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采用CO_2激光熔覆工艺在304不锈钢表面制备含Ti(C,N)增强相的铁基熔覆层。利用光学显微镜、X射线衍射仪、扫描电镜、维氏显微硬度计和电化学工作站对熔覆层的组织和性能进行表征分析。结果表明:熔覆层呈典型的树枝晶形貌组织,与基体形成了良好的冶金结合。钛铁粉末与石墨、氮气在激光熔覆过程中发生了原位反应,生成了Ti(C,N)增强相。熔覆层主要由γ-Fe、α-Fe、Ti(C_(0.3)N_(0.7))、Fe-N等物相组成。熔覆层的平均硬度值为450 HV0.2,是基体硬度(240 HV0.2)的近2倍。抗电化学腐蚀性能是304不锈钢基材的1.43倍。
An iron-based cladding layer containing Ti (C, N) reinforcing phase was prepared on the surface of 304 stainless steel by CO2 laser cladding. The microstructure and properties of the coatings were characterized by optical microscope, X-ray diffraction, scanning electron microscopy, Vickers hardness tester and electrochemical workstation. The results show that the cladding layer is a typical dendritic structure and forms a good metallurgical bond with the matrix. The Ti (C, N) reinforced phase was formed by in situ reaction of ilmenite with graphite and nitrogen during laser cladding. The coating mainly consists of γ-Fe, α-Fe, Ti (C_ (0.3) N_ (0.7)) and Fe-N phases. The average hardness of the cladding is 450 HV0.2, which is nearly twice the hardness of the matrix (240 HV0.2). Anti-electrochemical corrosion performance is 1.43 times that of 304 stainless steel substrate.