Effects of conventional shot peening and surface mechanical attrition treatment on the mechanical properties of a Titanium alloy

摘要

Shot peening (SP) is one of the most popular surface plastic deformation process used in industry to improve mechanical properties of metallic parts. It consists in impacting the surface of pieces with shot. The multiple impacts induce superficial compressive residual stress in the material and enhance the surface characteristics and fracture resistance of the mechanical components. The surface mechanical attrition treatment (SMAT) technology has the quite same principle than SP but the main differences lie in the size, sphericity and velocity of the shot as well as the mean of projecting the shot onto the surface. In this paper the effects on the mechanical properties of conventional SP and SMAT are compared considering a titanium alloy. On the one hand, the intensities of these two mechanical treatments are compared. On the other hand, the roughness, micro hardness, microstructure and residual stress state induced by SP and SMAT are analysed and discussed taking into account titanium alloy plates.