不同参数下激光重熔Cr3C2－NiCr涂层冲蚀磨损性能研究
Study on Erosion Properties of Cr3C2-NiCr Coating Remelting with Different Laser Parameters
陈清宇, 富 伟, 纪岗昌
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作者单位：(九江学院 机械与材料工程学院, 江西 九江 332005)
中文关键字：激光重熔； Cr3C2-NiCr涂层； 冲蚀磨损
英文关键字：laser remelting; Cr3C2-NiCr coating; erosion
中文摘要：采用超音速火焰喷涂技术在低碳钢表面喷涂Cr3C2-NiCr涂层，然后在不同工艺参数下对其进行激光重熔处理， 考察不同重熔参数下涂层的冲蚀性能， 并与喷涂层对比。 结果表明： 在激光功率3.0 kW，扫描速率50 mm/s的工艺参数下激光重熔，涂层的冲蚀失重最小， 所形成的涂层表面均匀性较好；重熔层的致密度要优于喷涂层，重熔后涂层由机械结合转变为冶金结合；由于表面氧化层的存在和内部冶金结合的形成， 重熔层硬度较喷涂层高。
英文摘要：Cr3C2-NiCr coatings were sprayed on low carbon steel using high velocity oxy-fuel spraying, and then remelted by laser at different parameters. The erosion properties of spraying coatings and remelting coatings were inspected. The results show that the mass loss of coatings remelting at the power of 3.0 kW and the scanning velocity of 50 mm/s are the least. It is concluded that the surface is uniform at aforementioned parameters. The density of remelting coating is better than that of spraying coating because of metallurgical bonding. Microhardness of the remelting coating is higher than that of spraying coating because of oxide layer and metallurgical bonding.