Surface Characteristics of H13 Alloy Steel Remanufactured by Laser Cladding Repair and Laser Shock Peening

In the context of high-temperature working conditions, the surface of H13 alloy steel exhibits a propensity for high-temperature erosion and wear. The advent of laser cladding repair technology has led to significant advancements in the field of surface restoration. Nevertheless, laser cladding repair may result in microcracks on the repaired surface. To solve this problem, an innovative approach to enhancing the surface integrity of molds through the application of laser shock peening was explored. This method aims to address surface imperfections by introducing residual compressive stress. The microhardness increased from 443 HV1.5 to 605 HV1.5. Residual compressive stress of −158 MPa was introduced. The surface corrosion resistance and wear performance were enhanced after laser shock peening. The corrosion current density was reduced, and the polarization resistance was increased.