基于ANSYS的SnTe热电材料选区激光熔化数值模拟及实验研究

Numerical Simulation and Experiment Study of Selective Laser Melting of Thermoelectric Material SnTe Based on ANSYS

基于ANSYS软件建立了SnTe热电材料选区激光熔化单层多道面扫描的三维有限元模型(FEM),采用移动的高斯面热源,考虑材料的物性参数随温度的非线性变化以及相变潜热的影响,得到不同扫描方式下SnTe粉体材料成形过程中的熔池热行为及应力分布,并采用相关实验进行验证。结果表明:不同扫描方式对熔池的宽度、深度以及气化程度影响不大,但分区蛇形扫描能够大幅增加熔池长度、减小温度梯度、降低冷却速率。采用分区蛇形扫描时σx(扫描方向应力)拉应力最小,为583 MPa,且扫描道中间位置的应力得到了释放。本研究为SnTe热电材料SLM过程工艺参数的优化提供了理论指导,也为其他激光非平衡制备技术的改进提供了新的研究思路。

Based on ANSYS software,a three-dimensional single-layer multi-pass surface scanning finite element model(FEM)for selective laser melting of SnTe thermoelectric material was established.Considering the nonlinear change of physical property parameters of material with temperature and the latent heat of phase transition,the thermal behavior and stress distribution of the molten pool during the forming process of SnTe powder material under different scanning strategies were obtained by adopting moved Gauss surface heat source.And the relevant experiment was carried out to verify the simulation result.The results show that different scanning methods have little effect on the width,depth and gasification degree of the molten pool.However,the zoning snakelike scanning can greatly increase the pool length,reduce the temperature gradient and reduce the cooling rate σx is minimum when zoning snakelike scanning is adopted,which is 583 MPa,and the stress at the middle of scanning pass is released.This study has laid a theoretical foundation for the optimization of SLM process parameters of SnTe thermoelectric material and provides a new route for the improvement of other laser nonequilibrium manufacturing technologies.