1Cr12Ni2W1Mo1V不锈钢表面等离子堆焊司太立熔覆层的组织及性能

为提高1Cr12Ni2W1Mo1V不锈钢的耐水蚀性能,采用等离子堆焊方法在其表面制备司太立熔覆层。研究了涂层的显微组织和显微硬度分布,分析了涂层的抗微粒冲蚀性能和耐水蚀性能。结果表明:司太立熔覆层与基体材料冶金结合良好,熔覆层组织细小、分布均匀,基体为枝晶状Co-Cr固溶体,枝晶间较均匀地分布着黑色碳化物,主要为M7C3和少量WC颗粒;司太立熔覆层的平均显微硬度(382.38 HV4.9 N)约为基材平均硬度(195.29HV4.9 N)的1.96倍,最高硬度值达到了421.00 HV4.9 N;堆焊第2层的硬度明显高于第1层的;司太立熔覆层合金的抗微粒冲蚀性能优于基材,其水蚀速度比基材小,在基材1Cr12Ni2W1Mo1V上堆焊司太立合金能有效提高其耐水蚀性能。

Microstructure and Performance of Stellite Cladding Layer on 1Cr12Ni2W1Mo1V Stainless Steel by Plasma Surfacing

In order to improve the water erosion resistance property of 1Cr12Ni2W1Mo1V stainless steel,Stellite cladding layer was prepared on the surface of 1Cr12Ni2W1Mo1V stainless steel by plasma surfacing. Microstructure and hardness distribution of the cladding layer were studied,and the anti-particle erosion resistance and water erosion resistance of the cladding layer were analyzed. Results showed that the metallurgical bonding between Stellite cladding layer and base material was good,and the microstructure of the surfacing layer was fine and even.The dendrite matrix was Co-Cr solid solution,and the black carbides distributed evenly among the dendrites,which was mainly M7 C3 and a small amount of WC particles. The average microhardness( 382.38 HV4.9 N) of the Stellite cladding layer was about 1.96 times of that of the substrate( 195.29 HV4.9 N),and the highest hardness value reached 421.00 HV4.9 N. The hardness of the second layer was obviously higher than that of the first layer. The corrosion resistance of Stellite cladding layer was better than that of the base material,and its water erosion rate was slower than that of the substrate. The water corrosion resistance of the alloy could be effectively improved by surfacing the Stellite alloy on the substrate.