickup phenomenon did not occur. The carbon pickup ratio increased with an increase in the blended ratio of EPS in the foamed pattern on the hypoeutectic cast iron.

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  • Surface conditions of substrate and adhesive property of sprayed coating Reviewed

    MARUYAMA Toru, Takeshi Kobayashi

    Journal of Japan Thermal Spraying Society   第39巻,4号,144-149頁 ( 4 )   144 - 149   2002.10

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    Though the adhesion between substrate and sprayed coating seems to be mainly due to the anchoring effect, quantitative examinations have not been sufficient. In this paper, the surface condition of a roughened substrate is quantitatively evaluated using a surface roughness tester, and the adhesive relationship is clarified. Substrate used was S45C carbon steel, and the roughening methods were blasting and endless belt polishing with alumina grit, in various roughening conditions. A pure copper coating was formed using the powder flame spraying method on roughened substrate. The drawing adhesion strength test method was used to evaluate the adhesive properties. The adhesive strength is reduced, though the surface roughness of the substrate increases, as the size of the grid particles for roughening increase. The alumina grits remained on the substrate after roughening, and they were removed by ultrasonic cleaning. Though there is no relation between the adhesive strength and the ratio of the increase in the surface area of substrate due to the roughening treatment, it is recognized that the adhesive strength also increases when the roughness gradient of the substrate increases.

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  • Effects of carbon and ferrite-stabilizing elements on austenite grain formation for hypo-peritectic carbon steel

    T Maruyama, M Kudoh, Y Itoh

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   86 ( 2 )   86 - 91   2000.2

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:IRON STEEL INST JAPAN KEIDANREN KAIKAN  

    In order to investigate the formation process from delta dendrite to gamma grain in a hypo-peritectic carbon steel, an unidirectionally solidifying carbon steel sample is quenched from a temperature above the solidus temperature. Three zones of primary dendrite, fine columnar grain and coarse columnar grain are observed in the sample. The dendritic zone consists of (L+delta) phase, the fine columnar grain is both phases of (L+delta+gamma) and (delta+gamma), and the coarse columnar grain is gamma phase. The width of the fine columnar grain agrees with the primary arm spacing of the 6 dendrite and it is the same result as that for a hyper-peritectic carbon steel. The gamma grain boundary in the zone of the fine columnar grain forms at the skeleton of the 6 dendrite, while that for a hyper-peritectic carbon steel forms at the position between the 6 dendrites. Since transition from the fine columnar grain to the coarse one occurs immediately after the disappearance of 6 phase, the 6 phase prevents the coarsening of the fine columnar grain. A length of the zone of the fine columnar grain decreases with increasing carbon concentration. The length extends according to the addition of ferrite-stabilizing elements. The extended effect becomes stronger in the sequence of Nb&gt;V&gt;Mo, while Ni as an austenite-stabilizing element have no influence on the length.

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  • Formation of austenite grain in hypo-peritectic carbon steels

    M Kudoh, T Maruyama, Y Ito

    SECOND INTERNATIONAL CONFERENCE ON PROCESSING MATERIALS FOR PROPERTIES   Page.635-638 (2000)   635 - 638   2000

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    Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:MINERALS, METALS & MATERIALS SOC  

    When hypo-peritectic carbon steel is quenched during unidirectional solidification, the region of fine columnar grain is observed. It is classified into two coexisting phases. One is coexisting phases of liquid, delta and gamma in the upper part of the region, and the other is coexisting phases of delta and gamma in the lower part of the region. To form the coexisting part of the three phases means that solidification in this experiment proceeds in non-equilibrium state. The size of the narrow side of one fine columnar grain coincides with the arm spacing of a primary dendrite and this result is the same as the hyper-peritectic carbon steel. However, the boundary of the fine grain in the hypo-peritectic carbon steel is formed in different location from that of the hyper-peritectic carbon steel. The former is formed in the skeleton of the dendrite, while the latter is formed in the interspacing of the dendrite. The region of the fine grain changes suddenly to that of the coarse grain when the delta phase in the coexisting part of two phases disappears completely. Therefore, the delta phase in the hypo-peritectic carbon steel might prevent the growth of gamma grain. In order to recognize it, ferrite formers such as Mo, V and Ni are added in the sample. Then, the longitudinal length of the fine columnar grain extends in the sequence of the no addition, Mo, V and Nb.

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  • Peritectic transformation and austenite grain formation for hyper-peritectic carbon steel

    T Maruyama, K Matsuura, M Kudoh, Y Itoh

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   85 ( 8 )   585 - 591   1999.8

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:IRON STEEL INST JAPAN KEIDANREN KAIKAN  

    Three binds of solidifying regions, (L+delta), (L+delta+gamma) and (L+ gamma) have been observed in an unidirectional solidified hyper-peritectic steel sample quenched from a temperature above the solidus temperature. The primary delta phase in the (L+delta) region solidifies to a dendritic structure, and the fine columnar gamma grains are exist in the boundary part of the (L+gamma) region near to the (L+delta+gamma). The columnar shape of the fine gamma grains is caused by the shape of delta-dendrite. A transition from the fine gamma grains to coarse columnar gamma grains occurs in the (L+gamma) region when a volume fraction of liquid lowers. The structure of coarse columnar gamma grain have no relation with dendrite structure. The fine columnar gamma grains disappear as a result of growth of coarse columnar gamma grain. The measured temperature ranges for the (L+delta+gamma) region agree with those calculated under a non-equilibrium condition. The end temperatures of peritectic reaction and solidification calculated are somewhat lower than the equilibrium temperatures, and are independent of solidification rate.

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  • Evaporation rate of copper from molten iron by urea spraying under reduced pressure

    T Maruyama, HG Katayama, T Momono, Y Tayu, T Takenouchi

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   84 ( 4 )   243 - 248   1998.4

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    Experiments were done by spraying urea (NH2CONH2) as its pyrolysis gases at the intervals of 5min onto molten iron containing 0.4 mass% Cu at 1600 degrees C under reduced pressure. Ii urea amount per each spraying was more than 0.4g, the molten iron was suddenly splashed and slopped over the top of crucible during the experimental run, so that 0.3g of urea was sprayed in the subsequent experiments. Nitrogen concentration of the molten iron increased with increasing the number of urea spraying and the pressure of gas phase. It was 5 to 8 times higher than the concentration in equilibrium with nitrogen gas.
    The following relationships were found between the rate constant (k) of copper evaporation and the pressure (P in Pa) :In the case of urea spraying, log k = -log P - 0.762; without urea spraying, log k = -log P - 0.996. These results show that even in the case of urea spraying the evaporation rate of copper was controlled by mass transfer through gaseous film on the surface of the molten iron. It was concluded that acceleration of copper evaporation by urea spraying may be mainly due to the evaporation as Cu(N-3)(2) which has higher vapor pressure than metallic copper.
    The evaporation rate of copper somewhat decreased in the case of the molten iron containing 0.33 mass% C, because some part of urea was probably consumed by the formation of iron cyanide. Sulfur had little influence on the evaporation rate.

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  • Accelerative evaporation mechanism of molten pure copper and high carbon iron by urea addition

    T Maruyama, HG Katayama, T Momono

    TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN   84 ( 2 )   91 - 96   1998.2

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    In order to obtain the fundamental information concerning accelerative evaporation of copper dissolved in molten steel with ammoniacal compound, experiments were done by adding urea onto molten pure copper and high carbon iron containing 0.4% Cu at 1150 to 1450 degrees C under an argon atmosphere.
    Evaporated amount of the molten copper increased with the increase of urea amount. At constant urea amount, it increased with increasing temperature at 1150 to 1250 degrees C, while it became constant above 1250 degrees C. Based on the mass balance of evaporated copper to added urea, it was concluded that the molten copper was evaporated as Cu(N-3)(2) and this compound decomposed to liberate copper immediately after evaporation.
    In the case of high carbon iron containing 0.4% Cu, iron was preferentially evaporated, so that copper was concentrated in the molten iron. At constant urea amount, evaporated amount of the molten iron increased abruptly with increasing temperature up to 1250 degrees C, while it reached almost constant value at 1250 to 1300 degrees C. After again increasing at 1300 to 1350 degrees C, it remained unchanged above 1350 degrees C. X-ray diffraction analysis showed that the matter entrapped from exhaust gas was composed of graphite, Fe3C and Fe3N. Based on this result and the mass balance, it was concluded that the high carbon iron was evaporated as Fe(CN), below 1300 degrees C and Fe(CN)(2) above 1350 degrees C.

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Books

  • Technical Review on Special Molding System for Energy Saving and Environmental Conservation Reviewed

    NAGAI, Yasuhiro, MINOWA, Koizou, MARUYAMA,Toru( Role: Joint author)

    Journal of Japan Foundry Engineering Society  2021.9 

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  • Blasting Treatment Reviewed

    MARUYAMA,Toru( Role: Sole author)

    2021.4 

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  • High-entropy Steel and High-entropy Cast Iron Reviewed

    TAKESHI, Nagase, MARUYAMA,Toru( Role: Joint author)

    Bulletin of The Iro and Steel Institute of Japan  2020.4 

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  • 「球状黒鉛鋳鉄の核生成と黒鉛球状化理論」球状黒鉛鋳鉄の核生成及び黒鉛成長の熱力学的考察

    丸山 徹( Role: Sole author)

    鋳造工学  2018.10 

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  • 特殊鋳型システムと環境適応化に関する技術動向

    黒川 豊, 簑輪 幸三, 丸山 徹( Role: Joint author)

    鋳造工学  2018.8 

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  • 「鋳造要素技術概論」2.鋳鉄の鋳造要素技術概論 鋳鉄の熱処理及び変形と歪み

    菅野利猛, 丸山 徹( Role: Joint author)

    鋳造工学  2017.11 

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  • 「鋳造要素技術概論」2.鋳鉄の鋳造要素技術概論 鋳鉄の基地組織制御

    平塚貞人, 麻生節夫, 丸山 徹( Role: Joint author)

    鋳造工学  2017.10 

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  • Tribology of Lead-Free Copper Alloy Castings

    MARUYAMA,Toru( Role: Joint author)

    2017.8 

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  • 知っておきたい溶射、ものづくりに役立つ周辺技術 亜鉛合金溶射皮膜の密着性が向上するブラスト条件

    丸山 徹( Role: Sole author)

    溶射技術  2015.9 

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    溶射皮膜の密着性向上のために行う前処理には,一般的にブラスト処理が行われる。しかし,どのようなブラスト条件によって密着性が高くなる基材表面粗さが得られるかについての報告は少ない。そこで本研究では,ブラスト加工条件(ブラスト時間,グリッドサイズなど)を変化させた時の基材表面粗さのパラメータを求め,みがき帯鋼(S45C)基材表面へZn‐15%Al合金を溶射し,形成した溶射皮膜の密着性を押剥がし密着試験装置で評価して,効果的な粗面化条件を検討した。得られた結果を以下に示した。1)ブラスト加工によって粗面化された基材表面粗さの凹凸平均ピーク幅Pw(μm)と十点平均粗さRzjisの比が小さくなると密着性は向上する。2)グリッドサイズが小さくなるほどPw/Rzjisの値は小さくなる。3)ブラスト時間が長くなるほどPw/Rzjisの値は小さくなる傾向が見られた。

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  • Surface State of Substrate and Adhesion of Thermal Sprayed Coatings

    ( Role: Joint author)

    2011.8 

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  • 「非鉄鋳物の動向」-鉛フリー青銅鋳物-

    小林 武, 丸山 徹( Role: Joint author)

    鋳造ジャーナル  2009.7 

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  • 模型の熱分解ガス圧測定

    丸山 徹( Role: Joint author)

    産学連携鋳造中核人材育成事業 専門職大学院インターンシップ・クリーンファンドリ-・工程数の削減を具備した消失模型鋳造  2008 

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  • 模型・溶湯の置換

    丸山 徹( Role: Sole author)

    産学連携中核人材育成事業 鋳造現場の中核人材育成プロジェクト近畿拠点 EPC講座  2005 

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  • 鉛フリー鋳物銅合金

    小林武, 丸山徹( Role: Joint author)

    まてりあ  2004.8 

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  • 基礎からの機械・金属材料

    斉藤栄, 戸部省吾, 丸山徹( Role: Joint author)

    基礎からの機械・金属材料  2004.4 

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  • コールドスプレーは熱い!?

