SHOT-PEENING STRENGTHENED LAYER AND ITS EFFECT ON FATIGUE STRENGTH OF α-BRASS

In shot peened α-brass surface layer{111} type planar defects and deformation microtwinshave been observed by means of TEM analysis.The density of microtwins deereases with theincrease of layer depth.The enhancement of fatigue strength and the unrelaxation of residualstress after shot peening are concerned in the substructures of strengthened layer.