论文部分内容阅读
试验涂层材料采用亚微米级TiC和铬的复合碳化物作为强化硬质相,Fe-Cr合金作为基础粘结相,并加入质量分数为20%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。通过扫描电镜,能谱分析、X光物相分析及显微硬度测定,对激光表面合金化层的显微组织及合金元素的分布进行了研究。试验结果表明,合金化层与基体实现了冶金结合,并形成了以莱氏体与马氏体为主的显微组织,激光合金化层中的细晶强化和固溶强化等强化作用使球铁表面的显微硬度得到了显著提高。
The experimental coating material uses composite carbide of submicron TiC and chromium as strengthening hard phase, Fe-Cr alloy as basic bonding phase, adding 20% Si element, using laser alloying technology, Cast iron surface preparation of high hardness alloy layer. The microstructure and alloying elements distribution of laser alloying layer were studied by scanning electron microscopy, energy dispersive spectroscopy, X-ray phase analysis and microhardness measurement. The experimental results show that the alloying layer and the matrix achieve metallurgical bonding, and the formation of a microstructure mainly composed of martensite and ledeburite. In the laser alloying layer, fine strengthening and solid solution strengthening can strengthen the ball The microhardness of the iron surface has been significantly improved.