    丸山 徹( Role: Sole author)

    工学と技術  2003.11 

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MISC

  • 基材表面の性質と溶射皮膜の密着性

    丸山 徹, 小林 武

    溶接技術 : 社団法人日本溶接協会誌   60 ( 2 )   79 - 82   2012.2

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    Language:Japanese   Publisher:産報出版  

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  • 非鉄鋳物の動向--鉛フリー青銅鋳物

    小林 武, 丸山 徹

    鋳造ジャーナル   5 ( 7 )   2708 - 2712   2009.7

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    Language:Japanese   Publisher:日本鋳造協会  

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  • 「テーラーメイド材料開発」について講演

    小林武, 丸山徹

    2006.12

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  • 環境対応型非鉄金属鋳造技術に関する研究開発/高耐焼付性低鉛・鉛フリー軸受銅合金の開発(委託者:社団法人日本非鉄金属鋳物協会)

    小林 武, 丸山 徹

    2006.12

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  • 硫化物を分散させた鉛フリー青銅の開発

    丸山 徹

    2006

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  • 工程数を削減し、環境に優しい消失模型鋳造法

    小林 武, 丸山 徹

    技苑   119   26 - 26   2004.9

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    Language:Japanese   Publisher:関西大学  

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  • Siを添加した鉛入り銅合金における鉛の分離挙動

    丸山 徹, 小林 武

    技苑   119   8 - 8   2004.9

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    Language:Japanese   Publisher:関西大学  

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  • アシキュラ鋳鉄の組織に及ぼす冷却速度の影響

    丸山 徹, 小林 武

    鋳物 : 講演大会講演概要集   139   127 - 127   2001.10

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  • 環境適応型鋳造法としての消失模型鋳造法に関する研究 (産学連携への掛け橋)

    小林 武, 丸山 徹

    技苑   104   4 - 5   2000.8

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Presentations

  • Space Saving for Water Meter by Development of Manufacturing Technology of Lead-Free Bronze Castings

    MATSUBAYASHI, Masaki, SIMOMI, Masaaki, MATSUBAYASHI, Ryozo, MARUYAMA,Toru, YASUDA, Yoshinobu

    Japan Foundry Engineering Society  2020.5 

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    Event date: 2020.5

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  • 耐極限環境ハイエントロピー合金

    丸山 徹, 永瀬 丈嗣, 西本 明生, 星山 康洋

    関西大学先端科学技術推進機構  2020.3 

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    Event date: 2020.3

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  • 耐極限環境ハイエントロピー合金

    丸山 徹, 西本 明生, 星山 康洋, 永瀬 丈嗣

    関西大学先端科学技術推進機構  2019.3 

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    Event date: 2019.3

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  • 耐極限環境ハイエントロピー合金

    丸山 徹, 西本 明生, 星山 康洋, 永瀬 丈嗣

    関西大学先端科学技術推進機構  2018.3 

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    Event date: 2018.3

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  • 鋳鉄の黒鉛球状化処理におけるマグネシウム歩留りに及ぼす球状化剤中の酸素量及び球状化反応の影響

    若林 昂佑, 白崎 敦士, 丸山 徹, 尾鼻 美規, 浜端 良輔

    日本鋳造工学会  2017.10 

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    Event date: 2017.10

    Venue:秋田市  

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  • 鋳鉄の基礎組織と凝固・冷却履歴の関係

    牧野 啄也, 丸山 徹, 小西 邦彦, 米田 博幸, 中江 秀雄

    日本鋳造工学会  2017.10 

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    Event date: 2017.10

    Venue:秋田市  

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  • 鋳鉄の黒鉛組織に及ぼす溶湯と共存する酸化物及び硫黄の影響

    渡辺 健太, 丸山 徹

    日本鋳造工学会  2017.10 

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    Event date: 2017.10

    Venue:秋田市  

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  • シェル鋳型と鋳鉄溶湯の焼付き性に及ぼす溶湯中の炭素,硫黄の影響

    廣野 守, 中岡 将太, 丸山 徹, 玉置 充快, 石川 知哉, 松本 拓也, 藤城 孝宏, 荻野 知也, 三木 聡, 田中 良樹, 小楠 竜也

    日本鋳造工学会  2017.10 

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    Event date: 2017.10

    Venue:秋田市  

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  • 鋳鉄の高温酸化に及ぼす基地組織の影響

    齋藤 隆太, 丸山 徹, 中本 光二, 山下 莉歩, 堺 貴洋

    日本鋳造工学会  2017.10 

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    Event date: 2017.10

    Venue:秋田市  

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  • 鋳鉄の黒鉛球状化剤の急速加熱による融解時の相変態挙動

    白崎 敦士, 若林 昂佑, 丸山 徹, 尾鼻 美規, 浜端 良輔

    日本鋳造工学会  2017.10 

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    Event date: 2017.10

    Venue:秋田市  

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  • CrMnFeCoNi系ハイエントロピー合金の硬さに影響を及ぼす冷却速度と熱処理の影響

    高島 和樹, 丸山 徹, 永瀬 丈嗣

    日本鋳造工学会  2017.9 

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    Event date: 2017.9

    Venue:秋田市  

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  • 消失模型鋳造における系内ガス置換を施した発泡模型を用いた鋳鉄の湯流れ挙動

    下薄 拓実, 南 彬, 丸山 徹

    日本鋳造工学会  2017.9 

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    Venue:秋田市  

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  • 硫化物を分散させた鉛フリー青銅鋳物の生型鋳造における鋳型内の温度・ガス圧の経時変化

    近藤 克哉, 丸山 徹, 川瀬 博光, 松林 正樹, 曽根 孝明

    日本鋳造工学会  2017.9 

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    Event date: 2017.9

    Venue:秋田市  

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  • 硫化物分散型PbフリーCu合金CAC411の水道水中での腐食挙動

    安田 吉伸, 阿部 弘幸, 丸山 徹, 春名 匠

    日本水道協会  2017.9 

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  • 隙間噴流試験による硫化物分散型鉛フリー銅合金の耐エロージョン・コロージョン性の評価

    安田 吉伸, 水谷 直弘, 阿部 弘幸, 松林 良蔵, 丸山 徹, 春名 匠

    日本防錆技術協会  2017.6 

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    Event date: 2017.6

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  • 球状黒鉛鋳鉄の黒鉛粒数に及ぼすテルルとマグネシウムの影響

    仲村 利樹, 齋藤 隆太, 丸山 徹, 柳谷 仁志, 堺 貴洋, 中本 光二

    日本鋳造工学会 第168回全国講演大会, 日本鋳造協会 平成28年度秋季大会  2016.9 

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    Event date: 2016.9

    Venue:高知市文化プラザ かるぽーと  

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  • AlCoCrFeNi2.1ハイエントロピー合金の凝固組織と構成相

    永瀬 丈嗣, 武村 守, 松室 光昭, 丸山 徹

    公益社団法人 日本鋳造工学会、一般社団法人 日本鋳造協会  2016.9 

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    Event date: 2016.9

    Venue:高知市文化プラザ かるぽーと  

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  • シェル鋳型と鋳鉄溶湯との焼付き性に及ぼす溶湯圧力の影響

    中岡 将太, 廣野 守, 丸山 徹, 石川 知哉, 松本 拓也, 藤城 孝宏, 荻野 知也, 三木 聡, 田中 良樹, 小楠 竜也

    公益社団法人 日本鋳造工学会、一般社団法人 日本鋳造協会  2016.9 

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    Event date: 2016.9

    Venue:高知市文化プラザ かるぽーと  

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  • 消失模型鋳造の溶湯充填初期における湯流れ速度低下と熱分解液化成分及びガス圧の関係

    下薄 拓実, 中村 啓介, 丸山 徹

    日本鋳造工学会  2016.9 

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    Event date: 2016.9

    Venue:高知市文化プラザ かるぽーと  

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  • Effect of aluminum and suspended products in cast iron melt on graphite nodule count in spheroidal graphite cast iron

    Toru Maruyama

    The 6th Korea-Japan Conference for young Foundry Engineers  2016.8 

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    Event date: 2016.8

    Venue:Korea Aerospace University Goyang, Korea (韓国,高陽市 )  

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  • Microstructures of the ingots in AlCoCrFeNi2.1 eutectic high entropy alloys (EHEAs) ingot prepared by metal mold casting

    Takeshi Nagase, Mamoru Takemura, Mitsuaki Matsumuro, Toru Maruyama

    Committee of the 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9)  2016.8 

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    Event date: 2016.8

    Venue:Kyoto, Japan  

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  • Corrosion properties of lead free bronze casting 'CAC411' by measurement of polarization curves

    Yoshinobu Yasuda, Hiroyuki Abe, Toru Maruyama, Takumi Haruna

    Committee of the 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9)  2016.8 

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    Event date: 2016.8

    Venue:Kyoto, Japan  

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  • Effect of coating thickness on Melt Filling Rate of Cast Iron in Evaporative Pattern Casting Process

    Toru Maruyama, Gou Nakamura, Mitsuyoshi Tamaki, Keisuke Nakamura

    World Foundry Organization  2016.5 

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    Event date: 2016.5

    Venue:Nagoya, Japan  

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  • Influence of phosphorus on the solidification temperature of nickel-base self-fluxing alloy

    Masaaki Inazumi, Toru Maruyama, Keiji Nakai, Yasushi Kitamura

    Committee of 24th International Symposium on Processing and Fabrication of Advanced Materials (PFAM 24)  2015.12 

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    Event date: 2015.12

    Venue:Suita, Japan  

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  • Influence of phosphorus on the solidification temperature of nickel-base self-fluxing alloy

    2015.11 

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    Event date: 2015.11

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  • Corrosion resistance of Zn-Ti pseudo alloy spraying

    2015.11 

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    Event date: 2015.11

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  • Cu-Zn-Ni合金の色調及び機械的性質

    久米井隆成, 福山貴博, 吉村泰治, 木戸康太, 丸山徹

    日本銅学会  2015.11 

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    Event date: 2015.11

    Venue:大阪大学(吹田市)  

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  • Effect of Melting Condition on Fluidity of Lead Free Sulfide Bronze

    Toru Maruyama, Hiroyuki Abe, Ryozo Matsubayashi, Masakazu Teramura, Takeshi Kobayashi

    Committee of Asian Foundry Congress  2015.10 

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    Event date: 2015.10

    Venue:Hanoi, Vietnam  

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  • 炭素鋼鋳鋼の強度に及ぼす初析フェライト及びパーライト組織の影響

    丸山 徹, 東 孝裕, 西田 秀麿, 吉迫 竜也, 山田 亮介, 山田 修, 木下 英彦

    日本鋳造工学会  2015.10 

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    Event date: 2015.10

    Venue:室蘭工業大学  

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  • ビスマス青銅の固液共存状態における粘弾性構成の構築と金型鋳造における凝固割れの予測の試み

    丸山 徹, 松下 彬, 中澤 智顕, 吉田 誠, 明石 巌, 明石 隆史, 吉田 亮子, 岡根 利光, 山下 庄平, 森 拓樹, 小舘 貞治

    日本鋳造工学会  2015.10 

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    Event date: 2015.10

    Venue:室蘭工業大学  

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  • 偏晶系合金の耐凝固割れ性に及ぼす偏晶凝固割合の影響

    梅森 達也, 吉田 亮子, 丸山 徹

    日本鋳造工学会  2015.10 

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    Event date: 2015.10

    Venue:室蘭工業大学  

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  • 消失模型鋳造における黒褐色液化樹脂の生成に及ぼす溶湯温度の影響

    丸山 徹, 中村 啓介, 中村 豪

    日本鋳造工学会  2015.10 

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    Event date: 2015.10

    Venue:室蘭工業大学  

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  • 硫化物分散型鉛フリー銅合金CAC411中の硫化物が及ぼすめっきへの影響

    安田吉伸, 阿部弘幸, 吉居久光, 小寺善人, 松林良蔵, 春名匠, 丸山徹

    表面技術協会  2015.9 

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    Event date: 2015.9

    Venue:信州大学(松本市)  

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  • Effect of Alloying Elements on Monotectic Com-position of Lead Free Bronze with Dispersed Sulfide Particles

    Toru Maruyama, Hiroyuki Abe, Ryozo Matsubayashi, Masakazu Teramura, Takeshi Kobayashi

