Effect of gaseous hydrogen on cyclic slip behavior around a fatigue crack tip in Fe-3.2 wt.%Si single-crystalline alloy

Yoshimasa Takahashi, Masaki Tanaka, Kenji Higashida, Keigo Yamaguchi, Hiroshi Noguchi

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Abstract

Fatigue crack propagation tests using a single-crystalline Fe-3.2 wt.%Si alloy are conducted for the purpose of investigating the effect of hydrogen gas on cyclic slip around the crack tip. The crack propagation rate is found to be larger in hydrogen gas than in non-hydrogen (helium) gas. The fracture surface and the near-tip cross-section of {110} crack are observed in detail by using a scanning electron microscope (SEM) and a transmission electron microscope (TEM), respectively. The observation reveals that, in helium atmosphere, the propagation is attributed solely to a ductile plastic rocess. In hydroen atmosphere, the propagation can be also attributed to a ductile plastic process except that the amount of plastic deformation is small and the cyclic slip is concentrated around the crack tip region. Different types of slip systems are found to be operative in helium and in hydrogen gas atmospheres, which is postulated to be correlated to the slip concentration and the increased propagation rate.

Original languageEnglish
Pages (from-to)1082-1089
Number of pages8
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume75
Issue number756
DOIs
Publication statusPublished - Aug 2009

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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