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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。
Titanium-iron and graphite were used as the preset powder, and TiC-reinforced iron-based wear-resistant composite coating was prepared on the carbon steel by laser cladding. The phase composition and microstructure of the coating were studied by X-ray diffraction, scanning electron microscopy and energy spectrum analyzer. The hardness of the coating was measured by micro-hardness tester. The results show that the TiC phase is formed in situ by the metallurgical reaction of molten pool. With the different proportion of Ti and C atoms in the coating, the phase content and the phase structure of the coating evolve accordingly. The obtained TiC dendrites and petals Evenly distributed in the coating. Compared with the strengthened matrix, the hardness of the cladding is significantly increased.