Microscopic study on the effect of hydrogen on fatigue crack growth process in a chromium-molybdenum steel

Y. Takahashi, K. Yamaguchi, M. Shigenaga, Masaki Tanaka, K. Higashida, Hiroshi Noguchi

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

The effect of hydrogen atmosphere on the fatigue crack propagation property of JIS SCM435 chromium-molybdenum steel is investigated. The magnitude of fatigue crack propagation rate, da/dN, is significantly larger in hydrogen atmosphere than in helium atmosphere. The fracture surface and the near-tip cross-section are observed in detail by SEM and TEM respectively. The microscopic observations suggest that the fatigue crack propagation in helium is transgranular and dominated by plastic process. On the other hand, the fatigue crack propagation in hydrogen is brittle cracking along interface of grain and/or sub-grain structures. The crack seems to advance by unstable growth accompanied frequently by branching or deviation, which eventually results in the relatively large growth rate.

本文言語英語
ホスト出版物のタイトル12th International Conference on Fracture 2009, ICF-12
ページ2416-2423
ページ数8
出版ステータス出版済み - 12 1 2009
イベント12th International Conference on Fracture 2009, ICF-12 - Ottawa, ON, カナダ
継続期間: 7 12 20097 17 2009

出版物シリーズ

名前12th International Conference on Fracture 2009, ICF-12
3

その他

その他12th International Conference on Fracture 2009, ICF-12
Countryカナダ
CityOttawa, ON
Period7/12/097/17/09

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology

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