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M6C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。

Fe-based WC composite coatings are prepared on the surface of A3 steel by laser induction hybrid rapid cladding (LIHRC). Microstructure and microhardness characteristics of the composite coatings are investigated. The results show that WC particles are almost dissolved completely and interact with Fe-based alloy,so that M6C are precipitated in the Fe-based interdendrite matrix phase. The reason why the microhardness of Fe-based WC composite coating is relatively low is that WC particles are dissolved completely and the retained austenite is precipitated during laser induction hybrid rapid cladding.