Analysis of the formation of plastic deformation layer on the surface of polycrystalline metals subjected to a micro-size high-rate shot impact

Depth-profiling of residual stress and microstructure for austenitic stainless steel surface treated by cavitation, shot and laser peening

“…7 that the amplitude of GROD near the grain boundaries is significantly larger than that in the grains, especially for the CP and LP treatments. This tendency is similar to the result obtained by polycrystal plasticity finite-element analysis [49] which found that when the strain rate is increased, the plastic deformation near grain boundaries becomes significant. In the CP and LP specimens, the plastic deformation is caused by a shockwave having a strain rate larger than that of the SP and this difference may cause the differences in the microstructure and residual stress depth profiles.…”