以磨损失效扁平链为研究对象,采用铁基合金粉末对基体进行了激光熔覆试验,在不同的熔覆工艺参数下,进行了金相组织、显微硬度和耐磨性分析。结果表明,激光功率1600 W、扫描速度600 mm·min ^-1、送粉率4.0 rad·min ^-1、熔覆层数3的组合为最优工艺参数组合。在此工艺参数组合下,熔覆层与基体形成良好的冶金结合,无气孔等缺陷,且硬度和耐磨性均优于基体的。

With a flat chain with the wear failure as the research object, the experiment of laser cladding for the matrix is carried out by using the Fe-based alloy powder. The metallographic structure, micro-hardness and wear resistance under different cladding process parameters are analyzed. The parameters with a laser power of 1600 W, a scanning speed of 600 mm·min -1, a feeding rate of 4.0 rad·min -1 and a cladding layer number of 3 are the optimal process parameter set. Under this parameter set, the cladding layer has a good metallurgical bonding with its matrix , has no pores and other flaws, and has the hardness and wear resistance which are better than those of the matrix.