激光烧结Si／Fe混合粉末材料的温度场有限元模拟

利用ANSYS工具建立了选择性激光烧结热电功能材料β-FeSi2的三维瞬态温度场有限元模型，模型中考虑了混合材料热物性参数随温度与孔隙率的变化和材料相变过程对温度场的影响。系统分析了选择性激光烧结二元粉末内部温度场随时间和空间的变化规律，通过该有限元模型可以分析二元粉末激光烧结过程中激光热能在粉床内部的传输规律。模拟结果表明，随烧结深度增加，粉床内部温度和温度梯度迅速衰减，粉床内部温度场在深度方向呈漏斗状梯度分布，粉层内部热影响区域最深的位置滞后于激光束中心。在已烧结区域，粉层内部存在一个均匀分布的高温体积区间。对此粉层区域温度的研究将为实验中控制烧结材料相变过程与性能提供依据。

Finite element simulation of temperature field in Si/Fe powder mixtures during selective laser sintering

A three- dimensional transient finite element model has been established basing on-ANSYS to calculate the temperature distribution during selective laser sintering （SLS） β-FeSi2 thermoelectric material. The model allows for the evolution of effective thermal physical properties due to temperature and porosity, and the influence of phase change on temperature field. The analysis of time - space dependent temperature field within two - component powder bed during SIS is also conducted. The process of laser energy delivery into powder bed during SIS can be analyzed by the finite element model. The simulated results show the temperature and temperature gradient docrease rapidly with increase in the sintering depth, the internal temperature distribution shapes like a funnel along die longitudinal section, The position of the deepest heat affected zone is slightly lagged the center of the laser beam. There is a flat and high temperature distribution within the sintered region. The investigation of the temperature distribution within powder bed would provide the direction to control the phase change process and the performance of the sintered material.