Updated on 2026/05/01

写真a

 
YAMAMOTO Hajime
 
Organization
Faculty of Chemistry, Materials and Bioengineering Associate Professor
Title
Associate Professor
Contact information
メールアドレス
External link

Degree

  • Dr. Eng. ( 2019.2   Osaka University )

Research Interests

  • Solid state joining

  • Additive manufacturing

  • Dissimilar welding

  • Surface modification

  • Composite

  • Wear

  • Surfaces and interfaces

  • Steel

  • Friction stir welding

  • Friction stir processing

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Manufacturing and production engineering

  • Nanotechnology/Materials / Composite materials and interfaces

  • Nanotechnology/Materials / Structural materials and functional materials

  • Nanotechnology/Materials / Material processing and microstructure control

Education

  • Osaka University   Graduate School of Engineering   Division of Materials and Manufacturing Science

    2014.4 - 2019.2

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    Country: Japan

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  • Kansai University   Faculty of Chemistry, Materials and Bioengineering   Department of Chemistry and Materials Engineering

    2010.4 - 2014.3

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    Country: Japan

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Research History

  • Osaka University   Joining and Welding Research Institute   Assistant Professor

    2019.2

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Professional Memberships

  • The Iron and Steel Institute of Japan

    2023.1 - Present

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  • Smart Processing Society for Materials, Environment & Energy

    2018.11 - Present

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  • The Japan Institute of Metals and Materials

    2015.6 - Present

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  • Japan Welding Society

    2014.2 - Present

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Committee Memberships

  • 一般社団法人 溶接学会   若手会員の会運営委員会 副委員長  

    2024.4 - Present   

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  • 一般社団法人 溶接学会   全国大会運営委員会 委員  

    2024.4 - Present   

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  • 一般社団法人 日本鉄鋼協会   創形創質工学部会 接合・結合フォーラム 委員  

    2023.1 - Present   

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    Committee type:Academic society

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  • 一般社団法人 溶接学会   編集委員会 委員  

    2020.4 - 2024.3   

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    Committee type:Academic society

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  • 一般社団法人 溶接学会   若手会員の会運営委員会 委員  

    2019.4 - 2024.3   

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    Committee type:Academic society

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Papers

  • Compressive residual stress applied to a low-carbon steel surface alloyed with WC tool constituent elements according to friction stir processing Reviewed

    Hajime Yamamoto, Yuji Yamamoto, Kazuhiro Ito, Yoshiki Mikami

    Materials & Design   244   113225   2024.8

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.matdes.2024.113225

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  • Strengthening of Al/Cu dissimilar joint due to complicated interface produced by pulsed TIG welding with a constricted nozzle Invited

    Hajime Yamamoto, Yusuke Yanagi, Kazuhiro Ito, Hisaya Komen, Manabu Tanaka, Akihisa Murata

    Welding International   37 ( 12 )   718 - 729   2023.7

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    DOI: 10.1080/09507116.2023.2234693

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  • Adapted to generate compressive residual stress and retained austenite in a steel surface layer by friction stir processing with the WC tool

    Hajime Yamamoto, Yuji Yamamoto, Kazuhiro Ito, Yoshiki Mikami

    Proceedings of The 76th IIW Annual Assembly   IX-L-1272-2023   2023.7

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

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  • Strengthening of Al/Cu dissimilar joint due to complicated interface produced by pulsed TIG welding with a constricted nozzle Reviewed

    Hajime Yamamoto, Yusuke Yanagi, Kazuhiro Ito, Hisaya Komen, Manabu Tanaka, Akihisa Murata

    Quarterly Journal of the Japan Welding Society   41 ( 1 )   168 - 177   2023.4

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Japan Welding Society  

    DOI: 10.2207/qjjws.41.168

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  • Orientation dependence of plastic deformation of sintered Nd-Fe-B magnets at high temperature Reviewed

    Mei Liu, Lanting Zhang, Bingbing Zhao, Fugang Chen, Xianshuang Xia, Yongjiang Yu, Hajime Yamamoto, Kazuhiro Ito

    Acta Materialia   244   118559   2022.11

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

    DOI: 10.1016/j.actamat.2022.118559

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  • Toughening due to deformation induced martensitic transformation in delta ferrite-containing austenitic stainless steel weld metals

    Hajime Yamamoto, Reika Oda, Kazuhiro Ito, Hirofumi Maniwa, Yoshihiko Kitagawa, Hirohisa Watanabe

    Proceedings of The 75th IIW Assembly   IX-H-929-2022   2022.7

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

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  • Experimental study on improving the additively manufactured GMAW and TIG beads using FSP Reviewed

    Murshid Imam, Sai Naga Sri Harsha Chittajallu, Himanshu Gururani, Hajime Yamamoto, Kazuhiro Ito, Pradeep Kumar Parchuri, Rajnish Mishra, Abhay Sharma, Ashutosh Richhariya, Viswanath Chinthapenta

    Materials Today: Proceedings   56   690 - 705   2022.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    DOI: 10.1016/j.matpr.2022.01.154

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  • Fatigue strength improvement due to alloying steel weld toes with WC tool constituent elements through friction stir processing Reviewed

    Hajime Yamamoto, Shodai Koga, Kazuhiro Ito, Yoshiki Mikami

    The International Journal of Advanced Manufacturing Technology   119   6203 - 6213   2022.1

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00170-022-08690-7

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  • Microstructure features and formation mechanism in a newly developed electroslag welding Invited Reviewed

    Tomonori Kakizaki, Shodai Koga, Hajime Yamamoto, Yoshiki Mikami, Kazuhiro Ito, Kei Yamazaki, Shuji Sasakura, Hirohisa Watanabe

    Welding in the World   66 ( 2 )   313 - 324   2021.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Springer Science and Business Media LLC  

    Abstract

    Electroslag welding (ESW) is known to show higher heat input than electrogas welding (EGW), resulting in poor low-temperature toughness. However, a newly developed ESW (dev. ESW) method using low-resistivity slag bath exhibited excellent low-temperature toughness as a result of lower effective heat input than conventional EGW, as demonstrated by the faster cooling rates measured in weld metals and estimated using finite element method analyses. This led to much shallower molten pool in the dev. ESW, resulting in much finer columnar grains and thinner centerline axial grains. High cooling speed in the dev. ESW method appeared to contribute to increased acicular ferrite proportion. The uniform microstructure with large acicular ferrite proportion and small number of inclusions in the weld metal permitted the dev. ESW weld metal to possess little variation in Charpy impact energy across the center of weld metal.

    DOI: 10.1007/s40194-021-01215-y

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    Other Link: https://link.springer.com/article/10.1007/s40194-021-01215-y/fulltext.html

  • Alloying a topmost steel-plate layer with WC-tool constituent elements during friction stir processing Reviewed

    Hajime Yamamoto, Yudai Imagawa, Kazuhiro Ito, Ke Chen, Lanting Zhang

    Journal of Manufacturing Processes   69   311 - 319   2021.8

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.jmapro.2021.07.050

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  • Microstructure evolution along build direction for thin-wall components fabricated with wire-direct energy deposition Reviewed

    Janmejay Dattatraya Kulkarni, Suresh Babu Goka, Pradeep Kumar Parchuri, Hajime Yamamoto, Kazuhiro Ito, Suryakumar Simhambhatla

    Rapid Prototyping Journal   27 ( 7 )   1289 - 1301   2021.7

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

    DOI: 10.1108/RPJ-04-2020-0085

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  • Feature of microstructure and its formation mechanism in a newly developed electro slag welding

    Tomonori Kakizaki, Shodai Koga, Hajime Yamamoto, Yoshiki Mikami, Kazuhiro Ito, Kei Yamazaki, Shuji Sasakura, Hirohisa Watanabe

    Proceedings of The 74th IIW on-line Assembly   IX-L-1237-2021   2021.7

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  • Investigation of WC-tool-component solution mechanism arose in a steel surface layer during friction stir processing

    Hajime Yamamoto, Yudai Imagawa, Kazuhiro Ito

    Proceedings of The 74th IIW on-line Assembly   IX-L-1236-2021   2021.7

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  • Characterization of shock wave damages in explosion welded Mo/Cu clads Reviewed

    Pradeep Kumar Parchuri, Shota Kotegawa, Kazuhiro Ito, Hajime Yamamoto, Akihisa Mori, Shigeru Tanaka, Kazuyuki Hokamoto

    Metals   11 ( 3 )   501   2021.3

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

    DOI: 10.3390/met11030501

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  • Friction stir welding of ultrahigh-purity aluminum thin sheets never to lower high conductivity at ultra-low temperature Reviewed

