摘要
利用ANSYS有限元软件对选区激光熔化(Selective Laser Melting,SLM)成形过程的三维瞬态温度场的分布变化进行了数值模拟;在考虑材料的热物性参数随温度变化和相变非线性行为的情况下,建立了选择性激光熔化(SLM)的三维温度场有限元模型;并利用ANSYS参数化设计语言(APDL)实现了激光高斯热源的移动加载。模拟结果表明:随着扫描时间的增加,由于热积累效应,熔池的温度越来越高,热影响区也随之增大;熔化成形过程中,光斑中心的前端存在较大的温度梯度;扫描速度小,容易造成液相的流动,出现孔洞,扫描速度过大,则粉末不能完全熔化;模拟得到的结果与实验结果相吻合。
This article uses ANSYS to simulate distribution of the temperature field in selective laser melting. A three-dimensional transient thermal finite model of SLM is established based on latent heat due to phrase transformation from powder to liquid and thermo physical of materials considered to be temperature-dependent. By using the ANSYS parameter design language （APDL）, the moving of laser beam can be controlled. The simulation results show that with the time increasing, the tempera ture of the molten pool becomes higher and HAZ becomes bigger because of the heat accumulative effect, great temperature gradients exist in the front of laser spot, and that liquid phase flows easily and holes appear because of slow scanning speed, contrarily, the powder can not be melted completely. These agree with the experimental results well.
出处
《应用激光》
CSCD
北大核心
2007年第6期456-460,共5页
Applied Laser
基金
华中科技大学博士后基金项目(项目编号:20070024)
国家科技型中小企业创新基金资助项目(项目编号:05C26214201059)
关键词
选区激光熔化
有限元模型
ANSYS参数化设计语言
熔池
液相
Selective laser melting
finite element model
ANSYS parameter design language
molten pool
liquid phase
