镍基WC等离子弧熔敷层的组织和高温磨损性能

Microstructure and high temperature abrasion resistance of Ni-based WC composite layer deposited by plasma arc

摘要: 为在15CrMo钢表面采用等离子堆焊含60%WC的镍基合金粉末,对堆焊层的显微组织、硬度和高温耐磨性能进行了试验分析.结果表明,堆焊层焊道成形良好,堆焊层组织致密.堆焊层横截面上WC颗粒分布均匀,WC颗粒的质量分数可达60%以上,堆焊后WC颗粒硬度值基本上仍保持了原有的高硬度,颗粒表面重熔量小.堆焊层具有较高的硬度;原始WC颗粒构成的硬质骨架,加上次生WC的弥散强化作用,使堆焊层具有良好的耐磨料磨损性能,其600℃高温耐磨料磨损性能为45正火钢的5倍以上。

Abstract: The Ni-based alloy powder with 60% WC was deposited on the surface of 15CrMo by plasma arc surfacing.The microstructures, hardness and wear resistance of the layer were analyzed.The results show that the layer has good external appearance and the WC particles which maintain its high hardness and exhibit few refusion distributes uniformly across the section of the layer.The layer also has high hardness and wear-resistance at elevated temperature, which is 5 times than that of 45 normalized steel.