Influence of High-frequency Micro-forging on Surface Residual Stress of 304 Stainless Steel Sample Fabricated by Laser Prototyping

摘要

Two groups of 304 stainless steel samples different in thickness were prepared by Laser Prototyping,one of which was treated by high-frequency micro-forging.The residual stress on the sample surface was measured by strip cutting method.The results showed that the surface residual stress of the samples was tensile stress,which increased with thickness,and the residual stress began to drop while the thickness of samples arrived at a certain value.Therefore high-frequency micro-forging could regulate the surface residual stress state of the samples.Specifically,micro-forging could transform the tensile stress into compressive stress,which rose with the increase in thickness of samples and tended to be stable afterwards.