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应用FLUENT软件建立BT20激光熔凝过程的数学模型,考虑材料热物性能参数与温度的非线性关系以及边界条件,分析表面张力温度系数和激光功率对激光熔池内的温度分布,流动状态及熔池形貌的影响,并与试验结果进行对比。结果表明,表面张力温度系数影响熔池内熔化凝固的过程,表面张力温度系数的增大使熔池变宽变窄。随着功率的增加,熔池尺寸扩大,工件温度提高,熔池流体流动加速,数值模拟结果与试验结果相吻合。
The mathematical model of BT20 laser melting process was established by using FLUENT software. Considering the non-linear relationship between material parameters and temperature, and the boundary conditions, the temperature distribution and the flow state of the molten pool were analyzed. Morphology, and compared with the test results. The results show that the temperature coefficient of surface tension affects the process of melting and solidification in the weld pool. The increase of temperature coefficient of surface tension makes the weld pool wider and narrower. With the increase of power, the size of the weld pool is enlarged, the temperature of the workpiece is increased, and the fluid flow in the weld pool is accelerated. The numerical simulation results are in good agreement with the experimental results.