中文摘要：

应用激光熔覆法，采用镍基NiCrSiB合金粉末在CrNiMo不锈钢表面制作熔覆涂层。利用X射线衍射仪分析熔覆层的相组成；利用超声震荡空蚀实验机对熔覆层的空蚀行为进行研究；利用扫描电镜观察空蚀形貌。结果表明，所制得熔覆层组织均一、致密，与基体形成良好的冶金结合。抗空蚀能力提高到CrNiMo不锈钢基体的3倍。熔覆层抗空蚀能力增强的主要原因是熔覆层与基体良好的冶金结合、镍铬合金本身的良好性能和硼化物、硼碳化物等析出相的强化作用。

英文摘要：

The laser cladding layer of Ni-based alloy was made on the surface of CrNiMo stainless steel specimens using NiCrSiB powders. The phases of the cladding layer were investigated by using XRD; the cavitation erosion behavior of the cladding layer and CrNiMo stainless steel was investigated by ultrasonic vibration cavitation erosion equipment, and the surface morphologies after cavitation erosion was investigated by SEM. The results show that the laser cladding layer has dense microstructure, and metallurgically combines with CrNiMo substrate. The cavitation erosion-corrosion resistance of the laser cladding layer is 3 times of that of the CrNiMo stainless steel specimen. The improvement in corrosion resistance of the layer is due to the metallurgical combination, good corrosion resistance property of NiCrSiB alloy and strengthen effects of borides and boron-carbides precipitated phases.