A Study of Correlativity between IASCC Susceptibility and Magnetic Property of Stainless Steel
根本 義之 Yoshiyuki NEMOTO 欅田 理 Satoshi KEYAKIDA 内一 哲哉 Tetsuya UCHIMOTO 塚田 隆 Takashi TSUKADA
AC Magnetization Method Austenitic Stainless Steel Eddy Current Method IASCC TEM
Authors previously reported leakage magnetic flux density measured by flux gate (FG) sensor seems to depend on irradiation assisted stress corrosion cracking (IASCC) susceptibility of neutron irradiated austenitic stainless steels. This study aimed to evaluate possibility to develop diagnostic method to detect symptom of IASCC by more practical methods such as Eddy current method and AC magnetization method. Magnetic properties of neutron irradiated specimens and mockup specimens were studied and dependence on IASCC susceptibility was revealed. Microstructure observation using transmission electron microscope (TEM) was conducted to study magnetic phase formation by radiation induced segregation (RIS). It was shown that measurement of magnetic signal changed by magnetic phase formation along grain boundaries caused by RIS would be a mechanism of the diagnostic method to detect symptom of IASCC.