Abstract
High-energy shot peening (HESP) can introduce not only compressive residual stresses but also nanocrystalline layer close to the surface. Surface nanocrystallization leads to great improvement of surface hardness and fatigue property of treated metallic components. In this paper, a finite element method (FEM) was proposed to investigate the effects of HESP parameters, including surface coverage, shot diameter and shot velocity, on the grain refinement phenomenon. The quantitative relationship between the grain size and the equivalent plastic strain (PEEQ) was obtained by comparing the data from FEM simulation and x-ray diffraction in experiments. The surface topography and the depth profiles of microhardness and full width at half maximum were analyzed with the aim of assessing and verifying the surface integrity and nanostructure formation after HESP treatment. The results showed that appropriate increment of surface coverage, shot diameter and shot velocity was beneficial to grain refinement and nanostructure formation on a treated surface after HESP treatment. Through reasonable process control of HESP, microcracks did not appear on a treated surface even when the shot peening surface coverage reached up to 1000%.
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