运用激光熔覆的方法在中碳钢表面原位合成制备了颗粒增强铁基复合涂层。通过调整两种强碳化物形成元素Ti和Zr的相对含量,研究了不同配比下原位自生碳化物颗粒相的分布特征。结果表明,在总量一定的情况下,复合添加Ti和Zr可以提高颗粒分布密度和颗粒相面积比。其中,以Ti和Zr的质量比为1∶1时得到的颗粒密度最大、颗粒尺寸分布最均匀。同时对不同的颗粒分布状态下涂层的显微硬度进行了研究。

Fe-based composite coatings reinforced by in situ synthesized particles have been produced by laser cladding on the surface of medium carbon steel. The distributions of carbide particles were studied by varying relative percents of Titanium and Zirconium which are strong carbide-forming elements(SCFEs). It shows that in a certain total amount of SCFEs,the density and area ratio of particles can be improved by multiply adding Ti and Zr into the cladding powders. Among of different proportions,the density of the particles are largest and the size are the most uniform when the mass ratio Ti∶Zr=1∶1. The microhardness of coatings with different particle distributions were also investigated.