基于焓方法发展的二维轴对称数学模型,考虑了激光束能量的时间和空间分布以及材料的变热物性影响,模拟了激光加工中材料的传热和相变过程,并分别计算了高斯光束及平面圆形光束作用于纯铁时材料内部的气液及固液界面随时间的发展及非稳态温度场演化。

An axisymmetric model has been developed to simulate conduction phase change during laser processing based on enthalpy method. The spatial and temporal profile of the laser beam and the temperature dependent properties of the material have been taken into account in the model. A Gaussian beam and a flat beam are used, respectively, to simulate the interaction with iron as target and the results for vapor-liquid and liquid-solid interface evolutions and temperature field development in the material are obtained.