    Hajime Yamamoto, Yusuke Aoyama, Kazuhiro Ito, Tetsuo Yamada, Manabu Tanaka, Hiroaki Hoshikawa, Akira Nagata, Toshiaki Kumagai

    Quarterly Journal of the Japan Welding Society   38 ( 4 )   253 - 262   2020.12

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)  

    DOI: 10.2207/QJJWS.38.253

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  • Surface microstructure modifications of low carbon steel welds produced by low-heat-input friction stir processing Reviewed

    Hajime Yamamoto, Tomohiro Nishiura, Hitomi Nishibata, Mitsuharu Yonemura, Kazuki Fujiwara, Kaori Kawano, Kazuhiro Ito

    Materials Transactions   61 ( 8 )   1613 - 1619   2020.7

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2320/matertrans.MT-M2020117

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  • Metallurgical characterization of penetration shape change in workpiece vibration-assisted tandem-pulsed gas metal arc welding Reviewed

    Habib Hamed Zargari, Kazuhiro Ito, Tsuyoshi Miwa, Pradeep Kumar Parchuri, Hajime Yamamoto, Abhay Sharma

    Materials   13 ( 14 )   3096   2020.7

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

    DOI: 10.3390/ma13143096

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  • Friction stir welding of ultra high-purity aluminium thin sheets never to lower high conductivity at ultra-low temperature Invited

    Hajime Yamamoto, Yusuke Aoyama, Kazuhiro Ito, Tetsuo Yamada, Manabu Tanaka, Hiroaki Hoshikawa, Akira Nagata, Toshiaki Kumagai

    Welding International   34 ( 4-6 )   125 - 137   2020.5

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Informa UK Limited  

    DOI: 10.1080/09507116.2021.1921983

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  • TEM characterization of explosive cladding interfaces between refractory metal (group V or VI) and Cu plates Reviewed

    Pradeep K Parchuri, Makoto Takahashi, Kazuhiro Ito, Hajime Yamamoto, Kazuyuki Hokamoto

    Journal of Smart Processing   8 ( 6 )   261 - 266   2019.12

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    Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Sumart Processing Society for Minerals, Environment and Energy  

    DOI: 10.7791/jspmee.8.261

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  • Cladding of a crack-free W plate on Cu plates using explosive welding at higher collision velocity with lower collision angle Reviewed

    Pradeep K. Parchuri, Shota Kotegawa, Kazuhiro Ito, Hajime Yamamoto, Akihisa Mori, Shigeru Tanaka, Kazuyuki Hokamoto

    Results in Materials   5   100023   2019.9

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

    DOI: 10.1016/j.rinma.2019.100023

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  • Effect of workpiece-vibration on penetration shape change of P-GMA welds

    Kazuhiro Ito, Habib Hamed Zargari, Hajime Yamamoto, Tsuyoshi Miwa, Pradeep Kumar Parchuri, Manish Kumar, Abhay Sharma

    Proceedings of The 72nd IIW Annual Assembly   IX-K-1211-19   2019.7

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  • Effects of microstructural modification by friction stir processing on fracture toughness of low-carbon steel welds Reviewed

    Hajime Yamamoto, Hiroki Izumi, Kazuhiro Ito

    Journal of Smart Processing   8 ( 1 )   29 - 35   2019.4

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:Sumart Processing Society for Minerals, Environment and Energy  

    DOI: 10.7791/jspmee.8.29

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  • Benefits of intermediate-layer formation at the interface of Nb/Cu and Ta/Cu explosive clads Reviewed

    Pradeep K. Parchuri, Shota Kotegawa, Hajime Yamamoto, Kazuhiro Ito, Akihisa Mori, Kazuyuki Hokamoto

    Materials & Design   166 ( 15 )   107610   2019.1

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

    DOI: 10.1016/j.matdes.2019.107610

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  • Application of friction stir processing to weld toe for fatigue strength improvement of high-strength low-alloy steel joint Reviewed

    Hajime Yamamoto, Yoshikazu Danno, Kazuhiro Ito, Yoshiki Mikami, Kazuyuki Kohama, Hidetoshi Fujii

    Welding Letters   36 ( 4 )   1WL - 4WL   2018.12

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2207/QJJWS.36.1WL

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  • Weld toe modification by friction stir processing using a spherical tip tool in high-strength low-alloy steel joints

    Hajime Yamamoto, Yoshikazu Danno, Kazuhiro Ito, Hidetoshi Fujii

    Proceedings of 4th International Conference “Welding and Failure Analysis of Engineering Materials” (WAFA-2018)   A-19   2018.11

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  • Advantages of intermediate-layer formation at the interface of Nb/Cu and Ta/Cu explosive clads over a wavy interface

    Pradeep Kumar Parchuri, Shota Kotegawa, Hajime Yamamoto, Kazuhiro Ito, Akihisa Mori, Kazuyuki Hokamoto

    Proceedings of 4th International Conference “Welding and Failure Analysis of Engineering Materials” (WAFA-2018)   A-32   2018.11

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  • Weld toe modification using spherical-tip WC tool FSP in fatigue strength improvement of high-strength low-alloy steel joints Reviewed

    Hajime Yamamoto, Yoshikazu Danno, Kazuhiro Ito, Yoshiki Mikami, Hidetoshi Fujii

    Materials & Design   160 ( 15 )   1019 - 1028   2018.10

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.matdes.2018.10.036

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  • Effects of heat-affected-zone microstructure and molten-zinc temperature on zinc embrittlement cracking induced by excess tensile stress in low-alloy steels possessing resistance to LME Reviewed

    Hiroshi Muto, Yoshikazu Danno, Hajime Yamatomo, Kazuhiro Ito

    Quarterly Journal of the Japan Welding Society   36 ( 4 )   230 - 237   2018.10

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

    DOI: 10.2207/qjjws.36.230

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  • Effects of microstructural modification using friction stir processing on fatigue strength of butt-welded joints for high-strength steels Reviewed

    Hajime Yamamoto, Kazuhiro Ito

    Materials Sciences and Applications   9 ( 7 )   625 - 636   2018.6

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Scientific Research Publishing, Inc.  

    DOI: 10.4236/msa.2018.97045

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  • Application of friction stir processing to high-tensile-steel welds

    Kazuhiro Ito, Hajime Yamamoto, Tatsuya Okuda, Hiroki Izumi, Makoto Takahashi, Kazuyuki, Kohama, Hidetoshi Fujii

    Proceeding of The Conference of International Welding and Inspection Technology 2017 and the Conference of Thailand Welding and Inspection Technology 2017 (IWIT & TWIT 2017)   12 - 18   2017.11

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  • Application of friction stir processing to high-tensile-steel welds Invited

    Kazuhiro Ito, Hajime Yamamoto, Makoto Takahashi, Kazuyuki, Kohama, Hidetoshi Fujii

    Proceeding of 7th International Conference on Welding Science and Engineering in conjunction with 3rd International Symposium on Computer-Aided Welding Engineering (WSE & CAWE 2017)   263 - 266   2017.10

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  • Study on the microstructure and liquid phase formation in a semisolid gray cast iron Reviewed

    Davi Munhoz Benati, Kazuhiro Ito, Kazuyuki Kohama, Hajime Yamamoto, Eugenio José Zoqui

    Metallurgical and Materials Transactions B   48 ( 5 )   2293 - 2303   2017.6

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    DOI: 10.1007/s11663-017-1018-5

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  • Spherical porous granules in MgO–Fe2O3–Nb2O5 system: In situ observation of formation behavior using high-temperature confocal laser-scanning microscopy Reviewed

    Yoshikazu Suzuki, Hiroya Abe, Hajime Yamamoto, Kazuhiro Ito, Hiroshige Inoue, Mayumi Nakamura

    Journal of the European Ceramic Society   37 ( 16 )   5339 - 5345   2017.6

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    DOI: 10.1016/j.jeurceramsoc.2017.05.056

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  • Increase in fatigue strength of butt-welded high-tensile steel joints by friction stir processing

    Hajime Yamamoto, Kazuhiro Ito, Makoto Takahashi, Kazuyuki Kohama, Hidetoshi Fujii

    Proceedings of 10th International Conference on Trends in Welding Research   875 - 878   2016.10

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  • Increase in fatigue strength and Charpy absorbed energies of TIG-welded SS400 steel plates by friction-stir-processing grain-refinement

    Kazuhiro Ito, Tatsuya Okuda, Hiroki Izumi, Makoto Takahashi, Hajime Yamamoto, Hidetoshi Fujii

    Proceedings of 10th International Conference on Trends in Welding Research   866 - 869   2016.10

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  • In situ observation of semisolid Fe-2.5C-1.5Si gray cast iron Reviewed

