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用金相检测法和能量平衡方程 ,推导并计算了激光熔覆过程中单位质量熔覆材料的比能Er和单位时间实际输入比能 Eh,合理地解释了粉末有效利用系数、熔覆层稀释率随工艺参数变化的规律。结果表明 ,在激光参数不变的条件下 ,稀释率随扫描速度和送粉速率的增加而减小 ;粉末有效利用系数随扫描速度和送粉速率的增加而加大。熔覆材料损失机制主要是由于过热引起的烧损
The specific energy Er of the unit mass cladding material and the actual input specific energy Eh per unit time during the laser cladding were deduced and calculated by the metallographic examination method and the energy balance equation. The effective utilization coefficient of the powder, the dilution of the cladding layer The rate of change with the process parameters. The results show that under the same laser parameters, the dilution rate decreases with the increase of scanning speed and powder feeding rate. The effective utilization coefficient of powder increases with the increase of scanning speed and powder feeding rate. The mechanism of material loss is mainly due to overheating caused by burning