钴基碳化钨增强等离子弧堆焊覆层的制备及其磨损行为

Preparation and Wear Behavior of WC-Co Reinforced Plasma Arc Surfacing Coating

采用粉末等离子弧堆焊的方法,对热锻模钢H13钢基体表面进行不同含量的钴基合金粉末+碳化钨粉末的堆焊。利用金相显微镜和扫描电镜观察堆焊层的组织和形貌,并通过EDS分析堆焊层的化学成分;对其不同碳化钨含量的钴基堆焊层进行显微硬度与磨损性能的测试,探究碳化钨含量对堆焊层性能的影响。结果表明:碳化钨增强钴基堆焊层与基体冶金结合良好,堆焊层较H13钢基体的硬度有较大提高;当碳化钨含量为30%时,其耐磨性较基体提高了10倍。

Different content of cobalt-based alloy powder and WC powder were surfaced on H13 steel by using powder plasma arc surfacing.The microstructure and morphology of the surfacing layer were observed by metallographic microscope and scanning electron microscope,and the chemical composition of the surfacing layer were analyzed by EDS.The microhardness and wear performance of the surfacing layer with different levels of WC content were tested.The effects of WC content on the surfacing layer performance was explored.The results show that the metallurgical bonding between WC reinforced cobalt-based composite coatings and substrate is good,and the hardness of the surfacing layer is higher than that of H13 steel substrate;when the content of WC is 30%,the wear resistance of the surfacing layer is 10 times higher than that of the substrate.