    Davi Munhoz Benati, Kazuhiro Ito, Kazuyuki Kohama, Hajime Yamamoto, Eugenio José Zoqui

    Solid State Phenomena   256   63 - 68   2016.9

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    DOI: 10.4028/www.scientific.net/SSP.256.63

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  • Effects of friction-stir-processing grain-refinement on fatigue strength and Charpy absorbed energies of TIG-welded SS400 steel plates

    Kazuhiro Ito, Tatsuya Okuda, Hiroki Izumi, Makoto Takahashi, Hajime Yamamoto, Hidetoshi Fujii

    Proceedings of The 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9)   218 - 222   2016.8

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  • Increase of fatigue strength of high-tensile steel welds with increase of yield stress using friction stir processing

    Ryota Yamasaki, Kazuhiro Ito, Kazuyuki Kohama, Makoto Takahashi, Hajime Yamamoto, Hidetoshi Fujii, Rintaro Ueji, Chiaki Shiga

    Proceedings of 3rd International Conference in Africa and Asia “Welding and Failure Analysis of Engineering Materials” (WAFA-2015)   A-6   2015.11

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  • Investigation of fracture location of T22/T91 dissimilar welds Reviewed

    Salita Petchsang, Isaratat Phung-on, Hidenori Terasaki, Yu-Ichi Komizo, Hajime Yamamoto

    Key Engineering Materials   659   355 - 360   2015.8

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    DOI: 10.4028/www.scientific.net/KEM.659.355

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MISC

  • 引張残留応力を低減あるいは圧縮残留応力に変える表面改質の事例

    伊藤 和博, 山本 啓, 山元 優士, 渡邊 大翔, 田中 努, A.S. Vishunu, Suryakumar S.

    溶接学会第129回界面接合研究委員会, 大阪大学医工東京ブランチ   2025.6

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    Language:Japanese   Publishing type:Research paper, summary (national, other academic conference)  

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  • Report of WELNET evening forum at JWS national meeting in Spring 2024 & Report of the 70th meeting of WELNET steering committee Invited

    Tomoya Asayama, Tsuyoshi Miwa, Tomoki Matsuda, Hajime Yamamoto, Issei Uchino

    Journal of the Japan Welding Society   93 ( 6 )   405 - 406   2024.9

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    Language:Japanese   Publishing type:Meeting report   Publisher:Japan Welding Society  

    DOI: 10.2207/jjws.93.405

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  • Formation of hook-shaped interface in Al/Cu dissimilar thin sheet joint by pulsed TIG welding with a constricted nozzle Invited

    Hajime Yamamoto

    Journal of Light Metal Welding   61 ( 10 )   15 - 21   2023.10

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (scientific journal)  

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  • Interview Invited

    Hajime Yamamoto

    Journal of Light Metal Welding   61 ( 6 )   56 - 57   2023.6

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    Authorship:Lead author   Language:Japanese  

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  • 超高純度アルミニウムのクリーン接合 Invited Reviewed

    山本 啓

    WE-COMマガジン   46   1 - 8   2022.10

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)  

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  • A preface young and energetic professionals –Digital transformation (DX) of welding industries–

    Hajime Yamamoto, Kazuki Kasano, Keigo Tnaka

    Journal of the Japan Welding Society   91 ( 6 )   436 - 436   2022.9

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    Language:Japanese   Publishing type:Book review, literature introduction, etc.   Publisher:Japan Welding Society  

    DOI: 10.2207/jjws.91.436

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  • 摩擦攪拌ツールの摩耗研究から新規表面合金化技術の確立を目指す Invited

    山本 啓

    Sheetmetal ましん&そふと   90   36 - 37   2021.11

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    Language:Japanese   Publishing type:Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)  

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  • Passion of young professionals for welding and joining research -A preface

    Kazuki Kasano, Hajime Yamamoto

    Journal of the Japan Welding Society   90 ( 4 )   256 - 256   2021.6

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    Language:Japanese   Publishing type:Book review, literature introduction, etc.   Publisher:Japan Welding Society  

    DOI: 10.2207/jjws.90.256

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  • WAFA-2018での海外論文発表 Invited

    山本 啓

    生産と技術   71   102 - 102   2019.4

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  • Egg of Welding Invited

    Hajime Yamamoto

    Journal of the Japan Welding Society   87 ( 7 )   523 - 525   2018.11

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    Language:Japanese   Publisher:Japan Welding Society  

    DOI: 10.2207/jjws.87.523

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Presentations

  • 引張残留応力を低減あるいは圧縮残留応力に変える表面改質の事例

    伊藤 和博, 山本 啓, 山元 優士, 渡邊 大翔, 田中 努, A.S. Vishunu, Suryakumar S.

    溶接学会第129回界面接合研究委員会, 大阪大学医工東京ブランチ  2025.6 

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    Event date: 2025.6

    Language:Japanese  

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  • 銅溶接金属中のカーボンナノチューブ分散状態に及ぼすTi添加の影響

    濵名 菜々子, 山本 啓, 高橋 誠, 伊藤 和博

    一般社団法人 溶接学会 2024年度秋季全国大会 

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    Event date: 2024.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 銅溶接金属中へのカーボンナノチューブ添加の検討

    濵名 菜々子, 山本 啓, 伊藤 和博

    一般社団法人 溶接学会 2024年度春季全国大会 

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    Event date: 2024.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 超ハイテン鋼板のアーク溶接継手疲労強度向上に関する研究

    星野 佑介, 伊藤 和博, 山本 啓, Hong Seong Min, 戸田 要, 鈴木 励一

    一般社団法人 溶接学会 2024年度春季全国大会 

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    Event date: 2024.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Alloying of low-carbon steel surface due to friction stir processing with WC tool wear

    Hajime Yamamoto, Yuji Yamamoto, Yudai Imagawa, Kazuhiro Ito, Yoshiki Mikami

    The 3rd Materials Research Meeting (MRM2023) / The 24th IUMRS-International Conference in Asia (IUMRS-ICA2023) 

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    Event date: 2023.12

    Language:English   Presentation type:Oral presentation (general)  

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  • 摩擦攪拌プロセス中の荷重低減とそのWCツール元素固溶量への影響

    山本 啓, 柳 悠輔, 伊藤 和博

    公益社団法人 日本金属学会 2023年秋期(第173回)講演大会 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 加工誘起変態を起こすδフェライト含有γ系溶着金属の横膨出量と吸収エネルギーの関係

    星野 佑介, 小田 怜佳, 伊藤 和博, 山本 啓, Hong Seong Min, 阿部 真弓, 鈴木 正道, 北川 良彦

    一般社団法人 溶接学会 2023年度秋季全国大会 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 摩擦攪拌プロセス中の荷重低減とそのWCツール元素固溶量への影響

    柳 悠輔, 山本 啓, 伊藤 和博

    一般社団法人 溶接学会 2023年度秋季全国大会 

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    Event date: 2023.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Adapted to generate compressive residual stress and retained austenite in a steel surface layer by friction stir processing with the WC tool

    Hajime Yamamoto, Yuji Yamamoto, Kazuhiro Ito, Yoshiki Mikami

    The 76th IIW Annual Assembly and International Conference on Welding and Joining 

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    Event date: 2023.7

    Language:English   Presentation type:Oral presentation (general)  

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  • Low-temperature toughness increase for austenitic stainless steel weld metal for cryogenic use

    Hirofumi Maniwa, Mayumi Abe, Masamichi Suzuki, Yoshihiko Kitagawa, Yusuke Hoshino, Reika Oda, Hajime Yamamoto, Seong Min Hong, Kazuhiro Ito

    The 76th IIW Annual Assembly and International Conference on Welding and Joining 

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    Event date: 2023.7

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  • WCツール摩擦攪拌プロセスにより生成された残留γの疲労き裂進展抵抗への寄与

    山本 啓, 山元 優士, 伊藤 和博

    一般社団法人 溶接学会 2023年度春季全国大会 

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    Event date: 2023.4 - 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • オーステナイト系ステンレス鋼溶接金属の極低温じん性向上に寄与する因子の検討

    星野 佑介, 小田 怜佳, Hong Seong Min, 山本 啓, 伊藤 和博, 馬庭 啓史, 阿部 真弓, 鈴木 正道, 北川 良彦

    一般社団法人 溶接学会 2023年度春季全国大会 

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    Event date: 2023.4 - 2023.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Surface alloying due to WC tool wear during FSP and its effects on the microstructure and mechanical properties of topmost steel layer

    Hajime Yamamoto, Yudai Imagawa, Yuji Yamamoto, Kazuhiro Ito

    TMS 2023 152nd Annual Meeting & Exhibition 

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    Event date: 2023.3

    Language:English   Presentation type:Oral presentation (general)  

