Fatigue crack initiation in proton-irradiated austenitic stainless steel

Shuhei Nogami, Yuki Sato, Akira Hasegawa

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The effect of irradiation on slip band formation and growth and microcrack initiation behavior under low cycle fatigue in SUS316L austenitic stainless steel was investigated using accelerator-based proton irradiation and a low cycle fatigue test at room temperature in air. The mean space of the slip line in proton-irradiated specimens was 25-40% wider than that in unirradiated specimens under the same number of cycles, possibly due to localized deformation by proton irradiation. The microcrack initiation life of the proton-irradiated specimens was approximately 20% of that of the unirradiated specimens. While the microcrack initiation in the unirradiated specimens was observed at the grain boundary, twin boundary, slip band, and triple junction, that in the proton-irradiated specimens was observed only at the twin boundary and slip band, possibly due to irradiation hardening. The step-height of an extrusion near the microcrack was almost the same in the unirradiated and proton-irradiated specimens regardless of the initiation site (100-150 nm). Therefore, the microcrack initiation was considered to occur when the surface morphology change involving the extrusion exceeded the specific threshold value.

Original languageEnglish
Pages (from-to)1265-1271
Number of pages7
Journaljournal of nuclear science and technology
Issue number9
Publication statusPublished - 2011


  • Austenitic stainless steel
  • Coarse slip
  • Crack initiation
  • Fatigue
  • Grain boundary
  • Proton irradiation
  • Slip band
  • Triple junction
  • Twin boundary

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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