激光熔覆原位合成TiC-VC复合增强镍基涂层的研究  

Study of TiC-VC Compound Reinforced Ni-based Coatings Produced by Laser Cladding In-situ Synthesis

作　　者：丁阳喜[1] 陈元凯[1] 邵晓峰 丁洁 

机构地区：[1]华东交通大学轨道交通学院,江西南昌330013

出　　处：《热加工工艺》2017年第18期191-195,共5页Hot Working Technology

基　　金：江西省自然科学基金项目(20122BAB206007)

摘　　要：利用钛铁粉(FeTi70)、钒铁粉(FeV50)和石墨粉,采用5kW横流CO_2激光器在KmTBCr15Mo高铬铸铁表面原位合成制备TiC-VC复合颗粒增强的镍基熔覆层。利用扫描电镜、X射线衍射仪、显微硬度计及摩擦磨损试验机,研究了涂层的微观组织、相组成、硬度和磨损性能。结果表明:在激光作用下,通过钛铁粉、钒铁粉及石墨粉之间的反应,可得到TiC-VC颗粒。制备的熔覆层主要由(Fe,Ni)固溶体、TiC-VC复合碳化物组成。熔覆层与高铬铸铁基体形成良好的冶金结合。当粉末配比Ti∶V∶C(摩尔比)为0.4∶0.6∶1.2,激光功率为2.4kW,激光扫描速度为250mm/min为最佳组合,此时涂层硬度为824.5HV,相对耐磨性为2.32。Using 5 kW CO2 laser, TiC-VC compound particle reinforced Ni-based coating was in-situ synthesized on the surface of high chromium cast iron by KmTBCr15Mo using ferrotitanium, ferrovanadium and graphite. The microstructure, phase composition, hardness and wear properties of the coating were investigated by SEM, XRD, microhardness tester and wear testing machine. The results indicate that TiC-VC particles can be obtained by direct metallurgical reaction among ferrotitanium, ferrovanadium and graphite during laser cladding process. The prepared cladding layer is mainly composed of （Fe, Ni） solid solution and TiC-VC composite carbides. The cladding layer and high chromium east iron matrix forms good metallurgical combination. The best combination is that Ti：V：C （molar ratio） is 0.4：0.6：1.2, laser power is 2.4 kW, and laser scanning speed is 250 mm/min, then the hardness of the coating is 824.5HV, and the relative wear resistance is 2.32.

关 键 词：原位合成 TIC-VC 显微硬度 相对耐磨性 

分 类 号：TG174[金属学及工艺—金属表面处理]