金属粉末激光烧结温度场的三维有限元模拟

综合考虑热传导、热辐射和热对流及变热物性参数,基于ANSYS平台建立了连续移动的三维瞬态金属粉末直接激光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,对水雾化铁粉的烧结成型温度场进行了模拟,系统分析了激光熔池的加热和冷却规律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激光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;模拟结果显示烧结过程中将产生液相,这与先前的实验结果吻合较好。

3D Finite Element Simulation for Temperature Field of Direct Metal Laser Sintering

Through the comprehensive analysis for these factors such as heat conduction, heat radiation, heat convection and changeable thermal property parameters, the continuous moving and 3D transient state FE model of the temperature field of direct metal laser sintering has been established based on ANSYS software. Thermal resource moving has carried out by using APDL(ANSYS Parametric Design Language) and the effect of phase-change latent heat has been considered by using enthalpy. The sintering temperature field of water atomization Fe power has been simulated, the heating-cooling process and temperature field changeable process with time of laser 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 and it produce liquid phase in the sintering process which agrees with the previous experimental result well.