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  • WCツール摩擦攪拌プロセス施工面における疲労き裂進展速度に及ぼす残留γの影響

    山本 啓, 山元 優士, 伊藤 和博

    公益社団法人 日本金属学会 2023年春期(第172回)講演大会 

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    Event date: 2023.3

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Addition of compressive residual stress and retained austenite in steel surface layers by friction stir processing with the WC tool

    Hajime Yamamoto, Yuji Yamamoto, Kazuhiro Ito, Yoshiki Mikami

    The 6th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation (Visual-JW 2022) & The 2nd International Symposium on Design & Engineering by Joint Inverse Innovation for Materials Architecture (DEJI2MA) 

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    Event date: 2022.10

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  • Post weld tungsten alloying in a topmost steel layer through friction stir processing using a WC tool Invited

    Kazuhiro Ito, Hajime Yamamoto, Yoshiki Mikami, Makoto Takahashi

    The 6th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation (Visual-JW 2022) & The 2nd International Symposium on Design & Engineering by Joint Inverse Innovation for Materials Architecture (DEJI2MA) 

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    Event date: 2022.10

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • Effect of deformation-induced martensitic transformation on low-temperature toughness in delta ferrite-containing austenitic stainless steel weld metals

    Reika Oda, Hajime Yamamoto, Kazuhiro Ito, Hirofumi Maniwa, Yoshihiko Kitagawa, Hirohisa Watanabe

    The 6th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation (Visual-JW 2022) & The 2nd International Symposium on Design & Engineering by Joint Inverse Innovation for Materials Architecture (DEJI2MA) 

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    Event date: 2022.10

    Language:English   Presentation type:Poster presentation  

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  • Strengthening of Al/Cu dissimilar joint due to complicated interface produced by pulsed TIG welding with a constricted nozzle

    Yusuke Yanagi, Hajime Yamamoto, Kazuhiro Ito, Hisaya Komen, Manabu Tanaka, Akihisa Murata

    The 6th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation (Visual-JW 2022) & The 2nd International Symposium on Design & Engineering by Joint Inverse Innovation for Materials Architecture (DEJI2MA) 

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    Event date: 2022.10

    Language:English   Presentation type:Poster presentation  

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  • WCツール摩擦攪拌プロセスにより鋼表層に生じる圧縮残留応力と残留オーステナイト

    山本 啓, 山元 優士, 伊藤 和博, 三上 欣希

    公益社団法人 日本金属学会 2022年秋期(第171回)講演大会 

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    Event date: 2022.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • WCツール摩擦攪拌プロセスによる鋼表層への圧縮残留応力と残留オーステナイトの付与

    柳 悠輔, 山元 優士, 山本 啓, 伊藤 和博, 三上 欣希

    一般社団法人 溶接学会 2022年度秋季全国大会 

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    Event date: 2022.9

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  • オーステナイト系ステンレス鋼溶接金属の加工誘起マルテンサイト変態による極低温じん性増加に及ぼすMn量の影響

    小田 怜佳, 山本 啓, 伊藤 和博, 馬庭 啓史, 北川 良彦, 渡邉 博久

    一般社団法人 溶接学会 2022年度秋季全国大会 

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    Event date: 2022.9

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  • Toughening due to deformation induced martensitic transformation in delta ferrite-containing austenitic stainless steel weld metals

    Hajime Yamamoto, Reika Oda, Kazuhiro Ito, Hirofumi Maniwa, Yoshihiko Kitagawa, Hirohisa Watanabe

    The 75th IIW Assembly & International Conference 

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    Event date: 2022.7

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  • 狭窄パルスTIG溶接を用いた異相界面複雑化によるAl/Cu接合強度の増加

    山本 啓, 柳 悠輔, 伊藤 和博, 古免 久弥, 田中 学, 村田 彰久

    一般社団法人 溶接学会 2022年度春季全国大会 

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    Event date: 2022.4

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  • オーステナイト系ステンレス鋼溶接金属の加工誘起マルテンサイト変態による極低温じん性増加

    小田 怜佳, 山本 啓, 伊藤 和博, 馬庭 啓史, 北川 良彦, 渡邉 博久

    一般社団法人 溶接学会 2022年度春季全国大会 

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    Event date: 2022.4

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  • Experimental study on improving the additively manufactured GMAW and TIG beads using FSP

    Murshid Imam, Sai Naga Sri, Harsha Chittajallu, Himanshu Gururani, Hajime Yamamoto, Kazuhiro Ito, Pradeep, Kumar Parchuri, Rajnish Mishra, Abhay Sharma, Ashutosh Richhariya, Viswanath Chinthapen

    International Conference on Materials, Mechanics & Modelling 2021 (ICMMM-2021) 

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    Event date: 2022.3

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  • Explosion welding of W/Cu and Mo/Cu clads and related shock wave damages Invited

    Kazuhiro Ito, Pradeep Kumar Parchuri, Shota Kotegawa, Hajime Yamamoto, Akihisa Mori, Kazuyuki Hokamoto

    International Conference on Materials Science and Engineering 2021 

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    Event date: 2021.10

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • Al/Cu異材薄板の狭窄TIG溶接

    山本 啓, 伊藤 和博, 高橋 誠, 田中 学, ヌエン ヴァン アン, 村田 彰久

    公益社団法人 日本金属学会 2021年秋期(第169回)講演大会 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 摩擦攪拌プロセス施工鋼表層の残留応力とWCツール構成元素固溶量との関係

    山元 優士, 山本 啓, 伊藤 和博, 三上 欣希

    一般社団法人 溶接学会 2021年度秋季全国大会 

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    Event date: 2021.9

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  • 摩擦攪拌プロセス施工鋼表層のWCツール構成元素固溶量に及ぼす鋼化学成分の影響

    小田 怜佳, 山本 啓, 伊藤 和博, 高橋 誠

    一般社団法人 溶接学会 2021年度秋季全国大会 

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    Event date: 2021.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Al/Cu異材薄板の狭窄TIG溶接

    山本 啓, 伊藤 和博, 高橋 誠, 田中 学, ヌエン ヴァン アン, 村田 彰久

    一般社団法人 溶接学会 2021年度秋季全国大会 

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    Event date: 2021.9

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  • Investigation of WC-tool-component solution mechanism arose in a steel surface layer during friction stir processing

    Hajime Yamamoto, Yudai Imagawa, Kazuhiro Ito

    The 74th IIW on-line Assembly & International Conference 

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    Event date: 2021.7

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  • Feature of microstructure and its formation mechanism in a newly developed electro slag welding

    Tomonori Kakizaki, Shodai Koga, Hajime Yamamoto, Yoshiki Mikami, Kazuhiro Ito, Kei Yamazaki, Shuji Sasakura, Hirohisa Watanabe

    The 74th IIW on-line Assembly & International Conference 

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    Event date: 2021.7

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  • 摩擦攪拌プロセスによるWCツール構成元素の鋼中固溶機構

    山本 啓, 今川 雄大, 伊藤 和博

    一般社団法人 溶接学会 2021年度春季全国大会 

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    Event date: 2021.4

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  • 摩擦攪拌プロセスによるWCツール構成元素の鋼中固溶機構

    山本 啓, 今川 雄大, 伊藤 和博

    公益社団法人 日本金属学会 2021年春期(第168回)講演大会 

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    Event date: 2021.3

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  • 摩擦攪拌プロセスによる組織改質が低炭素鋼溶接部の破壊靱性に及ぼす影響 Invited

    山本 啓, 和泉 博貴, 伊藤 和博

    一般社団法人 スマートプロセス学会 2020年度学術講演会 

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    Event date: 2020.11

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • 極低温時の高導電率を低下させないための超高純度アルミニウム薄板の摩擦攪拌接合

    山本 啓, 青山 雄亮, 伊藤 和博, 山田 哲生, 田中 学, 星河 浩介, 永田 章, 熊谷 俊昭

    公益社団法人 日本金属学会 2020年秋期(第167回)講演大会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • エレクトロスラグ及びエレクトロガスアーク溶接における溶接金属中のアシキュラーフェライト量に及ぼすプロセス因子の影響

    古賀 将大, 山本 啓, 伊藤 和博, 柿崎 智紀, 山崎 圭, 笹倉 秀司, 渡邉 博久

    一般社団法人 溶接学会 2020年度秋季全国大会 

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    Event date: 2020.9

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  • 極低温時の高導電率を低下させないための超高純度アルミニウム薄板の摩擦攪拌接合

