Effects of Shot Peening Processes on Residual Stress Distribution and Retained Austenite Content in Shot-peened Layer of 17CrNi2Mo Steel

The surface strengthening treatment of 17CrNi2Mo steel was conducted using different shot peening (SP) processes,and the effects of SP on the residual stress distribution and the content of retained austenite in shot-peened layer were studied.The result show that SP produced the compressive residual stress (CRS) on the surface of 17CrNi2Mo steel,and CRS increased first,then decreased with the increase of depth.Increasing SP intensities,surface CRS,maximum CRS and influencing depth all increased.Moreover,the increases of SP numbers were beneficial to the improvement of surface CRS and maximum CRS.The retained austenite content decreased after SP,the higher SP intensities and numbers,the smaller austenite contents.Austenite contents decreased with the increase of depth.