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为提高调质态2Cr13低碳马氏体不锈钢汽轮机叶片的抗气蚀性能,采用连续CO_2横流激光器对其表面进行激光合金化处理,考察其显微组织、显微硬度和抗气蚀性能。结果表明,激光合金化处理后,显著地改变了2Cr13不锈钢表面的显微组织结构,表面平均硬度可达到701.2HV_(0.2)(基材表面显微硬度为200～250HV_(0.2)),横向残余应力为211.70MPa,纵向残余应力为334.60MPa。激光合金化后,抗气蚀性能比合金化前提高一倍以上。因此,激光合金化在提高抗气蚀性能和延长叶片使用寿命上具有较好的应用前景。
In order to improve the cavitation resistance of the tempered 2Cr13 low carbon martensitic stainless steel turbine blades, the surface of the 2Cr13 low carbon martensitic stainless steel turbine blade was laser alloyed by a continuous CO_2 cross-flow laser to investigate its microstructure, microhardness and cavitation erosion resistance. The results show that the microstructure of 2Cr13 stainless steel surface is changed obviously after laser alloying treatment, the average surface hardness can reach 701.2HV 0.2 (surface microhardness 200-250HV 0.2), and the horizontal residual The stress is 211.70 MPa and the longitudinal residual stress is 334.60 MPa. After laser alloying, the cavitation resistance is more than twice as that before alloying. Therefore, laser alloying in improving the anti-cavitation performance and prolong the service life of the blade has a good prospect.