    山本 啓, 青山 雄亮, 伊藤 和博, 山田 哲生, 田中 学, 星河 浩介, 永田 章, 熊谷 俊昭

    一般社団法人 溶接学会 2020年度秋季全国大会 

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    Event date: 2020.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Travel distance of stable WC-tool-wear related W alloying varying with friction stir processing parameters on low-carbon steel plates

    Yudai Imagawa, Hajime Yamamoto, Kazuhiro Ito

    The 5th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation (Visual-JW 2019) & The 8th International Conference of Welding Science and Engineering in conjunction with Symposium on the Research Activities of Joint Usage/Research Center on Joining and Welding 

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    Event date: 2019.11

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  • W alloying due to WC tool wear during friction stir processing for fatigue strength improvement of high-strength low-alloy steel joints

    Shodai Koga, Hajime Yamamoto, Kazuhiro Ito, Makoto Takahashi, Yoshiki Mikami, Hidetoshi Fujii

    The 5th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation (Visual-JW 2019) & The 8th International Conference of Welding Science and Engineering in conjunction with Symposium on the Research Activities of Joint Usage/Research Center on Joining and Welding 

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    Event date: 2019.11

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  • Weld toe modification using friction stir processing for fatigue strength improvement of high-strength low-alloy steel joints

    Hajime Yamamoto, Yoshikazu Danno, Kazuhiro Ito, Yoshiki Mikami, Hidetoshi Fujii

    International Conference on Materials and Systems for Sustainability 2019 (ICMaSS2019) in conjunction with NU-NUS Symposium, Emerging Technologies for Next Generation Electric Power Systems, and International Symposium on Creation of Life Innovation Materials for Interdisciplinary and International Researcher Development Satellite (iLIM-s) 

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    Event date: 2019.11

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  • W alloying due to WC tool wear during friction stir processing for fatigue strength improvement of high-strength low-alloy steel joints

    Shodai Koga, Hajime Yamamoto, Kazuhiro Ito, Makoto Takahashi, Yoshiki Mikami, Hidetoshi Fujii

    The 4th International Symposium on Creation of Life Innovation Materials for Interdisciplinary and International Researcher Development (iLIM-4) in conjunction with The 14th International Workshop on Biomaterials in Interface Science Innovative Research for Biosis-Abiosis Intelligent Interface Seminar 2019 

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    Event date: 2019.10

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  • 摩擦攪拌プロセスによるWCツール構成元素の低炭素鋼表面への供給とその組織形成に及ぼすツール摩耗挙動の影響

    今川 雄大, 山本 啓, 伊藤 和博, 三上 欣希, 藤井 英俊

    一般社団法人 溶接学会 2019年度秋季全国大会 

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    Event date: 2019.9

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  • The benefits of workpiece vibration in tandem pulsed gas metal arc welding

    Habib Hamed Zargari, Kazuhiro Ito, Pradeep Kumar Parchuri, Hajime Yamamoto, Manish Kumar, Abhay Sharma

    公益社団法人 日本金属学会 2019年秋期(第165回)講演大会 

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    Event date: 2019.9

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  • A summary on microstructural features and mechanical properties of explosive welded group V, VI refractory metals Cu clads

    Pradeep Kumar Parchuri, Shota Kotegawa, Kazuhiro Ito, Hajime Yamamoto, Akihisa Mori, Kazuyuki Hokamoto

    公益社団法人 日本金属学会 2019年秋期(第165回)講演大会 

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    Event date: 2019.9

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  • 摩擦攪拌プロセスによるWCツール構成元素の低炭素鋼表面への供給とその組織形成に及ぼすツール摩耗挙動の影響

    今川 雄大, 山本 啓, 伊藤 和博, 三上 欣希, 藤井 英俊

    公益社団法人 日本金属学会 2019年秋期(第165回)講演大会 

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    Event date: 2019.9

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  • Effect of workpiece-vibration on penetration shape change of P-GMA welds

    Kazuhiro Ito, Habib Hamed Zargari, Hajime Yamamoto, Tsuyoshi Miwa, Pradeep Kumar Parchuri, Manish Kumar, Abhay Sharma

    The 72nd IIW Annual Assembly & International Conference 

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    Event date: 2019.7

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  • Mo/Cu爆発圧接クラッド材の曲げ強度と接合界面の関係

    Pradeep Kumar Parchuri, 古手川 将大, 山本 啓, 伊藤 和博, 森 昭寿, 田中 茂, 外本 和幸

    一般社団法人 溶接学会 平成31年度春季全国大会 

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    Event date: 2019.4

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  • 高強度低合金鋼溶接継手止端部への摩擦攪拌プロセスにおける施工条件と疲労強度改善の関係

    古賀 将大, 山本 啓, 伊藤 和博, 三上 欣希, 藤井 英俊

    一般社団法人 溶接学会 平成31年度春季全国大会 

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    Event date: 2019.4

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  • WCツールを用いた摩擦攪拌プロセスによる表面改質と機能性向上 Invited

    伊藤 和博, 山本 啓, 段野 芳和

    公益社団法人 日本金属学会 2019年春期(第164回)講演大会 

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    Event date: 2019.3

    Language:Japanese   Presentation type:Oral presentation (keynote)  

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  • 高強度低合金鋼溶接継手止端部への摩擦攪拌プロセスにおける施工条件と疲労強度改善の関係

    山本 啓, 古賀 将大, 伊藤 和博, 三上 欣希, 藤井 英俊

    公益社団法人 日本金属学会 2019年春期(第164回)講演大会 

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    Event date: 2019.3

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  • Characterization of bending strength and interface microstructure in Mo/Cu explosive clads

    Pradeep Kumar Parchuri, Shota Kotegawa, Hajime Yamamoto, Kazuhiro Ito, Akihisa Mori, Shigeru Tanaka, Kazuyuki Hokamoto

    公益社団法人 日本金属学会 2019年春期(第164回)講演大会 

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    Event date: 2019.3

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  • Direct application of friction stir processing to weld toes of high-strength low-alloy steel joints

    Hajime Yamamoto, Yoshikazu Danno, Kazuhiro Ito, Yoshiki Mikami, Hidetoshi Fujii

    TMS 2019 148th Annual Meeting & Exhibition 

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    Event date: 2019.3

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  • Direct application of friction stir processing to weld toes of high-strength low-alloy steel joints

    Hajime Yamamoto, Yoshikazu Danno, Kazuhiro Ito, Yoshiki Mikami, Hidetoshi Fujii

    The International Symposium for Materials Scientists “Inspiration for Innovation by Interaction” (ISMS III) 

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    Event date: 2018.12

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  • Weld toe modification by friction stir processing using a spherical tip tool in high-strength low-alloy steel joints

    Hajime Yamamoto, Yoshikazu Danno, Kazuhiro Ito, Hidetoshi Fujii

    4th International Conference “Welding and Failure Analysis of Engineering Materials” (WAFA-2018) 

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    Event date: 2018.11

    Language:English   Presentation type:Oral presentation (general)  

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  • Advantages of intermediate-layer formation at the interface of Nb/Cu and Ta/Cu explosive clads over a wavy interface

    Pradeep Kumar Parchuri, Shota Kotegawa, Hajime Yamamoto, Kazuhiro Ito, Akihisa Mori, Kazuyuki Hokamoto

    4th International Conference “Welding and Failure Analysis of Engineering Materials” (WAFA-2018) 

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    Event date: 2018.11

    Language:English   Presentation type:Oral presentation (general)  

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  • Change for better in the penetration shape of twin-wire MAG welds using workpiece vibration Invited

    Kazuhiro Ito, Habib Hamed Zargari, Hajime Yamamoto, Tsuyoshi Miwa, Pradeep Kumar Parchuri, Abhay Sharma, Manish Kumar

    4th International Conference “Welding and Failure Analysis of Engineering Materials” (WAFA-2018) 

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    Event date: 2018.11

    Language:English   Presentation type:Oral presentation (keynote)  

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  • Steel-surface modification by friction stir processing using a WC tool Invited

    Kazuhiro Ito, Hajime Yamamoto, Yoshikazu Danno, Hidetoshi Fujii

    The 3rd International Symposium on Creation of Life Innovation Materials for Interdisciplinary and International Researcher Development (iLIM-3) 

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    Event date: 2018.9

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • Direct application of friction stir processing to weld toes of high-strength low-alloy steel joints

    Hajime Yamamoto, Yoshikazu Danno, Kazuhiro Ito, Yoshiki Mikami, Hidetoshi Fujii

    The 3rd International Symposium on Creation of Life Innovation Materials for Interdisciplinary and International Researcher Development (iLIM-3) 

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    Event date: 2018.9

    Language:English   Presentation type:Poster presentation  

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  • Effect of yttrium addition on phase constitution and mechanical properties of a Ti—Cr—Sn biomedical alloy

