自制了不同含量及粒径的WC高锰钢焊条, 采用火焰堆焊获得了高锰钢堆焊层, 运用金相分析、X射线衍射分析、磨损试验等方法研究了WC颗粒含量和粒径对堆焊层组织及耐磨性能的影响。结果表明: 堆焊层中WC颗粒与基体界面结合良好, 组织为奥氏体枝晶和莱氏体共晶碳化物; 随着WC含量的增加, 组织由奥氏体等轴晶转变为枝晶, 枝晶间合金碳化物及共晶组织随之增多; 小粒径颗粒对堆焊层组织的影响略于大粒径颗粒的; WC颗粒显著提高了高锰钢堆焊层的耐磨性能。

A series of high manganese steel electrodes with different WC contents and particles were self-prepared and high manganese steel surfacing layer was obtained by flame surfacing, and the effects of the WC contents and size on microstructure and wear resistance of surfacing layer were studied by optical microstructure analysis, X-ray diffraction analysis and wear resistance testing. The results show that the WC particles were well combined to the substrate and the microstructure was austenitic dendrite and ledeburite eutectic carbide. The microstructure changed from austenite isometric crystal to dendritic crystal, and the interdendritic alloy carbide and eutectic microstructure increased with the increase of WC content. Comparing with big size WC particle, the effect of small size WC particle had bigger effect on the microstructure of surfacing layer. The WC particles dramatically enhanced the wear resistance of high manganese steel surfacing layer.