应用激光, 2018, 38 (6): 934, 网络出版: 2019-01-27   

扫描速度对激光熔覆FeNiAl合金涂层的组织与性能影响

Effect of Scanning Speed on Microstructure and Properties of Laser Cladding FeNiAl Alloy Coating
作者单位
1 山东职业学院轨道交通应用技术研究所,山东 济南 230000
2 华东交通大学载运工具与装备教育部重点实验室,江西 南昌 330013
摘要
利用半导体激光器在45号钢表面制备了FeNiAl合金熔覆涂层,采用光学显微镜(OM)、X射线衍射仪(XRD)及能谱仪(EDS)对熔覆层的显微组织进行分析。利用显微硬度计和磨损试验机及多功能材料表面性能测试仪测试熔覆层的显微硬度和摩擦磨损性能。结果表明,FeNiAl合金熔覆涂层组织均匀致密,与基体形成良好冶金结合; 熔覆涂层物相为AlNi、Al0.9Ni1.1、γ-Fe以及α-Fe相。随着扫描速度的增加,熔覆层的显微硬度和耐磨性表现为先升高后降低。当扫描速度为270 mm/min时,可得到显微硬度较高、耐磨性较好的熔覆涂层,此时熔覆层显微硬度为471.3 HV0.2,是基体的2.35倍,磨损量(载荷300 N)为0.007 1 g,是基体材料的2.8倍。
Abstract
The FeNiAl alloy cladding coating was fabricated on a 45 steel substrate by a diode laser. The microstructure of the cladding coating was analyzed by optical microscope (OM), X-ray diffraction (XRD) and energy disperse spectroscopy (EDS). The microhardness, friction and wear properties of the cladding layer were tested by a microhardness tester, a wear tester and a multifunctional material surface property tester. The results show that the FeNiAl alloy cladding coating is uniform and compact, and forms a good metallurgical bond with the substrate. The main phases in cladding coating are AlNi, Al0.9Ni1.1, γ-Fe and α-Fe phase, with the increase of scanning speed, the microhardness and wear resistance of the cladding coating are increased first and then decreased. When the scanning speed is 270 mm/min, a cladding coating with high microhardness and better wear resistance can be obtained. At this time, the microhardness of the cladding coating is 471.3 HV0.2, which is 2.35 times of that of the substrate. The amount of wear (loading 300 N) is 0.007 1 g, which is 2.8 times of that of the substrate.

王震, 张坚, 臧胜超, 王绍军, 陈进. 扫描速度对激光熔覆FeNiAl合金涂层的组织与性能影响[J]. 应用激光, 2018, 38(6): 934. Wang Zhen, Zhang Jian, Zang Shengchao, Wang Shaojun, Chen Jin. Effect of Scanning Speed on Microstructure and Properties of Laser Cladding FeNiAl Alloy Coating[J]. APPLIED LASER, 2018, 38(6): 934.

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