Plastic deformation behavior of 316 stainless steel subjected to multiple laser shock imprinting impacts

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.

Automated summary

Laser shock imprinting (LSI) is used to create imprinted morphology on the surface of 316 stainless steel. The study investigated the profile and height variation of the imprinted morphology after multiple LSI impacts through experiments and finite element modeling (FEM) simulation. The results showed that the initial impact resulted in micro bulges on the surface accompanied by gradient deformation, work hardening effect, and compressive residual stress. Subsequent impacts resulted in a lower deformation rate due to the work hardening effect and compressive residual stress, causing a decrease in bulge height.