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材料加工与表面工艺Surface Strengthening

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Shot Peening and Laser Shock Peening

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Case Reference

Numerical simulation and high cycle fatigue behaviour study on shot peening of MAR-M247 nickel-based alloy

The effects of shot peening on the surface microstructure, tensile properties, and high-cycle fatigue properties of MAR-M247 nickel-based superalloy were investigated. The predicted surface roughness, magnitude of residual stress, and depth of plastic strain in the surface layer were simulated by the numerical simulations coupled Finite Element Method-Discrete Element Method (FEM-DEM). The results show that the shot peening treatment induced significant plastic deformation in the surface layer, leading to the accumulation of a large number of dislocations in the γ matrix, forming dislocation walls, resulting in the formation of fine grains. A high density of dislocations, work hardening, and residual compressive stresses occur after the shot peening treatment. These beneficial changes enhanced the resistance to crack initiation and propagation, thereby inhibiting surface crack initiation, and increasing the fatigue life and tensile strength of the alloy.

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