金属粉末选区激光熔化单道扫描热应力场的数值模拟
Numerical Simulation on Thermal-stress Distribution of Metal Powders Selective Laser Melting Single-track Scanning
任 忠1, 王东东1, 白培康1, 马国云2
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作者单位:1.中北大学 材料科学与工程学院,山西 太原 030051;2.沈机集团昆明机床股份有限公司,云南 昆明 650203
中文关键字: 选区激光熔化; 有限元模拟; 快速原型/制造; 热应力场
英文关键字: selective laser melting (SLM); finite element simulation; rapid prototyping and manufacturing;thermal-stress field
中文摘要:针对选区激光熔化工艺输入的局部集中的移动激光热源造成选区激光烧结过程中应力场分布不均匀、不稳定的问题,以316钢粉末为烧结材料利用有限元分析软件ANSYS对激光烧结应力场进行了数值模拟, 通过改变单元属性的方法,解决材料的熔化、凝固问题并对模拟结果进行了实验验证。结果表明,激光烧结过程中,在光斑中心的前端存在着极大的热应力,这与实验结果基本一致。
英文摘要:Selective laser melting (SLM) is a rapid prototyping process for direct product realization from metal powders or ceramic materials. The regional input high power laser beam inevitably leads to inhomogeneous and instable thermal-stress field of SLM process. ANSYS software was used to simulate the thermal-stress field in SLM using 316 stainless steel powder. The problems of the fusion and solidification of material were solved by changing the element material. The results show that great thermal-stress exists in the front of laser spot. And the simulation results are in agreement with experimental results.