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。
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.
出处
《热加工工艺》
CSCD
北大核心
2010年第24期182-185,共4页
Hot Working Technology
