Abstract
It had been revealed that the fatigue life of the hot forging die for a connecting rod was improved by cavitation shotless peening (CSP). In the present paper, in order to improve peening intensity and reveal surface modification by CSP, Vickers hardness, surface roughness and residual stress changing with depth of the specimen made of tool alloy steel peened by CSP were measured. It was revealed that peening intensity was improved compared with SP and former type of CSP, and residual stress in sub-surface was changed with processing time of CSP.
