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实验涂层材料以亚微米级TiC和Cr_xC_y为强化硬质相,Fe-Cr合金为其基础粘结相,并加入特定含量的Si元素,运用激光合金化技术,在球墨铸铁表面制备出高硬度的合金化层。利用XRD、SEM、EDS等分析不同Si含量激光合金化层的相组成及显微组织,并测试其维氏硬度。结果表明:激光合金化层表面平整,并与基体实现了良好的冶金结合,形成以莱氏体与马氏体为主的显微组织;随着硅含量的提高,相和组织发生了一定变化,合金化层硬度也随之提高。
Experimental coating materials with sub-micron TiC and Cr_xC_y as the hard phase, Fe-Cr alloy as the basic binder phase, and adding a specific content of Si elements, the use of laser alloying technology, prepared in the ductile iron surface hardness Of the alloy layer. The phase composition and microstructure of the laser alloying layer with different Si content were analyzed by XRD, SEM and EDS. The Vickers hardness of the laser alloyed layer was also tested. The results show that the surface of the laser alloying layer is smooth and the metallurgical bond with the substrate is good, and the microstructure of the laser alloying layer is dominated by ledeburite and martensite. With the increase of the silicon content, the phase and the microstructure are changed , Alloying layer hardness also increases.