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Effect of Long-Term Thermal Aging on SCC Initiation Susceptibility in Low Carbon Austenitic Stainless Steels

  • So AokiEmail author
  • Keietsu Kondo
  • Yoshiyuki Kaji
  • Masahiro Yamamoto
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

The objective of this study was to clarify the effect of long-term thermal aging on SCC initiation susceptibility in low carbon austenitic stainless steels. Specimens used were Type 304L and 316L austenitic stainless steels. Both steels were cold worked to 20% thickness reduction (CW) followed by long-term thermal aging at 288 °C for 14,000 h (LTA). Creviced Bent Beam (CBB) testing was carried out to estimate the SCC initiation susceptibility under BWR simulated water condition at high temperature. The results of the CBB tests showed that Type 304L specimens with CW and LTA treatment exhibited no SCC susceptibility. In contrast, the SCC initiation susceptibility of Type 316L increased by the combination of cold work and long-term thermal aging. To understand these results, evaluations on the changes of microchemistry, microstructure and mechanical properties induced by the CW and LTA treatment have been performed, and their correlation with the SCC initiation susceptibility was discussed.

Keywords

Low-carbon austenitic stainless steel Stress corrosion cracking Long-term thermal aging Cold work Creviced bent beam (CBB) test 

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  • So Aoki
    • 1
    Email author
  • Keietsu Kondo
    • 1
  • Yoshiyuki Kaji
    • 1
  • Masahiro Yamamoto
    • 1
  1. 1.Japan Atomic Energy Agency, Nuclear Science and Engineering CenterNaka-GunJapan

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