激光熔覆TiC增强铁基耐磨涂层组织结构的研究
Study on Microstructure of TiC Reinforced Iron Based Composite Coating Prepared by Laser Cladding
杜宝帅1, 邹增大2, 王新洪2, 张忠文1
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作者单位：(1. 山东电力研究院, 山东 济南 250002; 2. 山东大学 材料科学与工程学院, 山东 济南 250061)
中文关键字：激光熔覆； TiC； 原位自生； 复合涂层
英文关键字：laser cladding; TiC; in-situ; composite coating
中文摘要：采用钛铁和石墨作预置粉末，利用激光熔覆技术在碳钢基体上制备TiC增强铁基耐磨复合涂层。采用X射线衍射仪、扫描电镜及能谱分析仪对涂层物相组成和显微组织进行研究，并利用显微硬度计测试了涂层硬度。结果表明，TiC增强相通过熔池冶金反应原位生成，随着涂层中Ti、C原子比例的不同，涂层增强相含量和物相结构发生相应演变，所得TiC呈枝晶状和花瓣状均匀分布于涂层中。与被强化基体相比，熔覆层的硬度得到显著提高。
英文摘要：TiC reinforced iron based composite coating was prepared by laser cladding and using ferrotitanium and graphite as precursor. Microstructure and phase constituents were studied using X-ray diffractometer, scanning electron microscopy and energy dispersive spectroscopy. Hardness was measured using Vikers' microhardness tester. The results show that TiC is in-situ formed through the metallurgical reation in the melt pool. Amount of reinforcements and phase constituents of the coating vary with the changing of Ti : C ratio in the precursor. Dendritic and fishbone-like TiC distributes uniformly in the coating. Compared with the substrate, hardness of the cladding layer improves significantly.