基于不同搭接率的激光熔覆温度场数值模拟研究

Numerical simulation of temperature field in laser cladding for different overlap rate

搭接率是优化激光熔覆质量的一个重要工艺变量,为探究温度场特征,利用ANSYS有限元分析软件对0、1/3、1/2搭接率条件下的激光熔覆模型展开数值模拟研究,求解温度场。分析结果表明:激光束的热辐射是熔池形成的主因;各搭接率条件下基材的等温轮廓线均呈近似"椭圆"形状,搭接率的调整会显著影响其温度分布区间,另外基材各区域会承受不同的温度载荷,如峰值温度、热循环周期等,增大搭接率会提升基材整体的温升幅值。

Overlap rate was a one of key process variables to optimize the quality in laser cladding process. To explore the characteristics of temperature field, ANSYS FEM software was used to simulate the laser cladding model with 0, 1/3, 1/2 overlap rete, then the temperature field was solved. The results showed that heat radi- ation from laser was the main cause of the molten pool. Isothermal contours of substrate corresponding to each overlap rate showed ＂oval＂ shape approximately, and the temperature distribution was influenced dramatically by adjustment of overlap rate. Furthermore, each region in substrate was subjected to different temperature load, such as peak temperature, heat cycle, etc. The overall temperature of substrate was increased by the raise of overlap rate.