Abstract: Stellite6 alloy coating was prepared on the surface of 316L stainless steel by laser cladding with coaxial feeding powder, which aims to improve the Pb-Bi erosion resistance property of the 316L stainless steel. The Stellite6 alloy coating was placed in liquid Pb-Bi at 400 ℃ high speed flow corrosion test for 500 h, The relative flow rate was set at 2.56 m/s. The coating microstructure, phase composition, element distribution, hardness distribution and the Pb-Bi erosion resistance property were studied, the results show that the microstructure of the coating is composed of equiaxed, dendritic, cellular and planar crystals, and the grains in the overlap zone grow in different directions. The coating mainly includes γ-Co, CoCx, (Cr,Fe)7C3 and M23C6 phases, each component element distributed on the coating surface evenly, Co, Cr and Fe elements diffuse between the 316L substrate and the coating layer obviously. The average hardness of the Stellite6 coating is 2.3 times that of the 316L substrate, and the highest hardness is 556.8HV. After the high-speed liquid Pb-Bi corrosion, large and continuous oxides are generated on the surface of 316L stainless steel, and there is a large number of micro-corrosion pits. The surface of Stellite6 coating is well maintained with a small amount of oxides existed and no obvious corrosion pits founded. Stellite6 coating surface roughness is 1.0 μm,while 316L surface roughness is 2.4 μm. Stellite6 alloy coating can effectively improve the corrosion resistance of 316L stainless steel matrix in high temperature liquid Pb-Bi alloy.
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2021, Vol. 35 
