[2I01-07] Stainless Steel

[2I05] Fundamental technology development for evaluation of thermally ageing embrittlement of stainless steel welds used as pressure boundaries in nuclear power plants

(2)Thermal aging behavior of stainless steel welds

*Hiroshi ABE¹, Yutaka Watanabe¹, Yoichi Takada¹, Toshiaki Horiuchi², Satoshi Minamoto³ (1. Tohoku University, 2. Hokkaido University of Science, 3. NIMS)

Keywords:weld metal, thermal embrittlement, austenitic stainless steels

Hardening behavior of ferrite phase in thermally aged austenitic stainless steel welds was investigated. Nanometer-scaled characterization of microstructure was also carried out to evaluate spinodal decomposition. It has been suggested that solidification mode affected age-hardening behavior of ferrite phase.