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对1Cr11Ni2W2MoV马氏体不锈钢进行了激光冲击处理(LSP)的基础性研究。激光器最大输出能量为50J,激光功率密度3.7～7.5GW/cm2。吸收层和约束层分别选取Al箔和均匀流水层,激光束采用倾斜入射方式,实验对单光斑试样、搭接光斑试样、疲劳试样分别进行冲击。通过表面形貌、显微硬度和残余应力等检测,验证了激光功率密度对冲击区性能的影响。三组疲劳试件进行对比表明,先冲击后打孔试件的疲劳性能最好,其表面高幅值的残余压应力层能很好地抑制疲劳裂纹的萌生和延长裂纹扩展的速率。实验证明激光冲击处理可以有效提高马氏体不锈钢的疲劳性能。
The basic research on laser shock treatment (LSP) of 1Cr11Ni2W2MoV martensitic stainless steel was carried out. The maximum laser output energy of 50J, laser power density of 3.7 ~ 7.5GW / cm2. Absorbing layer and constraining layer were selected Al foil and uniform flow layer, the laser beam using oblique incidence method, the experiment of single spot samples, lap spot samples, respectively, the impact of fatigue specimens. The influence of laser power density on the performance of impact zone was verified by the test of surface morphology, microhardness and residual stress. The comparison of three groups of fatigue specimens shows that the first punched specimens have the best fatigue properties and the high compressive residual compressive stress layer can restrain the initiation of fatigue cracks and extend the rate of crack propagation. Experiments show that laser impact treatment can effectively improve the fatigue properties of martensitic stainless steel.