    GDMB Society of Metallurgists and Miners  2015.6 

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    Event date: 2015.6

    Venue:Düsseldorf, Germany  

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  • 炭素鋼鋳鋼のα結晶粒組織に及ぼすバナジウムと窒素の影響

    丸山 徹, 西田 秀麿, 東 孝裕, 吉迫 竜也, 山田 修, 木下 英彦

    鋳造工学会  2015.5 

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    Event date: 2015.5

    Venue:早稲田大学  

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  • 硫化物を分散させた鉛フリー青銅鋳物CAC411の諸特性に及ぼすりん量の影響

    丸山 徹, 阿部 弘幸, 松林 良蔵, 寺村 正和, 小林 武

    日本鋳造工学会  2015.5 

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    Event date: 2015.5

    Venue:早稲田大学  

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  • Cu-S合金の凝固割れ性に及ぼす硫黄量の影響

    丸山 徹, 上田 広大, 梅森 達也, 吉田 亮子

    日本鋳造工学会  2015.5 

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    Event date: 2015.5

    Venue:早稲田大学  

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  • 産学官連携の実践を振り返って

    丸山 徹

    関西大学先端科学技術推進機構  2015.1 

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    Event date: 2015.1

    Venue:Kansai University  

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  • マグネシウム珪酸塩を硬化剤とした無機自硬性鋳型の硬化速度に及ぼす水ガラスのモル比の影響

    丸山 徹, 内田 啓太, 小楠 竜也, 易 宏治, 小林 武

    日本鋳造協会  2014.10 

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    Event date: 2014.10

    Venue:北九州国際会議場  

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  • 亜鉛合金溶射皮膜の密着性に及ぼすブラスト加工条件の影響

    丸山 徹, 廣畑 充弘

    日本溶射学会  2014.6 

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    Event date: 2014.6

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  • 鋳鉄の消失模型鋳造における模型分解と溶湯充填の直接観察

    丸山 徹, 中村 豪, 玉置 充快

    日本鋳造工学会  2014.6 

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    Event date: 2014.6

    Venue:みやこめっせ(京都市勧業館)  

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  • Al-In合金の凝固割れ性に及ぼすインジウム量の影響

    丸山 徹, 梅森 達也, 吉田 亮子

    日本鋳造工学会  2014.6 

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    Event date: 2014.6

    Venue:みやこめっせ(京都市勧業館)  

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  • 低硫黄鋳鉄の黒鉛組織に及ぼすアルミニウムの影響

    丸山 徹, 井上 史弥

    日本鋳造工学会  2014.6 

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    Event date: 2014.6

    Venue:みやこめっせ(京都市勧業館)  

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  • Cu-Zn-Ni-Mn系合金の硬さに及ぼす溶体化・時効熱処理温度の影響

    丸山 徹, 山崎 勝, 黒瀬 一人, 萩原 光一

    日本銅学会第53回講演大会講演概要集  2013.11 

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    Event date: 2013.11

    Venue:吹田  

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  • 硫化物分散型鉛フリー青銅の腐食に及ぼす電位の影響

    丸山 徹, 春名 匠, 織田 大輝, 小林 武

    日本銅学会  2013.11 

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    Event date: 2013.11

    Venue:関西大学 千里山キャンパス  

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  • 熱間押出し法による黄銅切削屑からのMnS添加鉛フリー快削黄銅の調製

    佐藤 直樹, 竹田 諒佑, 西本 明, 丸山 徹

    日本銅学会第53回講演大会講演概要集  2013.11 

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    Event date: 2013.11

    Venue:吹田  

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  • 特別講演Ⅱ:【現在】球状硫化物を分散させた鉛フリー青銅の開発

    丸山 徹, 小林 武

    日本銅学会  2013.11 

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    Event date: 2013.11

    Venue:関西大学 千里山キャンパス  

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  • 鋳鉄の黒鉛形態に及ぼす酸素量と硫黄量の影響

    井上 史弥, 丸山 徹

    平成25年度秋季支部講演大会講演概要  2013.11 

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    Event date: 2013.11

    Venue:吹田  

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  • 消失模型鋳造におけるEPS分解生成物の組成に及ぼす溶湯温度の影響

    玉置充快, 中村 豪, 丸山 徹

    第163回全国講演大会講演概要集  2013.10 

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    Event date: 2013.10

    Venue:高岡  

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  • 球状黒鉛鋳鉄の耐高温酸化性に及ぼすAl,Cr及びWの複合添加の影響

    近藤 享平, 丸山 徹, 山口 泰文

    第163回全国講演大会講演概要集  2013.10 

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    Event date: 2013.10

    Venue:高岡  

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  • 天然由来物を粘結剤とした水蒸気利用造型法における加熱条件の最適化

    伊與田 浩志, 小倉 達士, 西村 俊成, 井出 勇, 西田 伸司, 丸山 徹

    第163回全国講演大会講演概要集  2013.10 

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    Event date: 2013.10

    Venue:高岡  

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  • 天然由来物を粘結剤とした鋳型の砂焼付き性

    丸山 徹, 村本 祐麿, 伊與田 浩志, 井出 勇, 西田 伸司

    第163回全国講演大会講演概要集  2013.10 

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    Event date: 2013.10

    Venue:高岡  

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  • 消失模型鋳造における溶湯充填速度に及ぼす塗型層厚さと通気度の影響

    中村 豪, 玉置充快, 丸山 徹

    第163回全国講演大会講演概要集  2013.10 

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    Event date: 2013.10

    Venue:高岡  

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  • 炭素鋼鋳鋼品の結晶粒組織に及ぼすTi, V, Nbの複合添加の影響

    田中 宏城, 中村 卓, 丸山 徹, 山田 亮介, 木下 英彦

    第163回全国講演大会講演概要集  2013.10 

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    Event date: 2013.10

    Venue:高岡  

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  • FEMによる流動凝固・熱応力解析を用いた青銅金型鋳造における割れ予測の試み

    中澤 智顕, 吉田 誠, 明石 巌(明石合銅), 明石 隆史, 吉田 亮子, 丸山 徹, 岡根 利光, 山下 庄平, 森 拓樹, 小舘 貞治

    第163回全国講演大会講演概要集  2013.10 

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    Event date: 2013.10

    Venue:高岡  

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  • 硫化物を分散させた鉛フリー青銅の硫化物形態に及ぼす溶湯成分の影響

    丸山 徹, 吉田 亮子, 阿部 弘幸, 松林 良蔵, 寺村 正和, 小林 武

    第163回全国講演大会講演概要集  2013.10 

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    Event date: 2013.10

    Venue:高岡  

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  • 硫化物を分散させた鉛フリー青銅鋳物の砂焼付き性

    丸山 徹, 村本 祐麿, 阿部 弘幸, 松林 良蔵, 寺村 正和, 小林 武

    第163回全国講演大会講演概要集  2013.10 

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    Event date: 2013.10

    Venue:高岡  

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  • 青銅金型鋳造の凝固割れ性に及ぼす鋳造条件と抜型時間の影響

    吉田 亮子, 丸山 徹, 吉田 誠, 明石 巌(明石合銅), 明石 隆史, 岡根 利光, 山下 庄平, 森 拓樹, 小舘 貞治

    第163回全国講演大会講演概要集  2013.10 

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    Event date: 2013.10

    Venue:高岡  

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  • Effect of chemical composition on spheroidizing of sulfide in lead free bronze with dispersed sulfide particles

    Toru Maruyama, Ryoko Yoshida, Hiroyuki Abe, Ryozo Matsubayashi, Masakazu Teramura, Takeshi Kobayashi

    The 4th Korea-Japan Conference for Young Foundry Engineers  2013.9 

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    Event date: 2013.9

    Venue:Muroran  

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  • Effect of melt temperature on formation of liquefied resin produced by thermal decomposition during evaporative pattern casting

    Mitsuyoshi Tamaki, Gou Nakamura, Toru Maruyama

    The 8th International Symposium in Science & Technology  2013.8 

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    Event date: 2013.8

    Venue:Suita  

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  • Effect of coating permeability and coating thickness on melt flow rate in evaporative pattern casting

    Gou Nakamura, Mitsuyoshi Tamaki, Toru Maruyama

    The 8th International Symposium in Science & Technology  2013.8 

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    Event date: 2013.8

    Venue:Suita  

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  • The effect of cooling rate on dendrite arm spacing of the lead free bronze with dispersed sulfide particles

    Toru Maruyama, Kyohei Kondo, Ryoko Yoshida

    8th Pacific Rim International Congress on Advanced Materials and Processing  2013.8 

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  • Effect of Monotectic Reaction on Solidification Cracking Resistance of Lead Free Bronze

    Ryoko Yoshida, Toru Maruyama, Toshihide Takenaka

    8th Pacific Rim International Congress on Advanced Materials and Processing  2013.8 

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  • 球状黒鉛鋳鉄の黒鉛粒数に及ぼすカルシウム及びアルミニウムの影響

    丸山 徹, 中村吉宏, 小林 武

    第162回全国講演大会講演概要集  2013.5 

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    Event date: 2013.5

    Venue:甲府  

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  • 亜共晶片状黒鉛鋳鉄の耐高温酸化性に及ぼすAl,Ti及びSi/C比の影響

    丸山 徹, 辻江健太, 小林 武

    第162回全国講演大会講演概要集  2013.5 

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    Event date: 2013.5

    Venue:甲府  

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  • マグネシウム珪酸塩を硬化剤とした無機自硬性鋳型の強度に及ぼす水ガラスのモル比の影響

    丸山 徹, 坂井 夏希, 内田 啓太, 小楠 竜也, 易 宏治, 小林 武

    第162回全国講演大会講演概要集  2013.5 

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    Event date: 2013.5

    Venue:甲府  

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  • コロイダルシリカを用いたアルミナ系複合酸化物コーディングのき裂発生に及ぼす配合酸化物の影響

    井上 史弥, 丸山 徹

    日本溶射学会関西支部  2012.11 

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    Event date: 2012.11

    Venue:吹田  

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  • 亜鉛合金溶射皮膜の密着強さに及ぼす基材表面の加工硬化の影響

    廣畑 充浩, 丸山 徹

    日本溶射学会関西支部  2012.11 

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    Event date: 2012.11

    Venue:吹田  

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  • 電気的測定法による亜鉛合金溶射皮膜の特性評価の試み

    丸山 徹, 守澤 康之

    日本溶射学会関西支部  2012.11 

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    Event date: 2012.11

    Venue:吹田  

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  • マグネシウム珪酸塩を硬化剤とした無機自硬性鋳型の強度に及ぼす水ガラスのモル比の影響

    坂井 夏希, 丸山 徹

    日本溶射学会関西支部  2012.11 

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    Event date: 2012.11

    Venue:吹田  

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  • 炭素鋼鋳鋼品の熱処理組織に及ぼす微量元素の影響

    中村 卓, 丸山 徹, 山田 亮介, 木下 英彦, 大村 英生

    日本鋳造工学会  2012.10 

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    Event date: 2012.10

    Venue:盛岡  

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  • 金型用鋳鉄の耐酸化性に及ぼすSi/C比およびAl, Ti添加の影響

    辻江健太, 丸山 徹, 小林 武

    日本鋳造工学会  2012.10 

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    Event date: 2012.10

    Venue:盛岡  

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  • 硫化物を分散させたPbフリー銅合金の摺動特性に及ぼす硫化物粒径の影響

    辰巳亮太, 丸山 徹, 小林 武

    日本鋳造工学会  2012.10 

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    Event date: 2012.10

    Venue:盛岡  

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  • 球状黒鉛鋳鉄の黒鉛組織に及ぼすカルシウム化合物の晶出温度の影響

    中村吉宏, 丸山 徹, 小林 武

    日本鋳造工学会  2012.10 

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    Event date: 2012.10

    Venue:盛岡  

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  • Tiを添加した片状黒鉛鋳鉄の黒鉛中の微量元素

    丸山 徹, 辻江健太, 鈴木宏典, 小林 武

    関西鋳造懇話会第2回講演会講演概要集  2012.9 

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    Event date: 2012.9

    Venue:東大阪  

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  • Development of high strength large castings of carbon steel with variety of micro-alloy

    Hiroki Tanaka, Takashi Nakamura, Toru Maruyama

    The 7th International Symposium in Science & Technology  2012.8 

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    Event date: 2012.8

    Venue:Pinang  

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  • The effect of work hardening of substrate surface on adhesion of the zinc alloy sprayed coating

