PREPARATION FEMTOSECOND LASER PREVENTION FOR THE COLD- WORKED STRESS CORROSION CRACKINGS ON REACTOR GRADE LOW CARBON STAINLESS STEEL*

Femto-second (fs) lasers like low average power, Ti:Sapphire lasers, the JAERI high average power freeelectron laser excimer laser, fiber laser and so on could peel off and remove two stress corrosion cracking ( SCC ) origins of the cold-worked (CW) and the cracking susceptible material, and residual tensile stress in hardened and stretched surface of low-carbon stainless steel cubic samples for nuclear reactor internals as a proof of principle experiment except for the third origin of corrosive environment. Because it has been successfully demonstrated that the fs lasers could clearly remove the two SCC origins, we could resultantly prevent the coldworked SCC in many fields near future.