Effect of shot peening strengthening on microstructure and properties of 7A52 aluminum alloy

Aluminum alloy is tend to occur hydrogen-induced brittle fracture and has significant security risks in the service process when it under residual tensile stress.The effects of different shot peening processes on the organizational structure and roughness of the aluminum alloy are analyzed.Qualitative and quantitative analysis of aluminum alloy under different shot peening processes are made and the effect of pelleting size on grain refinement and roughness are researched.The results show that the surface grains of 7A52aluminum alloy are obviously refined.The more dense strengthening layer can be formed on the aluminum alloy surface,approximately 300μm.The strengthening layer doesn't have obvious cracks,the effect of shot peening is better.The effect of pills grain size on the surface of grain is little,the effect on the material surface is significant.With the pills grain size increase,the roughness of surface also increases.