Motomichi Koyama

Assistant Professor

National University Corporation Kyushu University, Strength of materials

Websitehttp://hyoka.ofc.kyushu-u.ac.jp/search/details/K005262/index.html

1831 Citations
24 h-Index

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Research Output 2007 2019

1831 Citations
24 h-Index
124 Article
4 Conference contribution
4 Review article
2 Letter

Resistance to mechanically small fatigue crack growth in ultrafine grained interstitial-free steel fabricated by accumulative roll-bonding

Lin, X., Koyama, M., Gao, S., Tsuji, N., Tsuzaki, K. & Noguchi, H., Jan 1 2019, In : International Journal of Fatigue. 118, p. 117-125 9 p.

Research output: Contribution to journal › Article

Roll bonding

Fatigue Crack Growth

Steel

Fatigue crack propagation

Fatigue

An unconventional hydrogen effect that suppresses thermal formation of the hcp phase in fcc steels

Koyama, M., Hirata, K., Abe, Y., Mitsuda, A., Iikubo, S. & Tsuzaki, K., Dec 1 2018, In : Scientific reports. 8, 1, 16136.

Research output: Contribution to journal › Article

Steel

Hydrogen

Hot Temperature

Thermodynamics

Iron

4 Citations

Comparative study of hydrogen embrittlement in stable and metastable high-entropy alloys

Ichii, K., Koyama, M., Tasan, C. C. & Tsuzaki, K., Jun 1 2018, In : Scripta Materialia. 150, p. 74-77 4 p.

Research output: Contribution to journal › Article

hydrogen embrittlement

Hydrogen embrittlement

Entropy

entropy

Hydrogen

1 Citations

Ductile-to-brittle transition in tensile failure due to shear-affected zone with a stress-concentration source: a comparative study on punched-plate tensile-failure characteristics of precipitation-hardened and dual-phase steels

Hamada, S., Zhang, J., Zhang, K., Koyama, M., Tsuchiyma, T., Yokoi, T. & Noguchi, H., Aug 1 2018, In : International Journal of Fracture. 212, 2, p. 237-248 12 p.

Research output: Contribution to journal › Article

Stress Concentration

Comparative Study

Stress concentration

Steel

Crack

ECCI Characterization of Dislocation Structures at a Non-propagating Fatigue Crack Tip: Toward Understanding the Effects of Mn-C and Cr-N Couples on Crack Growth Resistance

Habib, K., Koyama, M., Tsuchiyma, T. & Noguchi, H., Jan 1 2018, (Accepted/In press) In : Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science.

Research output: Contribution to journal › Article

Steel

crack tips

Crack tips

Crack propagation

cracks