ABSTRACT

FeCoCrNiMnAl high-entropy alloy cladding was fabricated on the surface of 4Cr5MoSiV1 substrate by laser cladding technology. The microstructure, hardness and wear resistance of the cladding layer were systematically investigated using electron back scattered diffraction, transmission electron microscope, microhardness and wear tests. The was no obvious change in the grain size, type and proportion of phases (dual-phases of face centred cubic and body centred cubic ) in the FeCoCrNiMnAl coating after heat treatment at 600°C for 100 h. The recrystallization induced by the heat treatment decreased the density of dislocations. Finally, the microhardness and wear resistance of the FeCoCrNiMnAl cladding layer decreased by 9.2% and 11.7%, respectively, after the heat treatment. Nevertheless, it still fulfils the application requirements.

摘要

采用激光熔覆技术在4Cr5MoSiV1基体表面制备FeCoCrNiMnAl高熵合金熔覆层。采用电子背散射衍射、透射电子显微镜、显微硬度和磨损试验系统研究了熔覆层的显微组织、硬度和耐磨性。FeCoCrNiMnAl涂层在600°C热处理100 h后，其晶粒尺寸、相的类型和比例（面心立方和体心立方双相）没有明显变化。热处理引起的再结晶降低了位错密度。最后，热处理后FeCoCrNiMnAl熔覆层的显微硬度和耐磨性分别下降了9.2%和11.7%。尽管如此，它仍然满足应用要求。