    Mitsuhiro Hirohata, Toru Maruyama

    The 7th International Symposium in Science & Technology  2012.8 

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    Event date: 2012.8

    Venue:Pinang  

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  • The effect of temperature in thermal decomposition gas gap on the melt flow rate in evaporative pattern casting

    Mitsuyoshi Tamaki, Toru Maruyama

    The 7th International Symposium in Science & Technology  2012.8 

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    Event date: 2012.8

    Venue:Pinang  

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  • Development of lead free bronzefor permanent mold casting process

    Toru Maruyama, Takeshi Kobayashi

    The 7th International Symposium in Science & Technology  2012.8 

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    Event date: 2012.8

    Venue:Pinang  

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  • マグネシウム珪酸塩を硬化剤とした無機自硬性鋳型の砂再利用性

    丸山 徹, 水田 善友, 内田 啓太, 小楠 竜也, 易 宏治, 小林 武

    日本鋳造工学会  2012.5 

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    Event date: 2012.5

    Venue:名古屋  

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  • 消失模型鋳造における湯流れ速度に及ぼす熱分解ガス層温度の影響

    玉置充快, 丸山 徹

    日本鋳造工学会  2012.5 

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    Event date: 2012.5

    Venue:名古屋  

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  • 鉛入り銅合金中の溶融鉛の脱融液処理

    丸山 徹, 坂口 竜一, 小林 武

    日本鋳造工学会  2012.5 

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    Event date: 2012.5

    Venue:名古屋  

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  • Tiを添加した片状黒鉛鋳鉄の黒鉛中の微量元素

    丸山 徹, 辻江健太, 鈴木宏典, 小林 武

    日本鋳造工学会  2012.5 

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    Event date: 2012.5

    Venue:名古屋  

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  • 青銅の金型鋳造における凝固割れ形態

    吉田亮子, 丸山 徹, 明石 巌(明石合銅), 明石 隆史(明石合銅), 岡根 利光(産総研), 山下 庄平(Jマテ), 小舘 貞治(リコーキハラ), 森 拓樹(金門製作所), 小林 武(機構研究員)

    日本鋳造工学会  2012.5 

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    Event date: 2012.5

    Venue:名古屋  

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  • Evaluation of Sprayed Coatings by Electrical Method

    Yasuyuki Morisawa (D), Toru Maruyama

    ASM International  2012.5 

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    Event date: 2012.5

    Venue:Houston  

    A method for evaluating the adhesion of metallic thermally sprayed coatings by measuring the electrical resistance of the coating sprayed on a metal substrate was carried out. The thermal sprayed coatings were made of zinc alloy on carbon steel substrates, The electrical resistance levels between the substrates and coatings were evaluated. The electrical resistance increases with increasing measurement time. The larger the rate of increase of the electrical resistance, the lower the adhesive strength. There is a possibility to evaluate qualitatively the adhesion properties.

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  • Adhesion Properties of Sprayed Coatings on Substrate Blasted by Multiangle Blasting

    Toru Maruyama, Takanori Kishita (D)

    ASM International  2012.5 

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    Event date: 2012.5

    Venue:Houston  

    Adhesion properties on the substrate blasted by multi-angle blasting with white alumina grit were examined. The low carbon steel substrates were blasted at two blasting angles (high and low angles) in a multi-angle blasting process. The sprayed coating of zinc alloy was evaluated by an adhesion test. The surface roughness levels after the multi-angle blasting were lower than those in the case of normal blasting. The multi-angle blasting was an effective blasting process to obtain improved adhesive properties. The low blasting angle may have contributed for removing contamination from the substrate surface. The high blasting angle may have contributed for an effective surface roughness to enhance the adhesive properties.

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  • Applicability of Permanent Mold Casting for Lead Free Bronze with Sulfide Dispersion

    Ryoko Yoshida (D), Toru Maruyama, Hiroyuki Abe (N. E. IRC of Shiga Pref.), Ryozo Matsubayashi (Biwalite), Masakazu Teramura (Biwalite), Takeshi Kobayashi (ORDIST)

    World Foundry Organization  2012.4 

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    Event date: 2012.4

    Venue:Monterrey  

    The leaded bronze, the leaded brass the lead free bronze including bismuth the lead free bronze with sulfide dispersion were cast into the permanent mold for the solidification cracking test The applicability of the permanent mold casting process for bronzes was evaluated with comparison of the range of the solidification temperature. The lead free bronze with sulfide dispersion was more unbreakable than the other copper alloys. There are differences the dendrite form near by the fracture and the distribution of residual melts segregated at a part of the end of the solidification. The lead free bronze with sulfide dispersion may have a solidification form being unlikely to crack. The lead free bronze with sulfide dispersion is possible to apply the permanent mold castings process rather than the other copper alloys, and the applicability is almost same as brass castings.

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  • 片状黒鉛鋳鉄中のD型黒鉛の形態に及ぼすTi量の影響

    鈴木 宏典(B), 丸山 徹

    日本鋳造工学会関西支部YFE委員会  2011.12 

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    Event date: 2011.12

    Venue:東大阪  

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  • 消失模型鋳造の溶湯充てん挙動に及ぼす鋳物肉厚と堰位置の影響

    丸山 徹, 宮崎 尚紀(D), 小林 武(機構研究員)

    日本鋳造工学会関西支部  2011.11 

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    Event date: 2011.11

    Venue:東大阪  

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  • Gas Temperature in Thermal Decomposition Gas Gap on Evaporative Pattern Casting

    Toru Maruyama, Takeshi Kobayashi

    Proceedings of the 4th Korea-Japan Conference for Young Foundry Engineers  2011.11 

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    Event date: 2011.11

    Venue:Gyeongju  

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  • Refining Process with Calcium System Flux for Recycle of Stainless

    Yoshinori Manju, Toru Maruyama, Jen-Chou Hsiung

    Koria Foundry Society and Japan Foundry Engineering Society  2011.11 

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    Event date: 2011.11

    Venue:慶州  

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  • マグネシウム珪酸塩を硬化剤とした無機自硬性鋳型の強度に及ぼす脱水割合の影響

    水田 善友(D), 丸山 徹, 内田 啓太(山川産業), 小楠 竜也(山川産業), 易 宏治(山川産業), 小林 武(機構研究員)

    日本鋳造工学会  2011.10 

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    Event date: 2011.10

    Venue:松江  

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  • Cuを添加したフェライト系片状黒鉛鋳鉄の熱膨張・収縮特性

    丸山 徹, 辻江健太(D), 鈴木章史(D), 小林 武(機構研究員)

    日本鋳造工学会  2011.10 

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    Event date: 2011.10

    Venue:松江  

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  • 脱融液処理を応用した鉛入り銅合金からの脱鉛

    坂口 竜一(D), 丸山 徹, 小林 武(機構研究員)

    日本鋳造工学会  2011.10 

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    Event date: 2011.10

    Venue:松江  

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  • 硫化物を分散させた鉛フリー青銅の疲れ特性

    村本 祐麿(D), 丸山 徹, 阿部 弘幸(滋賀県東北部工技), 松林 正樹(マツバヤシ), 寺村 正和(ビワライト), 小林 武(機構研究員)

    日本鋳造工学会  2011.10 

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    Event date: 2011.10

    Venue:松江  

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  • 環境配慮型軸受銅合金鋳物の開発とその金属組織的特徴

    丸山 徹, 舟木 克之, 藤井 要, 岡根 利光, 明石 巌, 小林 武

    日本鋳造工学会  2011.10 

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  • Effect of hardness in blasted substrate surface on adhesive strength of sprayed coatings

    Proceedings of International Thermal Spray conference 2011  2011.9 

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    Event date: 2011.9

    Venue:Hamburg  

    The effect of the hardness in the substrate surface blasted by a grit blasting process on the adhesive strength of Zn-Al sprayed coatings is investigated to find the adhesive strength is improved by work hardening of the substrate surface. The adhesive strength between a substrate of a carbon steel and sprayed coatings of Zn-Al alloy sprayed by a wire flame spraying process is measured. The substrate is roughened by the grit blasting process with white alumina girt in various blasting angles and blasting time. The hardness is measured in around 20 micro-meter depth from the substrate surface. The adhesive strength increases with increasing the hardness even if the surface roughness is almost same. There is the definite correlation between the adhesive strength and the hardness rather than the surface roughness.

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  • JIS化した球状硫化物青銅の特性

    丸山 徹, 小林 武(機構研究員)

    日本鋳造工学会関西支部関西鋳造懇話会  2011.9 

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    Event date: 2011.9

    Venue:東大阪  

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  • 鉛フリー銅合金鋳物「ビワライト」の実用化と普及支援~基礎物性値の測定結果~

    丸山 徹, 所 敏夫, 斧 督人, 阿部 弘幸, 小林 武, 滋賀バルブ協同組合, ビワライト

    滋賀県東北部工業技術センター業務報告書  2011.7 

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    Event date: 2011.7

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  • Lead Free Bronze Castings with Sulfide Dispersion for Water Supply Products

    Newcast Forum  2011.6 

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    Event date: 2011.6 - 2011.7

    Venue:Dusseldorf  

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  • Characteristic of Permanent Mold Casting for Sulfide Dispersed Lead Free Bronze

    Eoropean Metallurgical Conference 2011  2011.6 

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    Event date: 2011.6

    Venue:Dusseldorf  

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  • 溶射皮膜の密着性に及ぼす基材表面硬さの影響

    木下貴章(D), 丸山 徹, 小林 武(機構研究員)

    日本溶射学会  2011.6 

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    Event date: 2011.6

    Venue:大阪  

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  • 溶射皮膜の密着性に及ぼす基材表面硬さの影響

    丸山 徹, 木下 貴章, 小林 武

    日本溶射学会全国講演大会講演論文集  2011.6 

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  • フェライト系片状黒鉛鋳鉄の熱衝撃性に及ぼすCuの影響

    丸山 徹, 辻江健太(D), 鈴木章文(D), 小林 武(機構研究員)

    日本鋳造工学会  2011.5 

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    Event date: 2011.5

    Venue:東京  

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  • オルトケイ酸マグネシウムを硬化剤とした無機自硬性鋳型の硬化特性

    丸山 徹, 爲金貴大(D), 水田善友(D), 小楠竜也(山川産業), 内田啓太(山川産業), 易 宏治(山川産業), 小林 武(機構研究員)

    日本鋳造工学会  2011.5 

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    Event date: 2011.5

    Venue:東京  

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  • 硫化物を分散させた鉛フリー青銅鋳物CAC411の基本特性

    丸山 徹, 吉田亮子(D), 阿部弘幸(滋賀県東北部工業技術センター), 松林良蔵 (ビワライト), 寺村正和 (ビワライト), 小林 武(機構研究員)

    日本鋳造工学会  2011.5 

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    Event date: 2011.5

    Venue:東京  

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  • 硫化物を分散させた鉛フリー青銅の金型鋳造への適応性

    吉田亮子(D), 丸山 徹, 阿部弘幸(滋賀県東北部工業技術センター), 松林良蔵 (ビワライト), 寺村正和 (ビワライト), 小林 武(機構研究員)

    日本鋳造工学会  2011.5 

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    Event date: 2011.5

    Venue:東京  

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  • Alloy Designing and Properties of Sulfide Dispersed Lead Free Bronze Castings

    World Foundry Organization  2010.10 

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    Event date: 2010.10

    Venue:Hangzhou  

    Sulfide was focused on for the substitute substance of lead due to lubricant property of sulfide. The way of dispersion of the sulfide in a matrix had been attempted although sulfide density is too small not to separate from a melt during melting. Some elements are added into copper alloy to decrease sulfur activity for formation of sulfide in copper alloy. Cu-Sn-Zn-S system alloy is cast into sand mold to prepare specimens for investigations of microstructure, casting property, mechanical property and machinability.Sulfide dispersion has been achieved through addition of alloying elements to control sulfur activity in copper melt during solidification. Sulfide formed during solidification after developing primary alpha copper dendrite. The sulfide dispersion was observed in the matrix. The microstructure of the sulfide dispersion was confirmed by optical microscope and SEM. Elemental distribution was also investigated by EDX and WDX. The sulfide is mainly copper sulfide. Few shrinkage cavities were observed as the result of dye penetrant test. Mechanical properties of sand castings were above 195MPa and 15% elongation, which are the required value for conventional bronze castings. Machinability showed almost same as the lead containing castings.

