A Study of testing method for non distractive monitoring of IASCC susceptibility

Nemoto, Yoshiyuki  ; Miwa, Yukio; Takaya, Shigeru  ; Ebine, Noriya ; Tsukada, Takashi ; Uchimoto, Tetsuya*; Keyakida, Satoshi*

Authors reported previously that magnetic parameter seems to depend on irradiation assisted stress corrosion cracking susceptibility of high purity model austenitic stainless steels. This study aimed to investigate mechanism of the dependence. Electron diffraction patterns obtained by transmission electron microscopy were evaluated to study precipitation in irradiated specimens. Influence of element segregation on electro magnetic property of austenitic stainless steel was investigated applying mockup specimens. It was shown that magnetic phases were formed in irradiated austenitic stainless steels. Mockup experiments showed that radiation induced segregation can bring magnetic phase formation along grain boundaries. The magnetic phase was thought to involve with mechanism of magnetic parameter dependence on irradiation assisted stress corrosion cracking susceptibility.