中文摘要：

采用激光熔覆方法在45#钢基体上制备含TiC质量分数为20%~50%的Fe基TiC复合涂层。分别用扫描电镜（SEM）、能谱仪（EDS）、X线衍射（XRD）、显微硬度计、摩擦磨损机对熔覆层的微观组织、物相、硬度及耐磨性进行研究。结果表明：当TiC质量分数为30%时,涂层组织致密,TiC颗粒分布均匀、部分溶解、尺寸减小;涂层主要是由α-Fe固溶体,Fe C,Fe B,B4C,B4Si,Cr5B3,Ti B以及未溶解的TiC等组成;当TiC质量分数为30%时,熔覆层平均维氏硬度为783.8,磨损率为45#钢基体的1/38。

英文摘要：

Fe-based TiC coatings with TiC mass fraction of 20%-50% was deposited by laser cladding technology on 45？steel substrate. Scanning electron microscope（SEM）, energy dispersive spectrometer（EDS）, X-ray diffraction（XRD）, microhardness tester, friction wear testing machine were used to investigate the microstructure, phases, microhardness and wear resistance of the coatings. The results show that when the coatings contain 30% TiC, the coating structure is compact, TiC particles in the coating are distributed uniformly and partly dissolve, and the size of TiC particle decreases. The coatings are mainly composed of α-Fe, Fe C, Fe B, B4 C, B4 Si, Cr5B3, Ti B and undissolved TiC. Coating＇s average microhardness is 783.8 and the rate of wear is 1/38 of 45 steel substrate when the contents of TiC is 30%.