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激光功率密度和搭接率对马氏体不锈钢的激光冲击区的表面轮廓有较大影响。激光功率密度从3.79 GW/cm2到7.25GW/cm2,冲击区塑性变形程度随功率密度增大而增大,当激光功率密度为6.09 GW/cm2时,冲击区塑性变形程度适中,其残余应力平均值达-569.1 MPa。搭接率试验结果表明,搭接率为33%时,可获得较大面积无挤出的激光冲击区,无挤出区域的塑性均匀,变形深度波动幅度在2μm以内,而且此搭接率下冲击区挤出面积较小,分布具有规律,便于再次冲击以降低冲击区的表面波纹度。
The laser power density and lap-over ratio have a significant effect on the surface profile of the laser impact zone of martensitic stainless steel. The laser power densities range from 3.79 GW / cm2 to 7.25 GW / cm2. The degree of plastic deformation in the impact zone increases with the increase of the power density. When the laser power density is 6.09 GW / cm2, the degree of plastic deformation in the impact zone is moderate, Value of -569.1 MPa. Laplace ratio test results show that when the lap-over rate is 33%, a larger area of the laser impact zone can be obtained without extrusion, and the plasticity of the non-extrusion zone is uniform and the depth of deformation is within 2 μm, and the lap-over ratio Impact area extrusion area smaller, with a regular distribution, easy to impact again to reduce the impact area of the surface waviness.