[1C04-07] Stainless Steel 1

[1C05] Fundamental technology development for evaluation of thermally ageing embrittlement of stainless steel welds used as pressure boundaries in nuclear power plants

(6)Effects of thrmal aging and neutron irradiation on microstructural changes of stainless steel welds

*Hiroshi Abe¹, Yutaka Watanabe¹, Kazuma Hirata¹, Takamichi Miyazaki¹, Masato Koshiishi⁴, Toshiaki Horiuchi², Satoshi Minamoto³ (1. Tohoku Univ, 2. Hokkaido University of Science, 3. NIMS, 4. NFD)

Keywords:Austenitic stainless steels, Weld metal, Thermal embrittlement

The hardening behavior and microstructural changes in ferrite phase of thermally aged austenitic stainless steel welds were investigated. The results of atom probe tomography characterization suggested that spinodal decomposition and G-phase formation were accelerated in the aged and irradiated welds in comparison with only aged welds.