铸造碳化钨粉末物性对激光熔覆陶瓷颗粒增强Fe基复合材料耐磨性能的影响  

Effects of Cast Tungsten Carbide Powder on Wear Resistance of Laser Cladding Ceramic Particle Reinforced Iron Matrix Composite

作　　者：邹黎明[1] 刘辛[1] 王蕾[1] 谢焕文[1] 蔡一湘[1] 

机构地区：[1]广东省科学院广东省材料与加工研究所,广东广州510650

出　　处：《稀有金属材料与工程》2017年第4期1126-1131,共6页Rare Metal Materials and Engineering

基　　金：国家国际科技合作专项(2011DFR50740);广东省战略性新兴产业核心技术攻关专项(2011A091102007);广州市科技计划专项(2012J5100050);广东省科学院科研平台环境与能力建设专项资金专项(2016GDASPT-0209);广州市科创委创新平台建设与共享专项(201509010003)

摘　　要：为研究铸造碳化钨粉末物性对激光熔覆陶瓷颗粒增强Fe基复合材料耐磨性能的影响,将不同制备方法和粒径的铸造碳化钨粉末添加到Fe基合金粉中,在45号钢表面进行激光熔覆以获得高硬度和高耐磨的合金化层。利用金相显微镜、扫描电子显微镜(SEM)、X射线衍射仪(XRD)、硬度计分别分析了合金化层的显微组织、物相组成以及显微硬度。利用轮式磨损试验机测试了其常温下的耐磨性能,并进行了比较。结果表明:熔覆层主要由莱氏体组成,碳化钨粉末的制备方法和粒径差异对复合材料的耐磨性能具有重要影响。等离子旋转电极雾化法制备的碳化钨粉末能起到最好的增强耐磨作用,粒径细的碳化钨粉末比粒径粗的粉末增强耐磨效果要好。Tungsten carbide powders with different particle sizes were prepared by different methods, and then they were added into Fe alloy powders. The laser cladding technique was used to form an alloyed layer with high hardness and wear resistance on 45# steel with such mixed powders to study the effects of cast tungsten carbide powders on wear resistance of ceramic particle reinforced Fe matrix composites. The microstructure, phase composition and microhardness of the cladding layer were investigated by OM, SEM, XRD and hardness tester. Their wear resistance was tested by a wheel wear test machine. Results show that the cladding layer is mainly composed of ledeburite phase. The differences of tungsten carbide powders in preparation and grain size exert important effects on wear resistance of the cladding layer. The tungsten carbide powder prepared by plasma rotating electrode process plays a better role in increasing wear resistance while the fine tungsten carbide powder is superior to the coarse powder in it.

关 键 词：铸造碳化钨粉末 激光熔覆 磨损 显微硬度 

分 类 号：TG174.4[金属学及工艺—金属表面处理]