Investigation of microstructure and wear characteristics of laser-cladded CoCrFeNi-NbC composite coatings for automotive stainless steel applications
CoCrFeNi-NbC high entropy alloy composite coating was prepared on 304 stainless steel surface by laser cladding technology.The effect of NbC on the microstructure and wear resistance of CoCrFeNi high entro-py alloy coating was studied.The results show that the CoCrFeNi-NbC high entropy alloy composite coating has no cracks,pores and other defects,and the distribution of NbC in the coating is uniform.The composite coating is composed of FCC phase and NbC phase.The microhardness of the composite coating is(573±6.9)HV,about 1.8 times that of the CoCrFeNi coating.The composite coating is strengthened through solid solution mecha-nisms and the dispersion of secondary phases.The friction coefficient and wear rate of CoCrFeNi composite coating are better than those of CoCrFeNi coating.The average friction coefficient and wear rate of CoCrFeNi-NbC composite coating are 0.487 and 1.95×10-5 mm3/(N·m).The addition of NbC significantly improves the hardness and wear resistance of the CoCrFeNi coating.
NETL
NSTL
万方数据
