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金属粉末的直接选区激光烧结温度场数值模拟 被引量：16

Numerical Simulation of Thermal Distribution in Direct Metal Laser Sintering
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摘要 金属粉末的直接选区激光烧结(DMLS)过程中存在着相变潜热,在考虑相变潜热的作用下,基于金属粉末烧结成形建立了一种三维的瞬态有限元模型,该模型还考虑了随温度变化而变化的热传导、自然对流和辐射的影响。采用ANSYS参数化设计语言处理移动热源,用焓处理相变潜热的影响。以25号钢粉末为烧结材料进行了数值模拟,模拟结果表明:激光烧结过程中,在光斑中心的前端存在着极大的温度梯度;光斑中心的温度高于金属粉末的熔点,烧结过程中存在液相。 A three-dimensional transient thermal finite element model of direct metal laser sintering (DMLS) was established based on latent heat due to phase transformation from powder to liquid. The model relates to the effects of the temperature-dependent thermal conduction, natural convection, and radiation. The moving laser beam was simulated with the employment of ANSYS parametric design language and latent heat was considered by using enthalpy. The simulation was conducted by using steel 25 powder. Results show that great temperature gradients exist in the front of laser spot, and phase transformation temperature of powder around laser spot is higher than the powder's melting point.
作者 沈显峰 姚进 王洋 杨家林 汪法根
机构地区 四川大学制造科学与工程学院 中国工程物理研究院机械制造工艺研究所
出处 《光电子．激光》 EI CAS CSCD 北大核心 2005年第4期492-495,共4页 Journal of Optoelectronics·Laser
基金 中国工程物理研究院基金重大项目(2002Z0303)
关键词 选区激光烧结 金属粉末 数值模拟 温度场 相变潜热 烧结过程 光斑中心 有限元模型 参数化设计 ANSYS 粉末烧结 温度变化 自然对流 移动热源 语言处理 烧结材料 模拟结果 温度梯度 热传导 极大的 瞬态 Computer simulation Enthalpy Finite element method Heat conduction Laser applications Phase transitions Powder metals Rapid prototyping Steel Temperature distribution Three dimensional
分类号 TK124 [动力工程及工程热物理—工程热物理] TQ174 [化学工程—陶瓷工业]
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参考文献9

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二级参考文献8

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共引文献7

同被引文献119

引证文献16

二级引证文献80

光电子．激光
2005年 第4期

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