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  • 硫化物を分散させた鉛フリー青銅の金型鋳造特性

    吉田亮子(D), 丸山 徹, 阿部弘幸 (滋賀県東北部工技セ), 松林良蔵 (ビワライト), 寺村正和 (ビワライト), 小林 武 (機構研究員)

    日本鋳造工学会  2010.9 

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    Event date: 2010.9

    Venue:札幌  

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  • 硫化物を分散させた鉛フリー青銅の鋳造組織に及ぼす化物の凝固形態の影響

    松田 亮(D), 吉田亮子(D), 丸山 徹, 松林良蔵 (ビワライト), 寺村正和 (ビワライト), 阿部弘幸 (滋賀県東北部工技セ), 小林 武 (機構研究員)

    日本鋳造工学会  2010.9 

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    Event date: 2010.9

    Venue:札幌  

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  • 硫化物分散型鉛フリー青銅鋳物CAC411がゴム材に与える影響について

    阿部弘幸 (滋賀県東北部工技セ), 土田裕也 (滋賀県東北部工技セ), 丸山 徹, 松林良蔵 (ビワライト), 寺村正和 (ビワライト), 小林 武 (機構研究員)

    日本鋳造工学会  2010.9 

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    Event date: 2010.9

    Venue:札幌  

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  • 鉛フリー銅合金鋳物「ビワライト」の実用化と普及支援-硫黄成分に着目した含鉛青銅の機械的特性-

    阿部弘幸(滋賀県東北部工技セ), 斧督人(滋賀県東北部工技セ), 小林 武(機構研究員), 丸山 徹, 滋賀バルブ協同組合

    滋賀県東北部工業技術センター  2010.6 

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    Event date: 2010.6

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  • Effect of Blasting Angle and Blasting Time on the Amount of Residual Grit blasted on Steel Substrate and Adhesive Property of Sprayed Coating

    International Thermal Spray Conference 2010  2010.5 

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    Event date: 2010.5

    Venue:Singapore  

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  • フッ化カルシウムによるステンレス鋳鋼溶湯からの脱ガス処理

    萬壽良則(D), 水田善友(D), 爲金貴大(D), 丸山 徹, 小林 武(機構研究員)

    日本鋳造工学会  2010.5 

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    Event date: 2010.5

    Venue:東大阪  

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  • 鋳鉄の消失模型鋳造における熱分解残渣の発生過程

    丸山 徹

    日本鋳造工学会  2010.5 

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    Event date: 2010.5

    Venue:東大阪  

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  • オルトケイ酸マグネシウムを硬化剤とした鋳型の耐熱性

    水田善友(D), 丸山 徹, 小林 武(機構研究員), 小楠竜也(山川産業), 易 宏治(山川産業)

    日本鋳造工学会  2010.5 

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    Event date: 2010.5

    Venue:東大阪  

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  • 硫化物分散型鉛フリー銅合金の摩擦・摩耗特性

    丸山 徹, 佐藤知広, 平井良政, 小林武

    日本機会学会関西支部  2010.3 

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    Event date: 2010.3

    Venue:神戸  

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  • ブラスト処理におけるグリットの基材への残留過程

    丸山 徹, 宮崎智也(D), 小林 武

    日本溶射協会  2009.12 

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  • Effect of Blasting Time and Residual Grit on Adhesion of Thermal Sprayed Coating

    The 4th Asian Thermal Spray Conference  2009.10 

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    Event date: 2009.10

    Venue:Xi’an  

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  • 金型用耐熱鋳鉄の開発

    鈴木章史(D), 丸山 徹, 小林 武

    日本鋳造工学会  2009.10 

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  • Alloy Designing of Sulfide Dispersed Lead Free Bronze Castings

    T. Maruyama, T. Kobayashi, K. Hirose(Shiga Valve), R. Matsubayashi(Shiga Valve), H. Abe(Shiga Prefcture)

    日本鋳造工学会  2009.10 

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  • 硫黄成分に着目した硫化物分散型鉛フリー銅合金のリサイクル特性

    阿部弘幸 (滋賀県東北部工技セ), 丸山 徹, 小林 武, 松林良蔵 (ビワライト), 寺村正和 (滋賀バルブ協同組合)

    日本鋳造工学会  2009.10 

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  • 新しいけい酸マグネシウム系無機自硬性鋳型

    爲金貴大(D), 丸山 徹, 小林 武, 小楠竜也(山川産業), 易 宏治(山川産業)

    日本鋳造工学会  2009.10 

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  • 溶射基材のブラスト処理における残留グリット量と密着強さとの関係

    宮崎智也(D), 丸山 徹, 小林 武

    日本溶射協会  2009.6 

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  • Sulfide Dispersed Lead Free Copper Alloy Castings

    Czech Foundrymen Society  2009.6 

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    Event date: 2009.6

    Venue:Brno  

    Lead free copper alloy has been required for particular products, for example, plumbing products, due to harmfulness of lead, and has been developed in many countries. Especially, alloys which contain bismuth have been used as the lead free alloy. However, the properties of the lead free alloy containing bismuth is not enough to provide same properties of conventional copper alloy containing lead. Small deposits of bismuth can be barrier to disperse the alloy. A new type of lead free alloy has been developed to provide allowable properties, such as casting properties, mechanical properties and machinability. Sulfide was focused on for the substitute substance of lead due to lubricant property of sulfide. The way of dispersion of the sulfide in a matrix had been attempted although sulfide density is too small not to separate from a melt during melting. Element additions and controlling sulfur activity had been done to make the sulfide form in castings during solidification. Mechanical properties, casting properties and machinability of the developed alloy were evaluated.Sulfide formed during solidification after developing primary alpha copper dendrite. The sulfide dispersion was observed in the matrix. The microstructure of the sulfide dispersion was confirmed by optical microscope and SEM. Elemental distribution was also investigated by EDX and WDX. The sulfide is mainly copper sulfide. There were few shrinkage cavities due to sulfide dispersion in a part of solidification finish. Mechanical properties of sand castings were above the required value for conventional bronze castings. Machinability showed almost same as the lead containing castings.

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  • シミュレーション実験による発泡模型の熱分解生成物の解析

    山口貴正(D), 丸山 徹, 小林 武

    日本鋳造工学会  2009.5 

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  • 硫化物を分散させた鉛フリー青銅のろう接特性

    中安友明(D), 丸山 徹, 小林 武

    日本鋳造工学会  2009.5 

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  • 硫化物を分散させた鉛フリー青銅における偏晶反応で分散したL2相の凝固過程

    山口政宗(D), 阿部弘幸 (滋賀東北部工業技術セ), 丸山 徹, 小林 武

    日本鋳造工学会  2009.5 

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  • 重炭酸塩水溶液中での硫化物分散型鉛フリー青銅の腐食挙動

    織田大輝, 丸山 徹, 小林 武, 春名 匠

    日本金属学会  2009.3 

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  • 硫化物分散型鉛フリー青銅の硫酸塩水溶液中における耐食性評価

    織田大輝, 丸山 徹, 小林 武, 春名 匠

    第13回関西大学先端科学技術シンポジウムポスターセッション資料集  2009.1 

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  • 鋳鉄の消失模型鋳造における溶湯の充てん速度, 溶湯温度および熱分解ガス圧と鋳造方案との関係

    後藤直樹, 宮崎尚起, 丸山徹, 小林武

    日本鋳造工学会  2008.10 

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  • 硫化物を分散させた鉛フリー青銅における熱分解曲線の特徴, 鋳造・凝固特性および切削性について

    野洲拓也, 若井寛明, 阿倍弘幸, 丸山徹, 小林武

    日本鋳造工学会  2008.10 

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  • 硫化物分散型鉛フリー青銅の耐食性に及ぼすpHの影響

    織田大輝, 春名 匠, 丸山 徹, 小林 武

    日本金属学会  2008.9 

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    Event date: 2008.9

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  • 硫化物を分散させたCu-Ni-Si系合金の摩擦摩耗特性

    瀬尾尚之, 丸山 徹, 小林 武

    日本鋳造工学会  2008.5 

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    Event date: 2008.5

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  • 鋳鉄のろう接

    小林 武, 丸山 徹, 中安友明

    日本鋳造工学会  2008.5 

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    Event date: 2008.5

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  • Machining C87850 (PANEL, Topic : Sulfide Dispersed Copper Alloy Castings)

    T. Maruyama, H. Wakai, H. Abe, T. Kobayashi

    112th Metalcasting Congress  2008.5 

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    Event date: 2008.5

    Venue:Atlanta  

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  • Effect of the Blasting Time on the Amount of the Residual Grit on Blasted Steel Substrates

    T. Maruyama, T. Miyazaki, T. Kobayashi

    International Thermal Spray Conference and Exposition 2008  2008.5 

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    Event date: 2008.5

    Venue:Maastricht  

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  • 硫化物を分散させたPbフリー青銅の開発

    野洲拓也, 丸山 徹, 小林 武

    平成19年度MMAD研究会  2008.3 

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    Event date: 2008.3

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  • 硫化物を分散させた鉛フリー青銅のろう接特性

    中安友明, 丸山徹, 小林武

    日本鋳造工学会関西支部  2008 

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  • 精密鋳造にRP(ラピッドプロトタイピング)法を利用した迅速焼失模型鋳造法の開発

    小林 武, 丸山 徹, 塩田和彦, 嶋田裕典, 易 宏治, 小楠達也, 柏井茂雄, 兼吉高宏

    日本鋳造工学会関西支部  2008 

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  • 「鉛フリー青銅の開発」についての講演

    丸山徹

    関西私立大学産学連携技術セミナー2007  2007.12 

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    Event date: 2007.12

    Venue:神戸商工会議所  

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  • 銅合金の消失模型鋳造における欠陥発生と鋳造条件

    宮崎尚起, 中川剛志, 二川大治郎, 山本匡昭, 上田 泰, 丸山 徹, 小林 武

    日本学会発表 鋳造工学会関西支部YFE大会  2007.12 

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  • シミュレーション実験による発泡模型の熱分解生成物の解析

    山口貴正, 後藤直樹, 丸山 徹, 小林 武

    日本鋳造工学会関西支部YFE大会  2007.12 

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  • 硫化物を分散させたコルソン合金の摩擦摩耗特性

    瀬尾尚之, 松原竹志, 丸山 徹, 小林 武

    日本鋳造工学会関西支部YFE大会  2007.12 

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  • 硫化物を分散させたCu-Ni-Si系合金溶射皮膜の組織と摩擦・磨耗特性

    松原竹志, 丸山 徹, 小林 武

    日本溶射協会  2007.11 

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    Event date: 2007.11

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  • 消失模型鋳造法を用いた鉛フリー銅合金の鋳造

    中川剛志, 二川大治郎, 山本匡昭, 上田 泰, 丸山 徹

    日本鋳造工学会  2007.10 

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    Event date: 2007.10

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  • 鉛フリー化に対応するための鋳物砂中の有害金属元素の分析評価方法とその状況調査結果

    阿部弘幸, 小林 武, 丸山 徹, 廣瀬一輝, 松林良蔵

    日本鋳造工学会  2007.10 

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  • 硫化物を分散させたCu系軸受け材の開発

    吉田直登, 丸山徹, 小林 武

    日本鋳造工学会  2007.10 

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  • 硫化物を分散させた鉛フリー青銅の高温特性

    若井寛明, 入澤毅, 西内廣志, 阿部弘幸, 廣瀬一輝, 松林良蔵, 丸山徹, 小林武

    日本鋳造工学会  2007.5 

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    Event date: 2007.5

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  • 消失模型鋳造における発泡模型の熱分解生成物の状態別分析

    後藤直樹, 長谷川守, 中川剛志, 丸山 徹, 小林 武

    日本鋳造工学会  2007.5 

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  • 含Pb再生砂からの銅合金鋳物中への鉛の浸透

    阿部弘幸, 丸山 徹, 小林 武

    日本鋳造工学会  2007.5 

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  • 脱融液処理による含鉛青銅からの鉛分離

    丸山 徹, 酒井貴浩, 小林 武

    銅及び銅合金技術研究会  2007 

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    Event date: 2007

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  • Preparation and Properties of Lead Free Copper Alloy Castings with Dispersed Sulfide Particles

