为了得到激光熔覆Ni35WC11涂层的最优工艺参数,采用单因素控制法,以激光功率、送粉量、扫描速度三种工艺参数作为控制变量,将熔覆层的稀释率、高度和宽度作为参考指标,进行了正交极差分析。结果表明:送粉量、扫描速度、激光功率对参考指标的影响逐渐减小;通过单因素和正交分析得到的最优参数为激光功率为1500 W,送粉量为2 g/s,扫描速度为4 mm/s。根据该参数制作样本,得到的熔覆层硬度为710 HV左右,自腐蚀电位为-0.72 V,自腐蚀电流密度为0.96 A/cm 2,表明了在最优参数下得到的熔覆层硬度高、组织均匀、耐腐蚀性强。

In order to obtain optimal process parameters of the laser cladding Ni35WC11 coating, a single factor control method is adopted. Three process parameters, including laser power, powder feeding rate and scanning speed, are used as control variables. The dilution ratio, height and width of the cladding layer are used as reference indexes for orthogonal range analysis. The results show that the influences of powder feeding rate, scanning speed and laser power on the reference indexes decrease gradually. The optimal parameters obtained by single factor and orthogonal analysis are laser power of 1500 W , powder feeding rate of 2 g/s and scanning speed of 4 mm/s. Samples are prepared according to these parameters. The hardness of the as-prepared cladding layer is about 710 HV, the self-corrosion potential is -0.72 V, and the self-corrosion current density is 0.96 A/cm ², indicating the cladding layer obtained under optimal parameters has high hardness, uniform structure, and strong corrosion resistance.