Microstructure and wear resistance of FeCrCoNi coating on automotive stainless steel surface synthesized by laser in situ
In order to improve the surface hardness and wear resistance of 316 stainless steel for vehicle used,FeCrCoNi high entropy alloy coating were prepared on the surface of 316 stainless steel by laser cladding in situ synthesis.The phase composition,element distribution,microhardness and wear resistance of FeCrCoNi high entropy alloy coating were studied.The results show that the FeCrCoNi high entropy alloy coating prepared in si-tu has no cracks,pores and other defects,and has good metallurgical bonding with the substrate.FeCrCoNi high en-tropy alloy coating is composed of a single FCC phase with dendrite and interdendrite structures.All elements are evenly distributed without obvious segregation.The microhardness of FeCrCoNi high entropy alloy coating is 287.3 HV,which is about 50％higher than that of 316 stainless steel substrate.The average friction coefficients of FeCrCoNi high entropy alloy coating are 0.377 and 0.438,respectively,and the wear rate of FeCrCoNi high en-tropy alloy coating is 70％lower than the wear rate of 2.27×10-5 mm3/N.m and 6.17×1 0-5 mm3/N·m,respectively.The wear mechanism of FeCrCoNi high entropy alloy coating is abrasive wear.
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