    T. Maruyama, H. Wakai, T. Sugitani, H. Nishiuchi, H. Abe, K. Horose, R. Matsubayashi, T. Kobayashi

    European Metallurgical Conference 2007  2007 

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  • TIGアークで焼入れした球状黒鉛鋳鉄の組織的特性

    丸山 徹, 小林 武

    日本学術振興会  2007 

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  • Effect of Zn Contents on Properties of Sulfide Dispersed Lead Free Copper Alloy Castings

    H. Wakai, T. Maruyama, T. Sugitani, H. Nishiuchi, H. Abe, K. Horose, R. Matsubayashi, T. Kobayashi

    European Metallurgical Conference 2007  2007 

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  • 硫化物を分散させた鉛フリー銅合金鋳物

    丸山 徹, 杉谷 崇, 若井寛明, 小林 武

    日本鋳造工学会 関西支部 平成18年度第2回鋳物・材料研究会, 第10回AT研究会  2007 

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  • 硫化物を分散させたCu-Ni-Si系合金の組織と摩擦・磨耗特性

    松原竹志, 丸山 徹, 小林 武

    日本鋳造工学会関西支部  2007 

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  • 硫化物を分散させたPbフリー青銅の開発

    若井寛明, 杉谷 崇, 西内廣志, 阿部弘幸, 廣瀬一輝, 松林良蔵, 丸山徹,, 小林武

    平成18年度MMAD研究会  2007 

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  • Effect of the blasting angle on the amount of the residual grit on blasted substrates

    T. Maruyama, K. Akagi, T. Kobayashi

    International Thermal Spray Conference and Exposition 2007  2007 

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    Event date: 2007

    Venue:Beijing  

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  • 固体潤滑剤を分散させた銅合金複合溶射皮膜の摺動特性

    吉田直登, 丸山 徹, 小林 武

    日本溶射協会  2006.11 

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    Event date: 2006.11

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  • 硫化物を分散させた鉛フリー青銅の凝固過程とその組織

    杉谷 崇, 若井寛明, 西内廣志, 阿部弘幸, 廣瀬一輝, 松林良蔵, 丸山徹, 小林武

    日本鋳造工学会  2006.10 

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    Event date: 2006.10

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  • 鉛フリー化に対応するための鋳物砂中の有害金属元素の分析評価方法とその状況調査結果

    阿部弘幸, 小林 武, 丸山 徹, 廣瀬一輝, 松林良蔵

    日本鋳造工学会  2006.10 

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  • 硫化物を分散させた鉛フリー青銅の鋳造特性

    若井寛明, 杉谷 崇, 西内廣志, 阿部弘幸, 廣瀬一輝, 松林良蔵, 丸山 徹, 小林 武

    日本鋳造工学会  2006.10 

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  • 硫化物を分散させた鉛フリー青銅の鋳造組織に及ぼす成分元素の影響

    杉谷 崇, 若井寛明, 西内廣志, 阿部弘幸, 廣瀬一輝, 松林良蔵, 丸山 徹, 小林 武

    日本鋳造工学会  2006.5 

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  • シミュレーション実験による消失模型鋳造用ポリマーの熱分解

    長谷川守, 丸山 徹, 小林 武

    日本鋳造工学会  2006.5 

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  • Cu‒Sn‒Zn‒Pb系合金からの偏晶反応を利用した鉛の分離挙動

    酒井貴浩, 丸山 徹, 小林 武

    日本鋳造工学会  2006.5 

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  • 硫化物を分散させた鉛フリー青銅の開発

    丸山 徹, 若井寛明, 杉谷 崇, 西内廣志, 阿部弘幸, 廣瀬一輝, 松林良蔵, 小林 武

    日本鋳造工学会  2006.5 

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  • 硫化物を分散させた鉛フリー青銅機械的性質と切削性に及ぼす成分元素の影響

    若井寛明, 杉谷 崇, 西内廣志, 阿部弘幸, 廣瀬一輝, 松林良蔵, 丸山 徹, 小林 武

    日本鋳造工学会  2006.5 

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  • 関西大学における材料教育

    三宅秀和, 星山康洋, 丸山徹, 小林武

    日本鋳造工学会・関西支部  2006.3 

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  • Effects of blasting parameters on removability of residual grit

    International Thermal Spray Conference and Exposition  2006 

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    Event date: 2006

    Venue:Seattle  

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  • 硫化物を分散させた鉛フリー銅合金の高温硬さ

    廣口大祐, 若井寛明, 杉谷 崇, 丸山 徹, 小林 武

    日本鋳造工学会 関西支部 平成18年度「学生・院生, 若手研究者・技術者による発表大会」  2006 

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  • 鋳鉄の消失模型鋳造における分解ガス層中の温度測定

    中川剛志, 丸山 徹, 小林 武

    日本鋳造工学会  2006 

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  • 鋳鉄材料のろう接

    小林 武, 丸山 徹

    日本学術振興会, 鋳物第24委員会 複合化プロセス文科会  2006 

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  • Cu-Ni-Si合金の溶射皮膜組織

    松原竹志, 赤木健一, 丸山 徹, 西本明生, 赤松勝也, 中尾和祺, 小林 武

    日本溶射協会  2005.11 

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    Event date: 2005.11

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  • 鋳鉄の消失模型鋳造における熱分解ガス層中の温度分布

    甲木晃晴, 丸山 徹, 小林 武

    日本鋳造工学会  2005.10 

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  • 鋳造技術者教育とその保証

    丸山徹, 星山康洋, 三宅秀和, 小林武

    日本鋳造工学会  2005.10 

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  • YFEによるこども鋳物教室と鋳造技術の伝承

    栗熊勉, 清水一道, 平塚貞人, 駒崎徹, 秋田憲宏, 米田隆志, 丸山徹, 広藤朋一, 宮原広郁

    日本鋳造工学会  2005.10 

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  • ビスマス青銅の熱分析及び凝固特性

    杉谷崇, 丸山 徹, 小林 武

    日本鋳造工学会  2005.10 

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  • A1-Si合金の共晶溶湯による同系過共晶合金の溶射皮膜の鋳ぐるみ処理

    赤木健一, 丸山 徹, 小林 武

    日本溶射協会  2005.6 

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    Event date: 2005.6

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  • 鋳鉄の消失模型鋳造における模型分解面, 溶湯面および分解ガス圧の挙動に及ぼす塗型通気度の影響

    甲木晃晴, 丸山 徹, 小林 武

    日本鋳造工学会  2005.5 

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  • Cu-Zn合金におけるBiのZn当量に及ぼすBi添加量と冷却速度の影響

    丸山 徹, 坂口裕樹, 小林 武

    日本伸銅協会  2005 

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  • Shape of cast iron melt surface and pattern decomposition surface in evaporative pattern casting by using coating of various permeability

    Proceedings of the 2nd Japan-Korea Workshop for Young Foundry Engineers  2005 

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    Event date: 2005

    Venue:Jeju Island  

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  • Residual grit on the substrate surface in roughening treatment

    quantitative evaluation and a reduction technique,International Thermal Spray Conference and Exposition  2005 

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    Event date: 2005

    Venue:Basel  

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  • 鋳鉄の消失模型鋳造法のおける熱分解ガス層中の温度分布

    甲木晃晴, 丸山 徹, 小林 武

    日本学術振興会, 鋳物第24委員会 鋳鉄分科会  2005 

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  • Bi青銅の熱分析および凝固特性

    杉谷 崇, 後藤 悠史, 丸山 徹

    日本非鉄鋳物協会・日本鋳造工学会  2005 

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  • 通気度の異なる塗型を用いた鋳鉄の消失模型鋳造法における溶湯面形状,模型分解面形状および分解ガス圧の挙動

    甲木晃晴, 丸山 徹, 小林 武

    関西大学工学部金属・材料・先端マテリアル研究会(MMAD研究会)  2005 

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    Event date: 2005

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  • 「鋳造技術者教育とその保証」 について

    丸山徹, 星山康洋, 三宅 秀和, 小林 武

    日本鋳造工学会 関西支部  2005 

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  • Cu-Sn-Zn-Pb系合金からのPbの偏晶分離に及ぼすPb量の影響

    酒井貴浩, 丸山 徹, 小林 武

    日本鋳造工学会 関西支部  2005 

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  • ソリッドモールド鋳造用の焼失型RP模型の諸特性

    松林正樹, 丸山徹, 小林武

    日本鋳造工学会 関西支部  2005 

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  • Al-Si合金の共晶溶湯による同系過共晶合金の溶射皮膜の鋳ぐるみ処理

    赤木健一, 丸山 徹, 小林 武

    日本鋳造工学会関西支部  2005 

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  • 回転電極法によるコルソン系銅合金の粉末化と焼結材の性質

    赤松勝也, 小林 武, 西本明生, 丸山 徹, 中尾和祺, 神村武志

    銅及び銅合金技術研究会  2005 

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  • 消失模型鋳造用ポリスチレンの熱分解挙動に及ぼす熱分解温度と時間の影響

    長谷川守, 丸山 徹, 小林 武

    日本鋳造工学会 関西支部  2005 

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  • 残留グリット低減剤を利用した溶射皮膜組織の問題点とその対策

    辻本健太郎, 丸山 徹, 小林 武

    日本溶射協会  2004.12 

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  • 青銅鋳物に含まれる微量鉛の炉前判定法

    今西洋平, 丸山 徹, 小林 武

    日本鋳造工学会  2004.9 

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  • Siを添加した鉛入り銅合金における鉛の分離挙動

    大久保泰史, 丸山 徹, 小林 武

    日本鋳造工学会  2004.9 

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  • 粗面化処理における残留グリッド量の評価とその低減対策

    辻本健太郎, 丸山徹, 小林武

    日本溶射協会  2004.6 

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  • Cu-Pb-Si系合金の二相分離反応と組織

    大久保泰史, 丸山徹, 小林武

    日本鋳造工学会  2004.4 

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  • 青銅鋳物に含まれる微量鉛の迅速判定法

    小林武, 丸山徹

    日本非鉄鋳物協会・日本鋳造工学会  2004 

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    Event date: 2004.4

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  • 固体潤滑性を持ったCu系複合溶射皮膜と鋳鉄との鋳ぐるみにおける問題点

    小林武, 丸山徹, 加藤伸太郎

    日本学術振興会  2004 

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  • Cu―Pb―Si系合金の二相分離反応と組織について

    甲木晃晴, 丸山 徹, 小林 武

    日本鋳造工学会 関西支部  2004 

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  • Cu系複合溶射皮膜の鋳鉄による鋳ぐるみにおける問題点

    加藤伸太郎, 丸山 徹, 小林 武

    日本鋳造工学会 関西支部  2004 

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  • 鋳鉄の消失模型鋳造における模型の熱分解面形状に及ぼす溶湯面形状の影響

    小林武, 丸山徹, 久米井隆成

    日本鋳造工学会関西支部  2004 

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  • Influence of substrate surface roughness on adhesive property of sprayed coating

    International Thermal Spray Conference and Exposition, Characterization methodsfor coating properties1―6  2004 

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    Venue:Osaka  

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  • 鋳鉄の消失模型鋳造における模型熱分解面および溶湯面の挙動に及ぼす塗型通気度の影響

    甲木晃晴, 丸山 徹, 小林 武

    日本学術振興会  2004 

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  • Cu―Zn合金におけるSnのZn当量に及ぼすSn添加量と冷却速度の影響

    坂口祐樹, 丸山 徹, 小林 武

    日本伸銅協会  2004 

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  • Cu―Zn合金におけるNiのZn当量に及ぼすNi添加量と冷却速度の影響

    丸山 徹, 坂口祐樹, 小林 武

    日本伸銅協会  2004 

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  • 物造りの技術と伝承

    丸山徹, 三宅秀和, 小林武

    日本鋳造工学会関西支部  2004 

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  • 「技術の伝承」と組織的教育プログラム

    丸山 徹, 三宅秀和, 小林 武

    日本鋳造工学会  2003.10 

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  • 鋳鉄による固体潤滑剤を含む複合溶射成形皮膜の鋳ぐるみ

    加藤伸太郎(D), 丸山 徹, 小林 武

    日本鋳造工学会  2003.10 

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  • 各種鉛フリー銅合金鋳物の鋳造組織と熱分析

    丸山 徹, 小林 武, 石金良一 (中越合金鋳工), 丸 直樹 (大丸工業), 橘 徹行 (日邦バルブ), 堀込昭彦 (キッツ)

