BWR 環境で長期使用されたステンレス鋳鋼のミクロ組織
Microstructure in cast stainless steel used for long-term in BWR environment
著者:
澤部 孝史 Takashi SAWABE 土肥 謙次 Kenji DOHI 野本 明義 Akiyoshi NOMOTO 新井 拓 Taku ARAI
発刊日:
公開日:
atom probe tomographycast stainless steelG-phasenanoindentation testingphase decompositionsolution treatmentthermal aging
概要
Microstructure in a cast stainless steel used for a PLR pump casing cover in a BWR was investigated by atom probe tomography and nanoindentation testing. Ferrite phase decomposition and G-phase precipitation were no t observed in the as-received PLRP casing cover. Thermal aging and solution treatment were carried out on the as-received PLRP casing cover and an unused model alloy of cast stainless steel. The ferrite phase decomp osition and G-phase precipitates in the thermal aged model alloy disappeared after the solution treatment, and the nanoindentation hardness in the ferrite phase was recovered. Changes in the microstructures were alm ost the same between the PLRP casing cover and the model alloy after the thermal aging and the solution treatment. The effect of thermal aging on the as-received material was considered to be very little in service.
