Effect of helium on fatigue crack growth and life of reduced activation ferritic/martensitic steel

Shuhei Nogami, Manabu Takahashi, Akira Hasegawa, Masanori Yamazaki

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7 Citations (Scopus)

Abstract

The effects of helium on the fatigue life, micro-crack growth behavior up to final fatigue failure, and fracture mode under fatigue in the reduced activation ferritic/martensitic steel, F82H IEA-heat, were investigated by low cycle fatigue tests at room temperature in air at a total strain range of 0.6-1.5%. Significant reduction of the fatigue life due to helium implantation was observed for a total strain range of 1.0-1.5%, which might be attributable to an increase in the micro-crack propagation rate. However, the reduction of fatigue life due to helium implantation was not significant for a total strain range of 0.6-0.8%. A brittle fracture surface (an original point of micro-crack initiation) and a cleavage fracture surface were observed in the helium-implanted region of fracture surface. A striation pattern was observed in the non-implanted region. These fracture modes of the helium-implanted specimen were independent of the strain range.

Original languageEnglish
Pages (from-to)S43-S47
JournalJournal of Nuclear Materials
Volume442
Issue number1-3 SUPPL.1
DOIs
Publication statusPublished - 2013

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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