Abstract
Abstract Water-jet cavitation peening (WCP) is used to increase the hardness and induce the formation of a compressive residual stress layer on the surface through the shock wave pressure, which is produced by the collapse of small bubbles of a cavitation jet at the surface of materials. In this article, a pressure sensitive paper is applied to determine the pressure field distribution of WCP. WCP is carried out on the bearing steel 100Cr6 with different microstructures, which are heat-treated differently. The hardness, residual stress distribution, and microstructure of bearing steels at the same observation points are compared, respectively, before and after WCP. The research indicates that both the hardness and residual stress are increased with the peening time. It also proves that this method has different strengthening limits for materials with different microstructures because of the different mechanisms of WCP.
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