界面合金化制备WC_P颗粒增强钢基复合材料

采用真空实型负压铸渗工艺,通过在预制复合层中添加适量钼铁粉进行界面合金化,成功制备出了WCP颗粒增强钢基表面复合材料。结合OM、SEM、XRD和显微硬度计等分析手段对复合层物相组成、显微结构与性能进行了测试。结果表明,添加16.67%(质量分数)的钼铁粉有效改善了复合层界面组织及力学性能的连续性,改善了复合材料的铸渗效果,增加了铸渗层厚度,合金碳化物含量增加,复合层基体硬度约是基材的2倍,提高了复合材料的耐磨性。

Fabrication of WCP/Steel Composites with Interface Micro-Alloying Ferro-Molybdenum Powder

WC particles reinforced steel matrix surface composites were fabricated successfully through adding proper ferro-molybdenum powder in the preformed composite layer to control interface by the vacuum full-mold infiltration casting process under negative pressure.The phase compositions,microstructure and hardness of the composite layer were characterized by optical microscope(OM),scanning electron microscopy(SEM),X-ray diffraction(XRD)and micro-hardness tester.The results show that,the interface structure and mechanical properties as well as the cast-infiltration effects of the composite layer are improved significantly by adding 16.67 % ferro-molybdenum powder in the preform.Meanwhile,cast-infiltration layer thickness is increased.With the volume fraction of alloy carbide increase,the composites layer hardness is nearly 2 times higher than that of the matrix,greatly enhancing the wear resistance of the WCP/steel composites.