Surface Layer Characteristics of S30432 Austenite Stainless Steel after Shot Peening

Three types of shot peening treatments were applied to S30432 stainless steel. The effect of shot peening intensity and shot peening method on the residual stress and microstructure has been investigated. The domain size and micro-strain evolutions in near surface layer were characterized systematically via Voigt method. The results reveal that shot peening could induce compressive residual stress in the deformed layer for all shot peening conditions. As the shot peening step and intensity increase, the compressive residual stresses increase in near surface layer, and decease faster in deeper deformed layer. In the deformed layer, the domain size increases, while the micro-strain decreases with the depth increasing. Comparing with the micro-hardness after shot peening, it is concluded that increasing the shot peening step is a considerable way to improve the shot peening effect.