Analytical evaluations of residual stress distributions generated by surface machining in austenitic stainless steel welded joints

Ihara, Ryohei*; Katsuyama, Jinya  ; Onizawa, Kunio ; Hashimoto, Tadafumi*; Mikami, Yoshiki*; Mochizuki, Masahito*

Stress corrosion cracking (SCC) has been observed near the weld zone of core shroud and recirculation pipes made of Type316L stainless steel. Residual stress distribution generated by welding and/or surface machining is very important for the evaluation of occurrence and propagation of SCC in such a non-sensitized material. In this work, residual stress distribution due to surface machining at the piping-weld has been evaluated by numerical simulations with the cutting speed varied. Analysis results showed that the thickness of hardened layer due to surface machining was limited only to a thin area of 0.2 mm, although higher cutting speed caused higher residual stress at the surface.