送粉激光熔覆中送粉速率对激光束与粉末流相互作用的影响

引入经典光学理论计算激光束与粉末流的相互作用，藉此研究了送粉速率对工件表面激光强度分布和不同位置颗粒温度的影响。计算结果表明：随送粉速率的增加，激光强度以及颗粒温度的最高值都显著降低：同时，激光强度分布和不同位置颗粒温度趋于均匀。由于对激光熔池中动力学过程的潜在影响，这些结果应在描述激光熔覆过程的数学模型中加以考虑。

Effect of Powder Feeding Rate on Interaction between Laser Beam and Powder Stream in Laser Cladding Process

The classical optical theory was introduced to calculate the interaction between laser beam and powder stream, on the basis of which the effect of powder feeding rate on the laser intensity and temperature of the particles at different sites on the surface of the workpiece was investigated. It is shown that the peak values of both laser intensity and particle temperature decrease with increasing the powder feeding rate. And simultaneously, the laser intensity distribution and the temperature of the particles at different sites on the surface of the workpiece tend to be even. It is suggested that such results should be considered in model of laser cladding due to their subtle effects on the dynamic processes in laser molten pool.