    Minsoo Park, Akira Umise, Masaki Tahara, Hajime Yamamoto, Kazuhiro Ito, Hideki Hosoda

    The 3rd International Symposium on Creation of Life Innovation Materials for Interdisciplinary and International Researcher Development (iLIM-3) 

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    Event date: 2018.9

    Language:English   Presentation type:Poster presentation  

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  • Variation in the bending strength with collision velocity in W/Cu explosive welds

    Pradeep Kumar Parchuri, Shota Kotegawa, Hajime Yamamoto, Yoshiki Mikami, Kazuhiro Ito, Shigeru Tanaka, Kazuyuki Hokamoto

    公益社団法人 日本金属学会 2018年秋期(第163回)講演大会 

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    Event date: 2018.9

    Language:English   Presentation type:Oral presentation (general)  

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  • Workpiece vibration in twin-wire MAG welding for the benefit of penetration shape change

    Habib Hamed Zargari, Kazuhiro Ito, Hajime Yamamoto, Pradeep Kumar Parchuri, Abhay Sharma

    公益社団法人 日本金属学会 2018年秋期(第163回)講演大会 

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    Event date: 2018.9

    Language:English   Presentation type:Oral presentation (general)  

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  • 爆発圧接したW/Cu接合体の曲げ特性と爆発圧接時の衝突速度との関係

    古手川 将大, Pradeep Kumar Parchuri, 伊藤 和博, 山本 啓, 田中 茂, 外本 和幸

    一般社団法人 溶接学会 平成30年度秋季全国大会 

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    Event date: 2018.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Metallurgical characterization of penetration shape change in twin-wire MAG welds using workpiece-vibration

    Kazuhiro Ito, Hajime Yamamoto, Pradeep Kumar Parchuri, Abhay Sharma, Habib Hamed Zargari

    The 71st IIW Annual Assembly & International Conference 

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    Event date: 2018.7

    Language:English   Presentation type:Oral presentation (general)  

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  • Advantages of intermediate-layer formation at the interface of Nb/Cu and Ta/Cu explosive clads over a wavy interface

    Pradeep Kumar Parchuri, Shota Kotegawa, Hajime Yamamoto, Kazuhiro Ito, Akihisa Mori, Kazuyuki Hokamoto

    The 71st IIW Annual Assembly & International Conference 

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    Event date: 2018.7

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  • 球面先端形状ツールを用いた摩擦攪拌プロセスによる低炭素鋼溶接余盛止端部組織と形状の改善およびそれらの疲労強度への効果

    山本 啓, 段野 芳和, 伊藤 和博, 三上 欣希, 藤井 英俊

    一般社団法人 溶接学会 平成30年度春季全国大会 

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    Event date: 2018.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 衝突速度と音速との関係が爆発圧接したRMs/Cu界面形状およびその機械的特性に与える影響

    Pradeep Kumar Parchuri, 古手川 将大, 山本 啓, 伊藤 和博, 外本 和幸

    一般社団法人 溶接学会 平成30年度春季全国大会 

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    Event date: 2018.4

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A study on characteristics of explosively welded RMs/Cu joints at different relationship between horizontal-collision and sonic velocities

    Pradeep Kumar Parchuri, Shota Kotegawa, Hajime Yamamoto, Kazuhiro Ito, Kazuyuki Hokamoto

    公益社団法人 日本金属学会 2018年春期(第162回)講演大会 

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    Event date: 2018.3

    Language:English   Presentation type:Oral presentation (general)  

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  • 球面先端形状ツールを用いた摩擦攪拌プロセスによる低炭素鋼溶接余盛止端部の組織および形状改善と疲労強度に及ぼす影響

    山本 啓, 段野 芳和, 伊藤 和博, 三上 欣希, 藤井 英俊

    公益社団法人 日本金属学会 2018年春期(第162回)講演大会 

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    Event date: 2018.3

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Application of friction stir processing to high-tensile-steel welds

    Kazuhiro Ito, Hajime Yamamoto, Makoto Takahashi, Kazuyuki, Kohama, Hidetoshi Fujii

    3rd International Conference on Friction Based Processes (ICFP2017) 

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    Event date: 2017.11

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  • Application of friction stir processing to high-tensile-steel welds

    Kazuhiro Ito, Hajime Yamamoto, Tatsuya Okuda, Hiroki Izumi, Makoto Takahashi, Kazuyuki Kohama, Hidetoshi Fujii

    The Conference of International Welding and Inspection Technology 2017 and The Conference of Thailand Welding and Inspection Technology 2017 (IWIT & TWIT 2017) 

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    Event date: 2017.11

    Language:English   Presentation type:Oral presentation (general)  

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  • Application of friction stir processing to high-tensile-steel welds Invited

    Kazuhiro Ito, Hajime Yamamoto, Makoto Takahashi, Kazuyuki, Kohama, Hidetoshi Fujii

    7th International Conference on Welding Science and Engineering in conjunction with 3rd International Symposium on Computer-Aided Welding Engineering (WSE & CAWE 2017) 

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    Event date: 2017.10

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • Application of friction stir processing to weld toe

    Yoshikazu Danno, Hajime Yamamoto, Kazuhiro Ito, Yoshiki Mikami, Kazuyuki Kohama

    The 2nd International Symposium on Creation of Life Innovation Materials for Interdisciplinary and International Researcher Development (iLIM-2) 

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    Event date: 2017.9 - 2017.10

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  • 過剰応力下低合金鋼での亜鉛脆化割れに及ぼす熱影響部組織・引張応力・溶融亜鉛温度の影響

    武藤 宏, 伊藤 和博, 山本 啓, 段野 芳和

    一般社団法人 溶接学会 平成29年度秋季全国大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • タンデムマグ溶接における溶融池内での溶滴流動に及ぼす被溶接材振動の影響

    山本 啓, 伊藤 和博, 三輪 剛士, Pradeep Kumar Parchuri, Abhay Sharma

    一般社団法人 溶接学会 平成29年度秋季全国大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Correlation between thermo-physical property to microstructure evolution of underwater explosive welds of Mo/Cu and W/Cu

    Pradeep Kumar Parchuri, Shota Kotegawa, Hajime Yamamoto, Kazuhiro Ito, Kazuyuki Hokamoto

    一般社団法人 溶接学会 平成29年度秋季全国大会 

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    Event date: 2017.9

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  • 余盛止端部への摩擦攪拌プロセスの適用とその疲労強度改善効果

    段野 芳和, 山本 啓, 伊藤 和博, 三上 欣希, 小濱 和之

    一般社団法人 溶接学会 平成29年度秋季全国大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • タンデムマグ溶接における溶融池内での溶滴流動に及ぼす被溶接材振動の影響

    山本 啓, 伊藤 和博, 三輪 剛士, Pradeep Kumar Parchuri, Abhay Sharma

    公益社団法人 日本金属学会 2017年秋期(第161回)講演大会 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Variation in bending strength and interface morphology of underwater explosive welded RM/Cu joints

    Pradeep Kumar Parchuri, Shota Kotegawa, Hajime Yamamoto, Kazuhiro Ito, Kazuyuki Hokamoto

    公益社団法人 日本金属学会 2017年秋期(第161回)講演大会 

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    Event date: 2017.9

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  • 溶接余盛止端部への直接摩擦攪拌プロセスが疲労強度へ及ぼす効果

    段野 芳和, 山本 啓, 伊藤 和博, 三上 欣希, 小濱 和之

    公益社団法人 日本金属学会 2017年秋期(第161回)講演大会 

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    Event date: 2017.9

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  • Effects of surface-microstructural modification by friction stir processing on fatigue strength of fusion-welded high-tensile steels

    Hajime Yamamoto, Kazuhiro Ito, Makoto Takahashi, Kazuyuki, Kohama, Hidetoshi Fujii

    Interdisciplinary Symposium for Up-and-coming Material Scientists 2017 (ISUMS 2017) 

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    Event date: 2017.6

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  • 水中衝撃波を用いた第5族金属と銅との異材接合界面評価

    古手川 将大, 山本 啓, Pradeep Kumar Parchuri, 高橋 誠, 伊藤 和博, 外本 和幸

    一般社団法人 溶接学会 平成29年度春季全国大会 

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    Event date: 2017.4

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  • Si/Al混合粉末ろう材のAl蒸発による等温凝固を用いたSiCの低温接合

    小濱 和之, 寺田 俊一, 伊藤 和博, 山本 啓, 篠原 貴彦, 坂元 理絵

    一般社団法人 溶接学会 平成29年度春季全国大会 

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    Event date: 2017.4

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  • 摩擦攪拌プロセスにより微細化された高張力鋼溶接部組織のシャルピー吸収エネルギー