    日本鋳造工学会  2003.5 

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  • 消失模型鋳造法における溶湯面及び模型の熱分解面の変遷

    久米井隆成(D), 丸山 徹, 小林 武

    日本鋳造工学会  2003.5 

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  • 消失模型鋳造法における環境適応型模型の熱分解促進

    丸山 徹, 小林 武

    関西大学 先端科学技術推進機構  2003.3 

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  • レーザ加工による熱分解ガス排出口を持った発泡模型

    久米井隆成(D), 丸山 徹, 小林 武

    日本鋳造工学会  2002.10 

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  • Si系金属間化合物を分散させたPbフリー青銅鋳物の諸特性

    宮武良輔(D), 丸山 徹, 小林 武

    日本鋳造工学会  2002.10 

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  • 固体潤滑剤と青銅合金粉末との複合溶射皮膜の摺動特性

    安田 勉(D), 丸山 徹, 小林 武

    日本溶射協会  2002.6 

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  • シミュレーションによる金属・酸化物粉を配合した発泡模型の熱分解生成物

    丸山 徹, 小林 武

    日本鋳造工学会  2002.5 

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  • Al-Si系合金の消失模型鋳造における金属・酸化物粉を配合した発泡模型の熱分解特性

    小林 武, 丸山 徹

    関西大学 工業技術研究所  2002.3 

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    Event date: 2002.3

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  • アシキュラ鋳鉄の組織に及ぼす冷却速度の影響

    丸山 徹, 小林 武

    日本鋳造工学会  2001.10 

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  • 金属・酸化物を添加したポリスチレンの熱分解ガスの通気特性

    丸山 徹, 小林 武

    日本鋳造工学会  2001.10 

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  • フレーム溶射によるAl,NiおよびNiO粉末を用いた反応性溶射

    丸山 徹, 小林 武

    日本溶射協会  2001.6 

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  • 基材表面の凹凸形状と溶射皮膜の密着特性

    丸山 徹, 小林 武

    日本溶射協会  2001.6 

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  • Al合金の消失模型鋳造における熱分解促進剤を配合した発泡模型の熱分解挙動

    堀田 真(D), 丸山 徹, 小林 武

    日本鋳造工学会  2001.4 

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    Event date: 2001.4

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  • 鋳鉄の消失模型鋳造における熱分解促進剤を配合した発泡模型の熱分解挙動

    堀田 真(D), 丸山 徹, 小林 武

    日本鋳造工学会  2001.4 

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  • フレーム溶射における基材の表面状態と溶射皮膜の密着特性

    丸山 徹, 小林 武

    日本溶射協会  2000.11 

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  • 熱分析曲線に潜む情報とノイズのパソコンによる分別処理

    丸山 徹, 小林 武

    日本鋳造工学会  2000.9 

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    Event date: 2000.9

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  • 溶射成形で作られた簡易金型による発泡模型の試作

    堀田 真(D), 狩野真年(D), 丸山 徹, 小林 武

    日本鋳造工学会  2000.9 

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  • 包晶変態とオーステナイト結晶粒の形成機構

    工藤昌行(北大), 伊藤洋一(北大), 松浦清隆(北大), ,丸山 徹, 小野寺邦之(D 北大)

    日本鉄鋼協会  2000.9 

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  • 環境適応型鋳造法としての消失模型鋳造法に関する研究

    小林 武, 丸山 徹

    関西大学 工業技術研究所  2000.8 

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  • フレーム溶射による黒鉛を含むCu系摺動材皮膜の試作

    丸山 徹, 小林 武, 初川謙二(D)

    日本溶射協会  2000.6 

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  • Effect of Solute Elements on the Formation of Austenite Grain for Hypo-Peritectic Steel.

    The Iron and Steel Institute of Japan  1999.9 

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    Event date: 1999.9

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  • Transition from delta Dendrite to Austenite Grain for Peritectic Steel.

    The Iron and Steel Institute of Japan  1998.9 

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  • Development of Austenite Grain for Hyper-Peritectic Carbon Steel.

    The Iron and Steel Institute of Japan  1998.3 

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  • Evaporation Rate of Copper from Liquid Iron by Urea Spraying under Reduced Pressure.

    The Iron and Steel Institute of Japan  1997.9 

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  • Accelerative Evaporation of Copper from Molten Steel by Urea Spraying under Reduced Pressure.

    The Iron and Steel Institute of Japan  1997.3 

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  • Evaporation Behavior of Molten Copper and Pig Iron by Urea Additon.

    The Iron and Steel Institute of Japan  1995.11 

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    Event date: 1995.11

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  • 消失模型鋳造用EPS模型内の不活性ガスによる置換と湯流れ挙動

    丸山徹

    日本鋳造工学会  2023.5 

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  • 鋳鉄フルモールド鋳造のX線透過観察による鋳造方案と湯流れ速度の考察

    村田幸雄, 杉山明, 丸山徹

    日本鋳造工学会  2022.9 

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  • 鋳鉄の消失模型鋳造におけるPMMA系模型の分解と湯流れに及ぼすMA量の影響

    岩間亮, 丸山徹, 原口健二, 後藤準平

    日本鋳造工学会  2022.9 

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  • 隙間噴流試験中の銅合金の電気化学反応

    安田吉伸, 水谷直弘, 松林良蔵, 丸山徹, 春名匠

    日本鋳造工学会  2022.9 

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  • 低硫黄とした球状黒鉛鋳鉄の黒鉛粒数に及ぼすテルル添加形態の影響

    八田直也, 丸山徹, 澤田健二, 西原佳和

    日本鋳造工学会  2022.9 

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  • Preparation of Spheroidal Graphite Cast Iron Specimens for Transmission Electron Microscopy Observation Using an Ion Slicer

    TAKESHI, Nagase, MARUYAMA,Toru, ASANO, Kazunori, IGARASHI, Yoshio

    日本鋳造工学会  2022.5 

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  • 鋳鉄の接種剤溶融過程における黒鉛核物質生成の熱力学的検討

    丸山徹

    日本鋳造工学会  2022.5 

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  • 鋳鉄フルモールド鋳造のキャビティ内湯面のX線透過観察

    村田幸雄, 杉山明, 丸山徹

    日本鋳造工学会  2022.5 

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  • MnFeCoNiCu系ハイエントロピー合金鋳造材の引張特性に及ぼす炭素の影響

    丸山徹, 太田一成

    日本鋳造工学会  2022.5 

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  • CrFeCoNi系ハイエントロピー合金の凝固組織及び機械的性質に及ぼすSiの影響

    福澤芽衣, 丸山徹

    日本鋳造工学会  2021.10 

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  • フランプロセスの高度化による鋳物砂接着状態の変化と鋳型強度向上

    吉迫竜也, 丸山徹, 藤原伊知郎, 藤原宏司

    日本鋳造工学会  2021.10 

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  • 鋳鉄の消失模型鋳造における模型成分量が及ぼすガス層厚さへの影響

    岩間亮, 丸山徹, 原口健二, 後藤準平

    日本鋳造工学会  2021.10 

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  • 鋳鉄のフルモールド鋳造における湯道の湯流れとガス溜まり生成のX線透過観察

    村田幸雄, 杉山明, 丸山徹

    日本鋳造工学会  2021.10 

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  • 隙間噴流試験中の銅合金に作用する腐食反応

    安田吉伸, 水谷直弘, 松林良蔵, 丸山徹, 春名匠

    表面技術協会  2021.9 

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  • CV黒鉛化処理法と溶湯保持による冷却曲線と黒鉛形状への影響

    辻 寛明, 山本 展也, 甲斐 登起雄, 丸山 徹, 中江 秀雄

    日本鋳造工学会  2021.5 

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    Venue:オンライン  

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  • STEM Characterization of Cu distribution in Cu-added spheroidal graphite cast iron

    TAKESHI, Nagase, MARUYAMA,Toru, ASANO, Kazunori, IGARASHI, Yoshio

    Japan Foundry Engineering Society  2021.5 

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  • フルモールド鋳造法における鋳鉄溶湯が模型に接してからの挙動のX線透過観察

    村田 幸雄, 杉山 明, 丸山 徹

    日本鋳造工学会  2021.5 

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    Venue:オンライン  

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  • 鋳鉄の消失模型鋳造における湯流れ速度に及ぼす模型内のアルゴンガス置換の影響

    丸山 徹, 西 豊祐

    日本鋳造工学会  2021.5 

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    Venue:オンライン  

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  • CrFeCoNi系ハイエントロピー合金の合金設計と凝固組織

    丸山 徹, 星山 康洋, 濱本大地, 太田一成

    関西大学先端科学技術推進機構  2020.1 

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  • 塩化物水溶液中におけるCu合金の腐食に及ぼすCuイオンの影響

    安田 吉伸, 松林 良蔵, 丸山 徹, 春名 匠

    日本銅学会  2019.10 

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  • 球状黒鉛鋳鉄のラマン分光法

    永瀬丈嗣, 鴨井督, 松村浩太郎, 中澤耕一郎, 古屋諭, 尾添伸明, 吉野勝美, 丸山 徹, 五十嵐芳夫

    日本鋳造工学会  2019.9 

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  • テルルを添加した球状黒鉛鋳鉄の黒鉛粒数に及ぼす微量元素とテルルの形態の影響

    加藤剛大, 丸山 徹, 柳谷仁志, 澤田健二, 中本光二

    日本鋳造工学会  2019.9 

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  • 炭素を含むMnFeCoNiCu系ハイエントロピー合金の凝固組織と低温引張特性

    丸山 徹, 徳満陽香, 高島和樹

    日本鋳造工学会  2019.5 

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  • 鋳鉄溶湯注湯時における生型内の温度・ガス圧の分布に及ぼす炭素系粉末の影響

    丸山 徹, 近藤克哉

    日本鋳造工学会  2019.5 

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  • 走査透過電子顕微鏡を用いた球状黒鉛鋳鉄核物質の微量元素分布解明

    永瀬 丈嗣, 丸山 徹, 五十嵐芳夫

    日本金属学会  2019.2 

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  • CrMnFeCoNi系ハイエントロピー合金の時効硬化に及ぼすエントロピーの影響

    丸山 徹, 高島和樹

    関西大学先端科学技術推進機構  2019.1 

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  • 湯流れ時における青銅溶湯/砂型間の熱伝達係数の取得

    本山雄一, 徳永仁史, 岡根利光, 吉田誠, 丸山 徹

    日本鋳造工学会  2018.10 

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  • 硫化物分散型鉛フリー銅合金の耐エロージョン・コロージョン性に及ぼす試験溶液の流量の影響

    安田 吉伸, 水谷直弘, 阿部 弘幸, 松林 良蔵, 丸山 徹, 春名 匠

    日本鋳造工学会  2018.10 

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  • STEM Observation of Spheroidal Graphite Cast Iron by Focusing on Elemental Distribution

    TAKESHI, Nagase, MARUYAMA,Toru, IGARASHI, Yoshio

    日本鋳造工学会  2018.10 

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  • 消失模型鋳造の湯流れ挙動に及ぼす塗型層内の空孔率・通気度の影響

    南彬, 下薄拓実, 小田萌美, 丸山 徹

    日本鋳造工学会  2018.10 

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  • 試験溶液の流量を変えて実施した隙間噴流試験による硫化物分散型鉛フリー銅合金の耐エロージョン・コロージョン性評価

    安田 吉伸, 水谷直弘, 阿部 弘幸, 松林 良蔵, 丸山 徹, 春名 匠

    日本防錆技術協会  2018.6 

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  • 銅合金鋳物に関する最近の課題と取り組みについて

    丸山 徹, 井上晃, 小川貴行, 奥村功, 森久修, 山田浩士

    日本鋳造工学会  2018.5 

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  • 青銅の金型鋳造におけるCAE解析による湯流れ挙動の検討

    山田浩士, 廣田修平, 兼吉高宏, 柏井茂雄, 森拓樹, 丸山 徹

    日本鋳造工学会  2018.5 

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  • 鉛フリービスマス青銅鋳物CAC902の金型鋳造における熱流動・凝固解析

    本山雄一, 山田浩士, 明石隆史, 黒野直哉, 吉田誠, 丸山 徹

    日本鋳造工学会  2018.5 

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  • 鋳造法で作製したCrMnFeCoNiハイエントロピー合金の組織に及ぼす熱処理の影響

