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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publication12th International Conference on Fracture 2009, ICF-12
Pages2416-2423
Number of pages8
Publication statusPublished - Dec 1 2009
Event12th International Conference on Fracture 2009, ICF-12 - Ottawa, ON, Canada
Duration: Jul 12 2009Jul 17 2009

Publication series

Name12th International Conference on Fracture 2009, ICF-12
Volume3

Other

Other12th International Conference on Fracture 2009, ICF-12
CountryCanada
CityOttawa, ON
Period7/12/097/17/09

All Science Journal Classification (ASJC) codes

  • Geotechnical Engineering and Engineering Geology

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