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采用波长1.06μm、脉宽20 ns的钕玻璃激光对W18Cr4V高速钢进行强化。研究了激光功率密度对W18Cr4V钢强化层显微硬度和残余应力的影响。结果表明:经激光冲击强化后的W18Cr4V钢奥氏体晶粒细化,细晶强化作用显著;不同的激光功率密度都能在冲击区横截面上形成由表及里的显微硬度梯度和一定深度的残余压应力层。随功率密度的提高,硬度峰值和最大残余压应力增大,硬化层和残余压应力层的深度增加。当采用3.6 GW/cm~2的功率密度时,表面硬度峰高达1125 HV0.1,表面残余压应力最大值约-220 MPa,并可获得0.8 mm左右的硬化层和1.4 mm左右的残余压应力层。
The W18Cr4V high-speed steel was strengthened by neodymium glass laser with 1.06μm wavelength and 20 ns pulse width. The effect of laser power density on the microhardness and residual stress of W18Cr4V steel reinforcement was studied. The results show that the austenite grain refinement and grain refinement of W18Cr4V steel strengthened by laser shock are remarkable. Different laser power densities can form microhardness gradients in the cross section of the impact zone and a certain Depth of residual compressive stress layer. With the increase of the power density, the peak hardness and the maximum residual compressive stress increase, and the depth of the hardened layer and residual compressive stress layer increases. When the power density of 3.6 GW / cm ~ 2 is adopted, the surface hardness reaches as high as 1125 HV0.1 and the maximum compressive stress on the surface is about -220 MPa. The hardened layer with a thickness of about 0.8 mm and the residual compressive stress of about 1.4 mm can be obtained Floor.