铁基复合材料中碳化钨颗粒的溶解析出行为  

Dissolution and Precipitation Behavior of WC Particles in Iron Matrix Composites

作　　者：吴迎飞 陈华辉[1] 李海存 张婉婷[1] WU Ying-fei;CHEN Hua-hui;LI Hai-cun;ZHANG Wan-ting(School of Mechanical Electronic and Information Engineering,China University of Mining and Technology（Beijing）,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)机电与信息工程学院,北京100083

出　　处：《材料工程》2018年第8期98-105,共8页Journal of Materials Engineering

基　　金：国家自然科学基金项目(51571210)

摘　　要：以Fe30A自熔合金为基体,铸造碳化钨和钴包碳化钨为增强颗粒,采用粉末冶金方法制备大颗粒、小颗粒及混合颗粒级配增强铁基复合材料,并对其组织和相结构进行分析。结果表明:铸造碳化钨颗粒的溶解从边缘开始,与基体发生反应生成絮状的过渡层Fe6W6C以及分散的小颗粒状Ni_(17)W_3,钴包碳化钨部分颗粒完全转化为小颗粒状Ni_(17)W_3;混合颗粒增强的复合材料,其组织形貌为大颗粒间均匀分布小颗粒,小颗粒一部分来源于原始颗粒,另一部分为颗粒与基体反应而生成的Ni_(17)W_3。对3种颗粒增强复合材料进行硬度及磨损性能测试,结果表明,级配增强复合材料的硬度高、耐磨性更好。Different sizes and graded mixed WC particles reinforced iron matrix composites were prepared by powder metallurgy,in which Fe30 Aself-fluxing alloy was used as the matrix,and the cast WC and the WC-Co as the reinforcement.Microstructure and phase of the composites were analyzed.The results show that the cast WC particles are dissolved from the edge of the particles and react with the matrix to generate the flocculent Fe6W6 C interlayer and disperse Ni17W3 small particles,and part of the WC-Co particles are transformed into Ni17W3 particles.The microstructural morphology of the mixed particle reinforced composite materials presents that small particles are uniformly distributed between large particles,and the small particles can be the primary particles or the Ni17W3 particles.The hardness and wear properties tests of the composite materials show that the graded mixed reinforced composite has higher hardness and better wear resistance.

关 键 词：WC颗粒 溶解 金属基复合材料 颗粒级配 

分 类 号：TB331[一般工业技术—材料科学与工程]