利用铸渗结合热处理工艺, 在HT300灰铸铁表面原位制备了碳化钨(WC)层, 利用扫描电子显微镜、X射线衍射仪和销盘磨料磨损试验机研究了WC层的显微组织和耐磨性能, 分析了其磨损机理。结果表明：灰铸铁表面形成了厚度约为112 μm的WC层; WC层的相对耐磨性随载荷的增大先增加后减小, 载荷为15 N时, WC层的耐磨性明显高于灰铸铁的; 大载荷下WC层的磨损失效形式主要表现为颗粒挤压破碎并有部分剥落, 同时, 有片状的磨屑产生。

Tungsten carbide (WC) layer was in-situ synthesized at the surface of HT300 gray cast iron by combination of casting-infiltration and heat treatment process. The microstructures and wear resistance of the WC layers were studied by scanning electron microscopy, X-ray diffraction and pin disk abrasive wear test. The wear mechanism was also analyzed. The results show that the WC layer with thickness of 112 μm was formed on the surface of the gray cast iron. The relative wear resistance of the WC layer first increased then decreased with the increase of loads. When the load was 15 N, the relative wear resistance of the WC layer was better than that of the gray cast iron. Under the heavy load, the wear-out failure of the WC layer mainly ascribed to particles′ squeezing fracture and partial peeling, meanwhile sheet-like wear debris was generated.