摘要
综合考虑了随温度变化而变化的热传导、比热容等热物性参数的作用,基于ANSYS平台建立了连续移动的三维瞬态多道直接激光金属烧结温度场的有限元模型。利用APDL参数化设计语言实现热源移动,利用焓处理相变潜热的影响,对镍基合金粉末的烧结成型温度场进行了模拟,系统分析了熔池的加热及温度场随时间的变化规律。模拟结果表明:随着时间的增加,由于热积累效应使得熔池的温度越来越高;彗星状温度云图的最高温度并不在激光光斑中心而是稍微滞后;随着烧结过程的进行,随后的烧结道具有越来越大的热影响区域,但烧结的宽度和深度没有太大的变化。
In this paper, we discussed these factors such as heat temperature-dependent thermal conduction and heat capacity, the continuous moving and 3D transient finite element model of the temperature field of multi track direct laser metal sintering has been established based on ANSYS software. The moving laser beam is simulated with the employment of APDL （ANSYS Parametric Design Language） and the effect of phase-change latent heat has been considered by using enthalpy. The sintering temperature field of Nickels-based alloy power has been simulated. The heating process and temperature field changeable process with time of molten pool have been carefully analyzed. The simulation results show that with the time increasing, the temperature of the molten pool become higher because of the heat accumulative effect, the position of the highest temperature point of the comet-shape temperature nephogram is not in the center point of the laser beam but slightly lagged, comparing with the previous track, the latter one has larger heat affected region, but the sintering width and depth don＇t change visibly.
出处
《应用激光》
CSCD
北大核心
2010年第4期284-290,共7页
Applied Laser
关键词
直接激光金属烧结
温度场
ANSYS参数化设计语言
有限元模拟
direct laser metal sintering
temperature field
ANSYS parametric design language
finite element simulation
