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利用脉冲激光对含Ni不锈钢防护涂层进行离散划痕,通过X350A残余应力测试仪对激光离散划痕区残余应力进行测试,研究离散划痕后涂层表面残余应力状况,并分析激光冲击应力波对涂层结合强度的影响。结果显示,在激光加载的中心区域内涂层产生均匀的残余压应力,但该区域的边缘残余压应力急剧减小,甚至出现了残余拉应力;研究还表明,在激光加载区域涂层的残余压应力值随着激光功率密度的增加而增加,但当激光功率密度接近阈值时,涂层的残余压应力因脱黏鼓包开始减小,当激光功率密度足够大时,含Ni不锈钢涂层在拉应力作用下于激光加载光斑边缘发生断裂剥离。
The stainless steel protective coating containing Ni was discretized and scratched by pulsed laser. The residual stress of the laser scratches was tested by X350A residual stress tester. The residual stress on the surface of the coating was studied. The laser shock stress wave Effect on coating bond strength. The results show that the coating has a uniform residual compressive stress in the central region of the laser loading, but the residual compressive stress at the edge of the laser decreases sharply, and even residual tensile stress appears. The research also shows that the residual coating in the laser-loaded region The compressive stress value increases with the laser power density, but when the laser power density approaches the threshold value, the residual compressive stress of the coating begins to decrease due to the debonding bulge. When the laser power density is large enough, Under the action of tensile stress, the edge of the laser-loaded spot is fractured and peeled off.