[2I01-07] Stainless Steel

[2I07] Fundamental technology development for evaluation of thermally ageing embrittlement of stainless steel welds used as pressure boundaries in nuclear power plants

(4)Development of spinodal decomposition prediction model

*Satoshi Minamoto¹, Yutaka Watanabe², Youichi Takeda², Hiroshi Abe², Toshiaki Horiuchi³ (1. National Institute for Materials Science , 2. Tohoku Univ., 3. Hokkaido University of Science)

Keywords:Spinodal decomposition, CALPHAD, thermodynamic calculation

The Fe-Cr binary system is known as a typical example of causing spinodal decomposition, but thermodynamic study when atomic vacancies are excessively introduced by irradiation has not so far been done. In this study, it is assumed that the vacancies exist excessively in the BCC phase, after adjusting the thermodynamic parameters for phase equilibrium state calculation, investigation on the spinodal decomposition for the binary system has performed.