Abstract:
The orthogonal experimental design method was used to optimize the laser cladding process of 2Cr13 stainless steel surface Stellite6 alloy coating. The Stellite6-NbC and Stellite6-WC alloy composite coatings were prepared by the optimized process. The addition amount (mass fraction) of NbC and WC was 1%, 3%, 5%, 7%,10%, respectively. The microstructure, microhardness and corrosion resistance of the composite coatings were studied. The results show that the optimal process parameters of laser cladding of Stellite6 alloy coating were laser power of 1 600 W, powder feeding capacity of 40 g · min
−1, scanning speed of 17 mm · s
−1. The microstructure of the two alloy composite coatings prepared by the best process was uniform and dense, and the coating formed a good metallurgical bond with the substrate. The microstructure of the Stellite6-NbC alloy composite coating was more uniform and fine. With the increase of the amount of NbC and WC, the average microhardness of the two alloy composite coatings increased, which was higher than the matrix and pure Stellite6 alloy coating, and the corrosion rate decreased, which was lower than the substrate and pure Stellite6 alloy coating. The average microhardness and corrosion rate of Stellite6-NbC alloy composite coating were higher than those of Stellite6-WC composite coating with the same additive amount, and the average microhardness was 10‒40 HV higher.