送粉式激光熔覆温度场有限元分析

采用有限元方法建立了送粉式激光熔覆过程温度场分析的数学模型，模拟了熔覆过程温度场的分布情况，模拟结果与试验结果基本吻合，表明可以采用此计算方法提供的初始温度值和非接触测量温度变化量来控制激光熔覆工艺参数。模拟结果发现，激光熔覆过程表现为急热急冷的特征；温度梯度较大，最大温度梯度出现在熔池附近和熔覆层与基体交界的边界处。

Finite Element Analysis of Temperature Field in Feeding Powder Laser Cladding

The mathematical model of the temperature field of feeding powder laser cladding was found by finite element method. In the cladding process, the distribution of temperature field was simulated, the simulation results were in accordance with experimental results, and showed that this method could be used for controlling laser cladding process parameters by calculating the initial temperature and non-contact measurement of the temperature variation. Simulation results show that the laser cladding process has a characteristic of speedy heat and cool. The temperature gradient is larger, the largest temperature gradient is in the vicinity of melt pool and the border of cladding layer and the substrate.