Characterization of microstructure, local deformation and microchemistry in Alloy 600 heat-affected zone and stress corrosion cracking in high temperature water

Zhanpeng Lu, Tetsuo Shoji, Seiya Yamazaki, Kazuhiro Ogawa

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

With increasing the distance from the weld fusion line in an Alloy 600 heat-affected zone, kernel average misorientation decreases and the fraction of Σ3 boundaries increases. Cr 7C 3 carbides mainly precipitate at random high angle boundaries. Chromium depletion and segregation of boron and phosphorous at grain boundaries are observed. Alloy 600 heat-affected zone specimens exhibit higher intergranular stress corrosion cracking growth rates than that in the base metal in simulated pressurized water reactor water environments. Crack growth rate is enhanced by strain hardening and by increasing temperature. The role of stress on interface oxidation kinetics is analyzed.

Original languageEnglish
Pages (from-to)211-228
Number of pages18
JournalCorrosion Science
Volume58
DOIs
Publication statusPublished - 2012 May 1

Keywords

  • A. Superalloy
  • B. SEM
  • C. Hardening
  • C. Reactor conditions
  • C. Stress corrosion
  • C. Welding

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

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