H13 steel is frequently subjected to the high-strength alternating stress and cyclic thermal load impact, the Ni25 coating was prepared by laser cladding (LC) on the worn surface of H13 tool steel to repair the damaged components. As the residual stress induced by LC in the Ni25 coating, laser shock peening (LSP) was combined to further improve the stress distribution and strengthen the mechanical performance. The influences of LSP treatment on the microstructure and mechanical performance were systematically studied. Results showed that after LSP treatment, columnar dendrites in the surface layer with a depth of 0.28 mm were transformed into refined equiaxed dendrites. Meanwhile, the residual stress was completely converted from tensile state into compressive state, and the micro-hardness was also enhanced by 27.3 %, with the peak of 550 HV. Consequently, the coefficient of friction (COF) and wear rate of Ni25 coating were decreased significantly. Finally, extra attentions were paid to the laser shock wave-induced formation mechanism improvement in wear property of laser cladding Ni25 coating on H13 tool steel.

H13钢经常受到高强度交变应力和循环热负荷的影响，Ni25涂层是通过激光熔覆（LC）在H13工具钢的磨损表面上制备的，以修复损坏的部件。由于LC在Ni25涂层中由LC引起的残余应力，所以结合了激光冲击喷丸（LSP）可以进一步改善应力分布并增强机械性能。系统地研究了LSP处理对组织和力学性能的影响。结果表明，经过LSP处理后，表层深度为0.28 mm的柱状枝晶转变为精制的等轴枝晶。同时，残余应力从拉伸状态完全转变为压缩状态，显微硬度也提高了27.3％，峰值为550 HV。因此，Ni25涂层的摩擦系数（COF）和磨损率显着降低。最后，对H13工具钢上的Ni25激光熔覆层的磨损性能的激光冲击波诱导形成机理的改善给予了更多的关注。