Koyama Motomichi

コヤマモトミチ | Koyama Motomichi

Affiliation and department：
Homepage URL (1)： https://akiyamaimr.amebaownd.com/

Research field (1)： Metallic materials

Research keywords (5)：金属疲労 , 微小損傷 , マルテンサイト , 水素脆化 , 鉄鋼

Research theme for competitive and other funds (19)：

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Papers (282)：

Hiroshi Kakinuma, Sachiko Hiromoto, Tomohiko Hojo, Saya Ajito, Motomichi Koyama, Eiji Akiyama. Mechanism of local hydrogen entry into Fe sheets induced by atmospheric corrosion: Significance of potential, pH, and rust layer thickness. Corrosion Science. 2024. 232. 112043-112043
Hiroshi Kakinuma, Saya Ajito, Motomichi Koyama, Eiji Akiyama. Microscopic visualization of hydrogen diffusion in UNS S32750 super duplex stainless steel: Roles of crystal structure and grain size. International Journal of Hydrogen Energy. 2024. 59. 866-873
Md Shahrier Hasan, Mehmet Fazil Kapci, Burak Bal, Motomichi Koyama, Hadia Bayat, Wenwu Xu. An atomistic study on the HELP mechanism of hydrogen embrittlement in pure metal Fe. International Journal of Hydrogen Energy. 2024. 57. 60-68
Daisuke Sasaki, Yuki Kusaba, Motomichi Koyama. Hydrogen-assisted localized plasticity driven by dislocation pinning-depinning: Finite element simulations. International Journal of Hydrogen Energy. 2024. 56. 280-288
Hiroshi Kakinuma, Saya Ajito, Tomohiko Hojo, Motomichi Koyama, Eiji Akiyama. In situ visualization of misorientation-dependent hydrogen diffusion at grain boundaries of pure polycrystalline Ni using a hydrogen video imaging system. Acta Materialia. 2024. 263. 119536-119536

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MISC (26)：

高井健一, 松本龍介, 松永久生, 小山元道, 小川祐平, 柴田曉伸, 荒河一渡, 武富紳也, 藤浪眞紀. New Developments in Elucidation of Hydrogen Embrittlement Phenomena from the Incubation Stage to Fracture. ふぇらむ. 2023. 28. 4
諸岡聡, 川崎卓郎, ステファヌスハルヨ, 山下享介, 小山元道, 澤口孝宏, 芳賀芳範. Low-temperature behavior analysis of 5Mn-0.1C steel by in-situ neutron diffraction. 材料とプロセス(CD-ROM). 2022. 35. 2
小山元道, VARANASI Rama Srinivas, 北條智彦, 山下享介, 諸岡聡, 川崎卓郎, ステファヌスハルヨ. Multi-scale characterization of Lueders band propagation in a medium Mn steel. 材料とプロセス(CD-ROM). 2022. 35. 2
諸岡聡, 山下享介, 小山元道, 城鮎美, 冨永亜希, 菖蒲敬久. Lueders deformation of 5Mn-0.1C Steels Monitored by In-situ Synchrotron X-ray Diffraction under Tensile Loading. 材料とプロセス(CD-ROM). 2022. 35. 1
Motomichi Koyama, Hiroshi Noguchi, Kaneaki Tsuzaki. Microstructural Crack Tip Plasticity Controlling Small Fatigue Crack Growth. The Plaston Concept. 2022. 213-234

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Patents (1)：

Lectures and oral presentations (25)：

Hydrogen embrittlement of metastable austenitic steels
(MRM2023/IUMRS-ICA2023 Grand Meeting 2023)
Interactions among hydrogen-transformation-crack in metastable austenitic steels
(NIMS award symposium 2023 2023)
Microstructural path and mechanisms of hydrogen-assisted fatigue crack growth of tempered martensitic steels with different tensile strengths
(Pacific Rim International Conference on Advanced Materials and Processing 2023)
Hydrogen Embrittlement of High-Entropy Alloys: Cases of Monotonic Tension and Fatigue
(International Hydrogen Conference 2023)
Characteristics of local plasticity and boundary character in hydrogen-assisted intergranular and intergranular-like fracture paths
(ICSI2023 2023)

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Professional career (1)：

Committee career (2)：

Awards (18)：

2024/03 - Sawamura Award for distinguished papers Hierarchical deformation heterogeneity during Lüders band propagation in an Fe-5Mn-0.1C medium Mn steel clarified through in situ scanning electron microscopy
2023/09 - The Best Paper Award Crack tip deformation during dwell fatigue and its correlation with crack/fracture surface morphologies in a bi-modal Ti-6Al-4V alloy
2023/08 - European Structural Integrity Society (ESIS) Robert Moskovic Award Recognition of an outstanding contribution to Material Resistance to Hydrogen Cracking
2022/04 - 文部科学省文部科学大臣表彰若手科学者賞高強度鉄鋼材料の寿命決定因子に関する研究
2022/03 - The Japan Institute of Metals and Materials Metallograph award

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Association Membership(s) (3)：

THE JAPAN SOCIETY OF MECHANICAL ENGINEERS , THE JAPAN INSTITUTE OF METALS AND MATERIALS , THE IRON AND STEEL INSTITUTE OF JAPAN

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