    山本 啓, 段野 芳和, 伊藤 和博, 小濱 和之, 藤井 英俊

    一般社団法人 溶接学会 平成29年度春季全国大会 

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    Event date: 2017.4

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  • 共晶系Si-Alろう材のAl蒸発による等温凝固を用いたSiCの低温接合

    小濱 和之, 寺田 俊一, 伊藤 和博, 山本 啓, 篠原 貴彦, 坂元 理絵

    公益社団法人 日本金属学会 2017年春期(第160回)講演大会 

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    Event date: 2017.3

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  • Characterization of dissimilar bonding of Cu to Ta and Nb by the underwater explosive welding

    Pradeep Kumar Parchuri, Shota Kotegawa, Hajime Yamamoto, Kazuhiro Ito, Kazuyuki Hokamoto

    公益社団法人 日本金属学会 2017年春期(第160回)講演大会 

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    Event date: 2017.3

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  • 摩擦攪拌プロセスにより微細化された高張力鋼溶接熱影響部組織のシャルピー衝撃値

    山本 啓, 段野 芳和, 伊藤 和博, 小濱 和之, 藤井 英俊

    公益社団法人 日本金属学会 2017年春期(第160回)講演大会 

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    Event date: 2017.3

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  • Friction-stir-processing microstructure improvement related to fatigue-strength and Charpy-absorbed-energy increase of TIG-welded SS400 steels Invited

    Kazuhiro Ito, Tatsuya Okuda, Hiroki Izumi, Makoto Takahashi, Kazuyuki, Kohama, Hajime Yamamoto, Hidetoshi Fujii

    TMS 2017 146th Annual Meeting & Exhibition 

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    Event date: 2017.2 - 2017.3

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  • Fatigue-strength increase by friction stir processing between different strength grades of butt-welded high-tensile steels

    Hajime Yamamoto, Kazuhiro Ito, Makoto Takahashi, Kazuyuki, Kohama, Hidetoshi Fujii

    TMS 2017 146th Annual Meeting & Exhibition 

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    Event date: 2017.2 - 2017.3

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  • In-situ observation of semisolid Fe–2.5C–1.5Si gray cast iron

    Davi Munhoz Benati, Kazuhiro Ito, Kazuyuki Kohama, Hajime Yamamoto, Eugenio José Zoqui

    Materials Science & Technology 2016 (MS&T16) 

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    Event date: 2016.10

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  • Investigation on cooling strategies during wire arc additive layer manufacturing Invited

    Abhay Sharma, Jayprakash Sharma, Kazuhiro Ito, Surya S. Kumar, Hajime Yamamoto, Kazuyuki Kohama

    The 4th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation (Visual-JW 2016) in conjunction with Symposium on the Research Activities of Joint Usage / Research Center on Joining and Welding and The 1st International Symposium on Creation of Life Innovation Materials for Interdisciplinary and International Research Researcher Development (iLIM-1) 

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    Event date: 2016.10

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  • Interface-microstructure characterization of dissimilar joints between group 5 refractory metals and copper produced by underwater explosive welding

    Shota Kotegawa, Hajime Yamamoto, Kazuhiro Ito, Kazuyuki Hokamoto

    The 4th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation (Visual-JW 2016) in conjunction with Symposium on the Research Activities of Joint Usage / Research Center on Joining and Welding and The 1st International Symposium on Creation of Life Innovation Materials for Interdisciplinary and International Research Researcher Development (iLIM-1) 

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    Event date: 2016.10

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  • Effects of surface-microstructural modification on fatigue strength of high tensile steel welds by friction stir processing

    Hajime Yamamoto, Kazuhiro Ito, Makoto Takahashi, Kazuyuki Kohama, Hidetoshi Fujii

    The 4th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation (Visual-JW 2016) in conjunction with Symposium on the Research Activities of Joint Usage / Research Center on Joining and Welding and The 1st International Symposium on Creation of Life Innovation Materials for Interdisciplinary and International Research Researcher Development (iLIM-1) 

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    Event date: 2016.10

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  • Increase in fatigue strength and Charpy absorbed energies of TIG-welded SS400 steel plates by friction-stir-processing grain-refinement

    Kazuhiro Ito, Tatsuya Okuda, Hiroki Izumi, Makoto Takahashi, Hajime Yamamoto, Hidetoshi Fujii

    10th International Conference on Trends in Welding Research & 9th International Welding Symposium of Japan Welding Society (9WS) 

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    Event date: 2016.10

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  • Increase in fatigue strength of butt-welded high-tensile steel joints by friction stir processing

    Hajime Yamamoto, Kazuhiro Ito, Makoto Takahashi, Kazuyuki Kohama, Hidetoshi Fujii

    10th International Conference on Trends in Welding Research & 9th International Welding Symposium of Japan Welding Society (9WS) 

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    Event date: 2016.10

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  • 低入熱摩擦攪拌プロセスによる極薄セメンタイト膜に包まれた超微細フェライト粒組織の形成とシャルピー吸収エネルギーの増加

    伊藤 和博, 和泉 博貴, 山本 啓, 高橋 誠, 小濱 和之, 藤井 英俊

    公益社団法人 日本金属学会 2016年秋期(第159回)講演大会 

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    Event date: 2016.9

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  • 摩擦攪拌プロセスが形成したセメンタイト膜に包まれた超微細フェライト粒組織の液体窒素温度におけるシャルピー吸収エネルギーと延性破面 —他の入熱条件と比較して—

    伊藤 和博, 和泉 博貴, 山本 啓, 高橋 誠, 小濱 和之, 藤井 英俊

    一般社団法人 溶接学会 平成28年度秋季全国大会 

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    Event date: 2016.9

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  • Si微粒子ペーストとAlを用いたSiC接合における再溶融温度を高温維持した接合温度低減

    寺田 俊一, 小濱 和之, 山本 啓, 伊藤 和博

    一般社団法人 溶接学会 平成28年度秋季全国大会 

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    Event date: 2016.9

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  • 低合金炭素鋼の溶接部・母材の溶融亜鉛脆化割れに及ぼす負荷応力と組織の影響

    武藤 宏, 段野 芳和, 山本 啓, 伊藤 和博

    一般社団法人 溶接学会 平成28年度秋季全国大会 

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    Event date: 2016.9

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  • ダブルワイヤミグ溶接時の溶融池振動が及ぼす低炭素鋼溶接部の機械特性変化への組織からの評価

    三輪 剛士, 山本 啓, 伊藤 和博, 小濱 和之, Abhay Sharma

    一般社団法人 溶接学会 平成28年度秋季全国大会 

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    Event date: 2016.9

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  • 多孔質マイクロ球状粒子の自発的生成挙動の高温その場観察

    鈴木 義和, 阿部 浩也, 山本 啓, 伊藤 和博, 井上 裕滋, 中村 誠友己

    公益社団法人 日本セラミックス協会 第29 回秋季シンポジウム 

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    Event date: 2016.9

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  • Effects of friction-stir-processing grain-refinement on fatigue strength and Charpy absorbed energies of TIG-welded SS400 steel plates

    Kazuhiro Ito, Tatsuya Okuda, Hiroki Izumi, Makoto Takahashi, Hajime Yamamoto, Hidetoshi Fujii

    The 9th Pacific Rim International Conference on Advanced Materials and Processing (PRICM9) 

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    Event date: 2016.8

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  • 摩擦攪拌プロセスによる高張力鋼突合せ溶接部の引張疲労強度増加

    山本 啓, 伊藤 和博, 小濱 和之, 藤井 英俊

    一般社団法人 溶接学会 平成28年度春季全国大会 

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    Event date: 2016.4

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  • 摩擦攪拌プロセスによる高張力鋼突合せ溶接部の引張疲労強度増加

    山本 啓, 伊藤 和博, 小濱 和之, 藤井 英俊

    公益社団法人 日本金属学会 2016年春期(第158回)講演大会 

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    Event date: 2016.3

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  • Increase of tensile fatigue resistance for high-tensile steel welds using friction stir processing

    Hajime Yamamoto, Kazuhiro Ito, Kazuyuki Kohama

    The 2nd International Symposium of Interactive Materials Science Cadet Program (iSIMSC 2) 

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    Event date: 2015.11

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  • Increase of fatigue strength of high-tensile steel welds with increase of yield stress using friction stir processing

    Ryota Yamasaki, Kazuhiro Ito, Kazuyuki Kohama, Makoto Takahashi, Hajime Yamamoto, Hidetoshi Fujii, Rintaro Ueji, Chiaki Shiga

