Crack initiation resistance characterization of weld by small-punch test in boiling water reactor environment

Jerome Isselin, Tetsuo Shoji

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Crack initiation resistance tests of a type 316L stainless steel weld were performed in high temperature and high pressure water. Small-punch test specimens were used under trapezoidal loading. This survey showed that there are two crack initiation modes in such conditions. The crack initiation at the slip line was promoted by a gradient in term of oxide film composition and in term of local environment (water chemistry). The crack initiation at inclusions was promoted by a local dissolution creating geometric default. The heat affected zone specimen presented the highest probability of initiation with the highest probability to have the longest crack according to the Poisson distribution. These phenomena were attributed to the residual stress that enhanced: (1) a deformation at the micro scale very irregular promoting an instability of the oxide film; (2) the diffusion of Fe producing the formation Fe 3O 4 associated with α-Fe 2O 3..

Original languageEnglish
Pages (from-to)22-28
Number of pages7
JournalInternational Journal of Pressure Vessels and Piping
Volume93-94
DOIs
Publication statusPublished - 2012 May 1

Keywords

  • Miniaturized specimen
  • Small-punch test
  • Stainless steel
  • Yield strength

ASJC Scopus subject areas

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

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