Study on Magnetic Property Change on Neutron Irradiated Austenitic Stainless Steel
根本 義之 Yoshiyuki NEMOTO 大石 誠 Makoto OHISHI 伊藤 正泰 Masayasu ITO 加治 芳行 Yoshiyuki KAJI 欅田 理 Satoshi KEYAKIDA
AC Magnetization MethodAustenitic Stainless SteelEddy Current MethodFE-TEMRadiation Damage
Authors previously reported that magnetic data obtained by using Eddy current method and AC magnetization method showed correlation with the increase of susceptibility of the irradiation assisted stress corrosion cracking (IASCC) on neutron irradiated austenitic stainless alloy specimens. To discuss the mechanism of the correlation, microstructure observation was conducted on the irradiated specimen, and this result, magnetic the permalloy radiation induced phase (FeNimagnetic 3) formation phase formation along grain along boundary grain boundary was revealed seems in this to be work. a factor From of the magnetic property change of the irradiated materials, and related to the correlation between magnetic data and IASCC susceptibility. In addition, sensor probe development was conducted in this work to obtain higher sensitivity and resolution. It was applied for magnetic measurement on type304 stainless steel irradiated up to different doses. In this case, magnetic ferrite phase was existed in the type304 stainless steel sample before irradiation therefore it was concerned that magnetic measurement on the irradiated ones would be disturbed by the magnetic signal from the pre-existing ferrite phase. In the magnetic measurements, increase of the magnetic data was clearly seen on the irradiated specimens. Thus, it was thought that the developed magnetic measurement technics can be applied for the irradiated austenite stainless steels which contain certain quantity of ferrite phase before irradiation.