    3rd International Conference in Africa and Asia “Welding and Failure Analysis of Engineering Materials” (WAFA-2015) 

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    Event date: 2015.11

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  • 摩擦攪拌プロセスによる溶接部疲労強度増加に及ぼす母材強度の影響

    山﨑 亮太, 伊藤 和博, 小濱 和之, 高橋 誠, 山本 啓

    公益社団法人 日本金属学会 2015年秋期(第157回)講演大会 

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    Event date: 2015.9

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  • 摩擦攪拌プロセスによる溶接部疲労強度増加に及ぼす母材強度の影響

    山﨑 亮太, 伊藤 和博, 小濱 和之, 高橋 誠, 山本 啓, 藤井 英俊, 上路 林太郎, 志賀 千晃

    一般社団法人 溶接学会 平成27年度秋季全国大会 

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    Event date: 2015.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • In-situ characterization of transient liquid phase bonding of steel alloys

    Hidenori Terasaki, Hajime Yamamoto, Yu-ichi Komizo

    The 3rd International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation (Visual-JW 2014) 

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    Event date: 2014.11

    Language:English   Presentation type:Poster presentation  

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  • Refinement of the CGHAZ of high-strength steel using Fe–Si–B amorphous sheet

    Hidenori Terasaki, Hajime Yamamoto, Yu-ichi Komizo

    The 5th International Symposium on Advanced Materials Development and Integration of Novel Structured Metallic and Inorganic Materials (AMDI-5) 

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    Event date: 2014.11

    Language:English   Presentation type:Poster presentation  

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  • Fracture toughness increase by friction-stir-processing microstructure modification in TIG-welds of SS400 steels

    Kazuhiro Ito, Hiroki Izumi, Hajime Yamamoto, Makoto Takahashi, Kazuyuki Kohama, Yoshikazu Danno, Hidetoshi Fujii

    The 4th International Symposium on Visualization in Joining & Welding Science through Advanced Measurements and Simulation (Visual-JW 2016) in conjunction with Symposium on the Research Activities of Joint Usage / Research Center on Joining and Welding and The 1st International Symposium on Creation of Life Innovation Materials for Interdisciplinary and International Research Researcher Development (iLIM-1) 

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    Language:English   Presentation type:Poster presentation  

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Industrial property rights

  • ALUMINUM MEMBER AND MANUFACTURING METHOD THEREOF

    ITO Kazuhiro, YAMAMOTO Hajime, NAGATA Akira, HOSHIKAWA Hiroaki

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    Application no:202180059555.1  Date applied:2023.1

    Patent/Registration no:ZL202180059555.1  Date registered:2024.12 

    Country of applicant:Foreign country   Country of acquisition:Foreign country

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  • アルミニウム部材およびその製造方法

    伊藤 和博, 山本 啓, 永田 章, 星河 浩介

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    Application no:特願2020-129167  Date applied:2020.7

    Announcement no:特開2022-25955  Date announced:2022.2

    Date registered:2022.2 

    Country of applicant:Domestic  

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Awards

  • 優秀論文賞

    2025.5   (公財) マザック財団  

    山本 啓

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  • 接合科学共同利用・共同研究賞

    2021.9   国立大学法人 大阪大学 接合科学研究所   爆発圧接法によって接合された高融点金属薄板材料の異材接合界面の組織評価

    外本 和幸, 田中 茂, 伊藤 和博, 山本 啓, 高橋 誠

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  • 溶接学会論文奨励賞

    2021.4   一般社団法人 溶接学会   極低温時の高導電率を低下させないための超高純度アルミニウム薄板の摩擦攪拌接合

    山本 啓

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  • 2020年度溶接学会全国大会優秀研究発表賞

    2020.12   一般社団法人 溶接学会   極低温時の高導電率を低下させないための超高純度アルミニウム薄板の摩擦攪拌接合

    山本 啓

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  • 論文賞

    2020.11   一般社団法人 スマートプロセス学会   摩擦攪拌プロセスによる組織改質が低炭素鋼溶接部の破壊靭性に及ぼす影響

    山本 啓, 和泉 博貴, 伊藤 和博

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  • Excellent Presentation Award

    2019.11   International Symposium on Creation of Life Innovation Materials for Interdiscriplinary and International Researcher Development Satellite (iLIM-s)   Weld Toe Modification using Friction Stir Processing for Fatigue Strength Improvement of High-Strength Low-Alloy Steel Joint

    Hajime Yamamoto, Yoshikazu Danno, Kazuhiro Ito, Yoshiki Mikami, Hidetoshi Fujii

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  • 平成30年度 界面接合研究賞

    2019.5   一般社団法人 溶接学会 界面接合研究委員会   FSPによる高張力鋼溶接止端部の表面改質が及ぼす種々の効果について

    山本 啓, 段野 芳和, 今川 雄大, 伊藤 和博

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  • 海外論文発表奨励賞

    2018.10   一般社団法人 生産技術振興会  

    山本 啓

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    Country:Japan

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  • 平成28年度 溶接冶金研究委員会 優秀研究賞

    2017.5   一般社団法人 溶接学会 溶接冶金研究委員会   摩擦攪拌プロセスによる高張力鋼溶接部の組織改質とその疲労強度増加効果

    山本 啓

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Research Projects

  • IMCフリーな異材接合界面の形成に向けた高濃度多元系溶接材料の探索

    2023.4 - 2024.3

    一般社団法人 日本溶接協会  2023年度 次世代を担う研究者助成事業 

    山本 啓

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    Authorship:Principal investigator 

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  • ハイエントロピー効果を活用した金属間化合物フリーAl/Fe異種金属接合

    Grant number:2022-RD-05  2023.4 - 2024.3

    公益財団法人 三五ものづくり基金  2022年度(第3回) 助成事業  研究開発助成

    山本 啓

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    Authorship:Principal investigator 

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  • 摩擦攪拌加工におけるツール摩耗因子の明確化と新規ツール材料の開発

    Grant number:2021-RD-03  2022.4 - 2023.3

    公益財団法人 三五ものづくり基金  2021年度(第2回) 助成事業  研究開発助成

    山本 啓

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  • Simultaneous control of surface microstructure and residual stress using solid solution of tool elements during friction stir processing

    Grant number:21K14438  2021.4 - 2024.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Early-Career Scientists

    Hajime Yamamoto

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    Authorship:Principal investigator 

    Grant amount:\4550000 ( Direct Cost: \3500000 、 Indirect Cost:\1050000 )

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  • 摩擦攪拌中のツール摩耗を利用した鋼表面への局所的合金化手法の開発

    2021.1 - 2021.12

    公益財団法人 JFE21世紀財団  2020年度 技術研究助成  鉄鋼技術研究

    山本 啓

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  • 鉄鋼材料における摩擦攪拌加工中のツール摩耗を利用した表面合金化技術の開発

    Grant number:AF-2020032-C2  2020.9 - 2023.3

    公益財団法人 天田財団  2020年度 研究開発助成 奨励研究助成 (若手研究者) 

    山本 啓

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  • Development of local surface alloying method using tool wear during friction stir processing

    Grant number:19K23575  2019.8 - 2021.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Research Activity Start-up

    Hajime Yamamoto

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    Authorship:Principal investigator 

    Grant amount:\2860000 ( Direct Cost: \2200000 、 Indirect Cost:\660000 )

    Friction stir processing (FSP) is an effective surface modification technique to refine and homogenize microstructures in a solid state for various metallic materials. However, the tool wear has been considered as the unavoidable issue in FSP of high strength materials. In this study, the effects of tool constituent elements added to several steels due to WC tool wear during FSP on the microstructural evolution were investigated, and a new alloying process was developed based on the phenomenon. In addition, in order to clarify the alloying mechanism, a tool/steel interface frozen during FSP was observed. It was found that the compound layer was generated by the reaction of WC particles and Fe atoms on the steel side and decomposed under high temperature and high pressure, followed by the W and C dissolution into the steel matrix.

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Teaching Experience

  • Exercises in Information Science and Technology

    2024 - Present Institution:School of Engineering, Osaka University

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  • A Door to Academia (Manufacturing Science in JWRI (Type2))

    2023 - Present Institution:Center for Education in Liberal Arts and Sciences, Osaka University

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  • Exercises in Information Science and Technology

    2023 Institution:School of Engineering, Osaka University

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  • Experiments and Exercises of Project Based Learning in Manufacturing Science

    2021 Institution:School of Engineering, Osaka University

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  • A Door to Academia (Manufacturing Science in JWRI (Type2))

    2019 - 2021 Institution:Center for Education in Liberal Arts and Sciences, Osaka University

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  • Exercises in Information Science and Technology

    2019 - 2020 Institution:School of Engineering, Osaka University

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