Abstract
Laser shock imprinting (LSI) is used to fabricate imprinted morphology on the surface of 316 stainless steel. The profile and the height variation of imprinted morphology on the sample surface treated by multiple LSI impacts were investigated by experiment and finite element modeling (FEM) simulation. The results showed that after initial LSI impact, micro bulges were imprinted on the sample surface accompanied with the generation of gradient deformation, work hardening effect and compressive residual stress. When the subsequent LSI impacts were performed, the sample surface deformed with a lower rate because of the existence of work hardening effect and compressive residual stress. The height of bulges decreased, which was due to the effect of the gradient deformation induced by laser shock wave to imprinted zone.
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