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采用激光感应复合快速熔覆(LIHRC)的方法,在A3钢表面制备了Fe基WC涂层,研究了涂层的显微组织与显微硬度特征。结果表明,WC颗粒在激光感应复合快速熔覆过程中完全溶解,并与粘结金属Fe基合金交互作用后,在树枝晶间析出M_6C型碳化物。WC颗粒的完全溶解与涂层内存在大量残余奥氏体,是Fe基WC涂层显微硬度偏低的主要原因。
The Fe-based WC coating was prepared on the surface of A3 steel by laser induced composite rapid cladding (LIHRC) method. The microstructure and microhardness of the coating were studied. The results show that the WC particles dissolve completely during rapid laser cladding process and interact with the binder metal Fe - based alloy to precipitate M_6C carbides between the dendrites. The complete dissolution of WC particles and the presence of a large amount of retained austenite in the coating are the main reasons for the low hardness of the Fe-based WC coating.