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利用金相检测法建立了送粉式激光熔覆过程中反映熔覆层宏观参数、工艺参数之间相互关系的粉末有效利用系数的方程。确定了作用时间内粉末有效利用系数的计算方法 ,系统分析了影响粉末有效利用系数的因素。为定量描述熔覆层与基体材料在界面的结合状态 ,提出了冶金结合系数的概念。在激光功率、光斑尺寸保持不变的条件下 ,作用时间内的粉末有效利用系数随扫描速度的增加而增大 ,随送粉速率的增加而增大。对粉末有效利用系数随扫描速度的变化出现最大值的现象给出了合理的解释
The equation of effective utilization coefficient of powder, which reflects the relationship between macroscopic parameters and process parameters of cladding layer, was established by metallographic examination method. The calculation method of the effective utilization coefficient of powder during the working time was determined, and the factors affecting the effective utilization coefficient of the powder were systematically analyzed. In order to quantitatively describe the bonding state of the cladding layer and the matrix material at the interface, the concept of the metallurgical bonding coefficient is proposed. Under the conditions of constant laser power and spot size, the effective utilization factor of powder increases with the increase of scanning speed and increases with the increase of powder feeding rate. A reasonable explanation is given for the phenomenon that the effective utilization factor of powder appears with the change of the scanning speed