电冶熔铸WC/GCr15钢复合材料的摩擦磨损特性

Wear Behavior of WC/GCr15 Steel Composite Prepared by Electroslag Melting and Casting

选择大颗粒WC作增强相 ,采用电冶熔铸工艺制备了含 2 7%WC粒子的WC GCr15钢复合材料 ,观察了复合材料中WC颗粒与钢基体的结合情况 ;在MM 2 0 0型摩擦磨损试验机上研究了室温下复合材料同GCr15钢对摩时的摩擦磨损性能。结果表明 :复合材料中的WC颗粒部分溶解于钢基体相 ,两相界面形成厚达数微米的反应层 ,有效地提高了界面结合强度。电冶熔铸WC 钢复合材料的耐磨性能比基体材料GCr15钢提高了 5倍以上 ,扫描电镜下的磨痕照片显示 :大颗粒WC承担了磨损的主要载荷 ,实验中没有发生明显脱落的现象 ,说明界面结合强度在提高复合材料磨损性能方面所起的作用。

WC/GCrl5 steel (27%WCp) composite was produced by electroslag melting and casting using bigger WC particles as raw reinforcements. The interface of WC particle and steel matrix was examined. The wear tests of the composite against GCr15 steel were carried out on a MM-200 wear machine. The results show that the WC particles in the composites are partly melted into the steel matrix, and the reaction layer of several microns are formed at the interface between WCp and steel matrix, which enhances effectively the bonding strength of interface. The wear resistance of the composites is obviously increased to more that 5 times compared to that of GCr15 steel. The SEM images of worn surface show that the big WC particles bear the main load in the composite. No WC particles are peeled off, which indicates the role of interface bonding strength to improving wear behavior.