Effect of cold working on the corrosion resistance of JPCA stainless steel in flowing PB-Bi at 450C

Rivai, A. K.*; Saito, Shigeru   ; Tezuka, Masao*; Kato, Chiaki   ; Kikuchi, Kenji*

In the present study, we applied 20% cold work (CW) treatment to JPCA austenitic stainless steel and investigated it from the corrosion behavior viewpoint. The corrosion test of 20% CW JPCA has been carried in the JLBL-1 (JAEA Lead-Bismuth Loop-1) apparatus. The maximum temperature and the exposure time of LBE were 450C and 1000 h, respectively. The results showed a different corrosion behavior between the JPCA without and with CW. As for the JPCA without CW, LBE penetrated into the matrix through a ferrite layer which was formed because of constituent metals dissolution from the matrix into LBE. As for the 20% CW JPCA, dissolution attack occurred only partially and formed localized superficial pitting corrosion. It was found that the different corrosion behavior occurred because the CW induced a structure transformation from -austenite to '-martensite and affected the corrosion resistance of the JPCA in flowing LBE at 450C.