    丸山 徹, 高島和樹

    関西大学先端科学技術推進機構  2018.1 

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  • 侵入型固溶元素を導入したハイエントロピー合金の凝固組織

    丸山 徹, 高島和樹, 大野千尋

    関西大学先端科学技術推進機構  2018.1 

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  • 先進電子顕微鏡法を利用した球状黒鉛鋳鉄の組織観察

    永瀬 丈嗣, 丸山 徹, 五十嵐芳夫

    日本鋳造工学会  2017.5 

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  • 極低硫黄鋳鉄の黒鉛組織に及ぼするつぼ材質の影響

    丸山 徹

    日本鋳造工学会  2017.5 

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  • 球状黒鉛鋳鉄の黒鉛粒数に及ぼすテルルとレアアースの影響

    丸山 徹, 齋藤隆太, 仲村利樹, 柳谷仁志, 堺貴洋, 中本光二

    日本鋳造工学会  2017.5 

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  • 鋳造法で作製したCrMnFeCoNi系ハイエントロピー合金の硬さと凝固組織

    丸山 徹, 高島和樹

    関西大学先端科学技術推進機構  2017.1 

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  • FCC系CoCrFeMnNi高エントロピー合金へのプラズマ窒化処理

    福部貴大, 清水渉太, 西本 明生, 丸山 徹

    日本熱処理技術協会  2016.12 

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  • 亜鉛合金溶射皮膜の密着性が向上するブラスト加工条件の検討

    丸山 徹

    産報出版  2015.9 

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  • オルトケイ酸マグネシウムを硬化剤とした鋳型の耐熱性

    丸山 徹, 水田 善友, 小林 武, 小楠 竜也, 易 宏治

    日本鋳造工学会  2010.5 

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    Venue:東大阪  

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  • 硫化物分散型鉛フリー銅合金の摩擦・摩耗特性

    佐藤知広, 平井良政, 丸山 徹, 小林 武

    日本機械学会関西支部定時総会講演会講演論文集  2010.3 

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    Venue:神戸  

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  • 青銅鋳物に含まれる微量鉛の迅速判定法

    小林武, 丸山徹

    日本非鉄鋳物協会・日本鋳造工学会「銅合金研究部会」資料  2004 

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Industrial property rights

  • 摺動材用銅合金

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    Application no:2012-511684  Date applied:2011.4

    Announcement no:WO2011/132703  Date announced:2011.10

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  • 耐熱性に優れたフェライト系鋳鉄

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    Application no:2010-076129  Date applied:2010.3

    Announcement no:2011-208205  Date announced:2011.10

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  • Lead-free copper alloy for casting with excellent mechanical properties

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    Application no:2009-126918  Date applied:2009.5

    Announcement no:WO2010/137483  Date announced:2010.12

    Patent/Registration no:5335558  Date registered:2012.8  Date issued:2012.8

    US 8470101 B2

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  • 摺動部材用銅合金

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    Application no:2009-100355  Date applied:2009.3

    Announcement no:2010-150649  Date announced:2010.7

    Patent/Registration no:4658269  Date registered:2011.1  Date issued:2011.1

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  • 青銅合金及びその製造方法、青銅合金を用いた摺動部材

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    Application no:2008-268822  Date applied:2008.10

    Announcement no:2010-031347  Date announced:2010.2

    Patent/Registration no:4806823  Date registered:2011.8  Date issued:2011.8

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  • 摺動部材用銅合金

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    Application no:2007-337872  Date applied:2007.11

    Announcement no:2009-132986  Date announced:2009.6

    Patent/Registration no:5201444  Date registered:2013.2  Date issued:2013.2

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  • Copper alloy for sliding maerial which has excellent bearing properties

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    Application no:2007-550329  Date applied:2007.4

    Announcement no:WO2007/126006  Date announced:2007.11

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  • 被削性に優れた鋳物用無鉛銅合金

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    Application no:2006-126666  Date applied:2006.4

    Announcement no:2007-297675  Date announced:2007.11

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  • 耐圧性に優れた鋳物用無鉛銅合金

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    Application no:2004-344541  Date applied:2004.11

    Announcement no:2006-152373  Date announced:2006.6

    Patent/Registration no:3957308  Date registered:2007.5  Date issued:2007.5

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  • ブラスト加工方法

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    Application no:2004-176459  Date applied:2004.6

    Announcement no:2006-000933  Date announced:2006.1

    Patent/Registration no:4452564  Date registered:2010.2  Date issued:2010.2

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  • 銅合金からの鉛分離方法

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    Application no:2004-175160  Date applied:2004.6

    Announcement no:2005-350753  Date announced:2005.12

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  • 無鉛快削銅合金材

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    Application no:2002-055007  Date applied:2002.2

    Announcement no:2003-253358  Date announced:2003.9

    Patent/Registration no:3789833  Date registered:2006.4  Date issued:2006.4

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  • 快削性銅合金材

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    Application no:2002-055008  Date applied:2002.2

    Announcement no:2003-253359  Date announced:2003.9

    Patent/Registration no:3801518  Date registered:2006.5  Date issued:2006.5

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  • 被削性に優れた鋳物用無鉛銅合金

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    Application no:2001-346584  Date applied:2001.11

    Announcement no:2003-147460  Date announced:2003.5

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Awards

  • 中小企業庁長官奨励賞(近畿地方)

    2013.11   日本発明協会  

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    Country:Japan

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  • 第29回研究奨励賞

    2012.4   日本鋳造工学会関西支部  

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    Country:Japan

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  • 優秀論文賞

    2011.5   日本鋳造工学会  

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    Country:Japan

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  • 第27回研究奨励賞

    2010.6   日本鋳造工学会関西支部  

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    Country:Japan

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  • 日下賞

    2010.5   日本鋳造工学会  

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    Country:Japan

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  • 学の実化賞

    2010.5   関西大学科学技術振興会  

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    Country:Japan

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  • 優秀技術賞

    2009.3   日本非鉄金属鋳物協会  

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    Country:Japan

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  • 第25回研究奨励賞

    2008.6   日本鋳造工学会関西支部  

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    Country:Japan

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  • The 23th Encouragement prize

    2006.6   Kansai Branch of Japan Foundrymen's Society  

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    Country:Japan

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  • The 18th Encouragement priz

    2001.6   Kansai Branch of Japan Foundrymen's Society  

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    Country:Japan

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  • Encouragement prize

    2001.6   Japan Thermal Spraying Society  

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    Country:Japan

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  • Encouragement prize

    1997.1   Hokkaido Branch of The Iron and Steel Institute of Japan  

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    Country:Japan

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Research Projects

  • Elucidation of thermal oxidative decomposition of foamed pattern in evaporatibe pattern casting and verification by in-situ observation of molten metal flow

    Grant number:21K04742  2021.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

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    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

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  • Clarification of the effect of surface penetrant material on composite deterioration of concrete structures using chemical analytical methods

    Grant number:19K04560  2019.4 - 2022.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    TSURUTA Hiroaki

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    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

    In confirming the basic physical properties and deterioration inhibition effect of the specimen coated with the surface penetrant material, the silane-based one having an amino group has an excellent carbonation inhibition effect as compared with other silane-based ones in the outdoor exposure test. It was confirmed that when used in combination with other silane-based ones, a high inhibition effect on the complex deterioration of carbonation and chloride induced deterioration can be obtained. In the confirmation of the composition change of the surface penetrant material coating part using chemical analysis, it was possible to confirm the composition change by utilizing SEM-EDX analysis, Raman spectroscopy, and FT-IR. In the discussion of the deterioration inhibition effect of the surface penetrant material, it was confirmed from the analysis results that a part of the deterioration inhibition mechanism could be clarified.

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  • Clarification of thermal decomposition products and dyamic equilibrium in thermal decomposition gas layer on evaporative pattern casting process

    Grant number:26420760  2014.4 - 2017.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    MARUYAMA Toru

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    Grant amount:\4940000 ( Direct Cost: \3800000 、 Indirect Cost:\1140000 )

    In order to clarify the relationship between residue formation and dynamic equilibrium in thermal decomposition gas layer on evaporative pattern casting process, influence of molten metal temperature on mold filling rate and thermal decomposition products formed during casting were examined. The dynamic equilibrium is depolymerization type until 900℃ of molten metal temperature, and does not become static state due to decomposition of monomer over 950℃ of molten metal temperature. Also, the amount of liquefied resin was extremely large. Carbon particles as results of thermal decomposition were suspended in the liquefied resin. In addition, molten metal flow become slow, and residue was formed.

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  • 環境対応型非鉄金属鋳造技術に関する研究開発/高耐焼付性低鉛・鉛フリー軸受銅合金の開発(委託者:社団法人日本非鉄金属鋳物協会)

    2006 - 2007

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    Grant type:Competitive

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  • Elucidations of technical problems and fundamental solution on in composite process between thermal spraying process of composite coating and casting-solidification process

    Grant number:16560652  2004 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    KOBAYASHI Takeshi, MARUYAMA Toru

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    Grant amount:\2400000 ( Direct Cost: \2400000 )

    We evaluated the characteristics of the composite coating formed by thermal spraying of Cn-Ni system alloy powder blended with CaF_2 powder. When the composite coating was subjected to insert treatment with cast iron, a problem of gas detect specific to composite coatings occurred. The results of implementation of various solutions for this problem are given below.
    (1) CaF_2 forming a layer structure dispersed uniformly in the composite coating. As the CaF2 blended ratio became higher, the CaF_2 area fraction increased. The hardness was lowest when the CaF2 area fraction was approx. 6%.
    (2) As the result of Falex test for the composite coating, it was revealed that the wear loss decreased as the quantity of CaF_2 serving as a solid lubricant in the coating increased and that the coefficient of friction became lower when the temperature near the friction surface was higher than 200℃.
    (3) A large quantity of oxide exists in the composite coating. When the coating was inserted directly with cast iron, the carbon in the cast iron reacted with the oxide to generate CO gas, resulting in gas defect.
    (4) Then, we revealed that the composite coating could be bonded when the coating was inserted with cast iron after a bond coat of pure copper was sprayed over the coating and the coating was embedded in charcoal to subject it to deoxidation treatment (1023K, 12hrs).
    (5) When the spraying was performed while cooling air was flowing in a copper pipe (20-mm-diam), the layer structure of the composite coating became blurred.
    (6) When a thin copper pipe (6-mm-diam) was put in the center of the copper pipe to which coating had adhered during insert treatment, the space between the outer pipe and the thin pipe was filled up with foundry sand (#6) and the inside of the thin pipe was cooled with air, the composite coating melted because the cooling capacity of air is low, and cavities occurred in the interface between the coating and the cast iron. When the pipe was cooled with water in place of air, the bond coat melted, and the final solidification part of the cast iron caused contraction.
    (7) When the copper pipe (20-mm-diam) to which the composite coating had adhered was cooled with water directly from the inside, the cast iron was rapidly cooled, and the thin part of the casting showed chilling.

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Social Activities

  • Program Maneger, ”Kinki Area, Traing Project of Foundry Engineer”, Academia-Industry Joint Projects on Training Core Human Resources for Manufacturing

    2005

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  • Visiting Resercher of Hyogo Prefectural Institute of Technology

    2003

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Devising educational methods

  • Webや図書資料の自己学習により、授業前の予習を課している。授業の最初に予習の出来具合をチェックし、学生の知識を確認している。その知識量に応じて授業における説明の量と深さを考えながら授業を行っている。授業評価アンケートの結果、「予習型の課題が理解を助けた」との回答が得られた。 一部の授業で、学生自身による自己評価型の授業を行っている。授業中に課題を課し、その回答を他の学生に評価させ、その結果を元の学生にフィードバックさせている。授業後の感想・意見の情報収集を行った結果、「フィードバックによって、自らの不足点が明確にわかる」との回答を得た。また、「授業中にその不足点の改善ができた」との回答もあった。 授業評価アンケートをとった学部教育科目において、アンケートの回答内容に対するフィードバックを行い、学生の要望に応じて授業の内容について改善および説明を行った。

Teaching materials

  • 特になし

Teaching method presentations

  • 三宅秀和、星山康洋、丸山徹、小林武:関西大学における材料教育、日本鋳造工学会・関西支部「第8回アドヴァンストテクノロジー研究会、第2回鋳物・材料研究会」資料No.4、(2006)

Special notes on other educational activities

  •  特になし