(东北大学 材料与冶金学院，沈阳 110004 )
摘 要:
关键字: 马氏体不锈钢；NiCrSiB；激光熔覆；空蚀
（School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China）
Abstract: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.
Key words: martensite stainless steel; NiCrSiB; laser cladding; cavitation erosion
