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 casting tungsten carbide powder on the wear resistance of laser cladding ceramic particle reinforced iron matrix composite

摘要:

为了比较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,本研究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。

Abstract:

The aim of the research is to study the effects of casting tungsten carbide powder on wear resistance of ceramic particle reinforced Fe matrix composites by laser cladding. The tungsten carbide powders with different particle size preapred by different methods were added into Fe alloy powders. The laser cladding technique was used to form alloyed layer with high hardness and wear resistance on 45# steel with such mixed powders. The microscope, SEM, XRD and hardness tester were used to investigate microstructure, phase composition and microhardness of cladding layer. The wheel wear test machine was used to test their wear resistance. The result shows the cladding layer is mainly composed of ledeburite phase. The difference of tungsten carbide powder makes important effects on wear resistance. The tungsten carbide powder prapared by plasma rotating electrode process can increase wear resistance mostly. The increasing effect of fine tungsten carbide powder on wear resistance is more remarkable than the coarse powder.