氩弧熔覆TiC颗粒增强Fe基涂层组织性能研究

Study on Microstructure and Properties of TiC-Fe45-based Composite Coating by Argon Tungsten-arc Cladding

目的研究氩弧熔覆条件下TiC颗粒增强Fe基涂层的组织和性能。方法在Fe45自熔性合金粉末中添加TiC颗粒,利用氩弧熔覆技术在Q235钢基材表面制备出含TiC颗粒增强的Fe基合金复合涂层,并对熔覆层的显微组织结构、硬度分布及耐磨性能进行分析研究。结果复合涂层是由(Fe,Ni)形成的枝晶和枝晶间的(Fe,Cr)23(C,B)6,Fe3(C,B)共晶组织以及TiC增强颗粒组成,TiC颗粒细小弥散分布在基体金属内,部分TiC颗粒聚集生长为棒状、十字状和放射状。结论熔覆层的显微硬度最高可达980HV,较Q235钢提高了4倍,耐磨性提高了约11倍。

Objective To study the microstructure and properties of TiC-Fe45-based composite coating by argon tungsten-arc cladding. Methods Through addition of Tic particles into the Fe45 self-fluxing alloy powder, the composite coating of Fe-based al- loy reinforced by TiC particles was prepared by argon tungsten-arc cladding process. The microstructure, microhardness distribution and wear resistance of the coating were analyzed. Results The composite coating was composed of the dendritic （ Fe, Ni） -based ma- trix, interdendritic （ Fe, Cr） 23 （ C, B） 6, Fe3 （ C, B） eutectic structure and TiC reinforcement particles. The TiC particles were dis- persedly embedded into the matrix, and part of the particles were congregated into virgate, cross and radial shapes. Conclusion The microhardness of the composite coating could reach 980 HV, which was more than four times that of the substrate and the wear resistance was increased by nearly 11 times.