Simulation and experimental validation of residual stress and surface roughness of high manganese steel after shot peening

摘要

Shot peening(SP) is one of the most effective surface strengthening treatment technologies in which compressive residual stress(CRS) is induced beneath the specimen surface. In this study, residual stress distribution and surface roughness introduced by SP in the deformed surface layer of high manganese steel were investigated by means of three-dimensional (3D) finite element dynamic simulation and experimental validation. The effects of SP time, SP coverage rate and velocity of shot balls on the residual stress distribution and surface roughness were studied. The surface residual stresses of high manganese steel after SP were measured using X-ray diffraction (XRD) method. And the results of CRS simulation were consistent with the results of experiment, which verified the accuracy of the 3D finite element dynamic analysis. It is shown from simulation that both the peak value and the depth of compressive residual stresses increased with the increase of velocity of shot balls, and they gradually increase with the growth of SP time before they became stable, but the depth of the peak CRS was almost constant. Surface roughness also increased with the growth of SP time and velocity of shot balls.