应用激光, 2019, 39 (2): 204, 网络出版: 2019-06-10   

球阀表面激光熔覆钴基合金强化层耐磨性的研究

Wear Resistance of Laser Cladding Cobalt-based Alloy Strengthening Layer on Ball Valve Surface
作者单位
1 温州商学院创业学院,浙江 温州 325037
2 上海工程技术大学材料工程学院,上海 210023
摘要
应用5 kW光纤激光器在试验球阀基材表面熔覆了经过造粒的纳米碳化钨和包含ZrO2、SiO2的钴基合金粉末,观察分析熔覆层的显微组织,测试强化层的显微硬度和摩擦性能。试验结果表明,50%质量分数钴、40%质量分数纳米碳化钨和10%质量分数金属氧化物试样的显微组织均匀、致密,无裂纹与气孔。激光熔覆强化层平均厚度为1.4 mm,强化层与基材之间呈现冶金结合。强化层中存在网络状和点状分布的强化相,网络状强化相主要为WC,网络间弥散分布点状强化相主要为金属氧化物ZrO2、SiO2。强化层表层平均显微硬度在65 HV,较基体材料提高110%以上。在20 ℃和300 ℃环境下,试样磨损量较基材下降75.3%和68.2%。其中,网络状分布的WC强化相提升了涂层的硬度,网络间弥散分布的金属氧化物强化相加强了合金粉末的润湿性,减少了气孔和夹杂的产生,强化层的主要磨损机制为少量粘着磨损,强化层有利于提升球阀的耐磨性和实际工况中的使用寿命。
Abstract
The nano tungsten carbide and cobalt-based alloy powder containing ZrO2 and SiO2 were coated on the surface of the test ball valve substrate by using a 5 kW fiber laser. The microstructure of the cladding layer was observed and analyzed, and the microhardness and friction performance of the strengthened layer was tested. The test results show that the microstructure of 50% mass fraction cobalt, 40% mass fraction nano tungsten carbide and 10% mass fraction metal oxide sample is uniform and compact without cracks and pores. The average thickness of the laser cladding strengthening layer is 1.4 mm, and a metallurgical bond is formed between the reinforcing layer and the substrate. There are network-like and point-like distribution strengthening phases in the strengthening layer. The network-like strengthening phase is mainly WC, and the point-like distribution strengthening phase between the networks is mainly metal oxides ZrO2 and SiO2. The average microhardness of the surface layer of the strengthening layer is 65 HV, which is more than 110% higher than that of the matrix material. At 20 ℃ and 300 ℃, the sample wear amount decreased by 75.3% and 68.2% compared with the substrate. Among them, the network-like WC strengthening phase enhances the hardness of the coating. The metal oxide strengthening phase dispersed between the networks enhances the wettability of the alloy powder and reduces the generation of pores and inclusions. The main wear mechanism of the strengthening layer is a small amount of adhesive wear, and the strengthening layer is beneficial to improve the wear resistance of the ball valve and the service life in actual working conditions.

姜鹤明, 张光钧. 球阀表面激光熔覆钴基合金强化层耐磨性的研究[J]. 应用激光, 2019, 39(2): 204. Jiang Heming, Zhang Guangjun. Wear Resistance of Laser Cladding Cobalt-based Alloy Strengthening Layer on Ball Valve Surface[J]. APPLIED LASER, 2019, 39(2): 204.

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