首页|选区激光熔化Al-Mg-Sc-Zr合金温度场和应力场有限元模拟

选区激光熔化Al-Mg-Sc-Zr合金温度场和应力场有限元模拟

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为研究选区激光熔化Al-Mg-Sc-Zr合金的温度场和应力场,建立三维有限元分析模型.在考虑粉末-固体转变、材料热物理性能参数随温度变化、相变潜热和熔池对流的基础上,研究激光功率、点间距和扫描间距对温度场分布、熔池尺寸和残余应力场分布的影响.然后,采用实验法探讨激光功率、点间距和扫描间距对合金组织、相对密度和硬度的影响.结果表明:随着激光功率增大、点间距减小和扫描间距的减小,熔池尺寸逐渐增大.残余应力主要分布在第一个扫描道次的中间以及每一个扫描道次的起点和终点.实验结果证明有限元模拟的有效性.随着激光功率增大、点间距减小和扫描间距减小,试样的致密度先增大后减小.试样的最佳工艺参数区间为激光功率325～375 W、点间距80～100µm和扫描间距80µm.
Finite element analysis of temperature and stress fields during selective laser melting process of Al-Mg-Sc-Zr alloy
A 3D finite element model was established to investigate the temperature and stress fields during the selective laser melting process of Al-Mg-Sc-Zr alloy. By considering the powder-solid transformation, temperature- dependent thermal properties, latent heat of phase transformations and molten pool convection, the effects of laser power, point distance and hatch spacing on the temperature distribution, molten pool dimensions and residual stress distribution were investigated. Then, the effects of laser power, point distance and hatch spacing on the microstructure, density and hardness of the alloy were studied by the experimental method. The results show that the molten pool size gradually increases as the laser power increases and the point distance and hatch spacing decrease. The residual stress mainly concentrates in the middle of the first scanning track and the beginning and end of each scanning track. Experimental results demonstrate the accuracy of the model. The density of the samples tends to increase and then decrease with increasing laser power and decreasing point distance and hatch spacing. The optimum process parameters are laser power of 325-375 W, point distance of 80-100 µm and hatch spacing of 80 µm.

aluminum-magnesium alloyAl-Mg-Sc-Zr alloyselective laser meltingfinite element analysistemperature fieldstress field

马如龙、彭超群、蔡志勇、王日初、周朝辉、李晓庚、曹玄扬

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中南大学材料科学与工程学院,长沙 410083

中南大学轻质高强结构材料重点实验室,长沙 410083

长沙新材料产业研究院有限公司,长沙 410083

Al-Mg合金 Al-Mg-Sc-Zr合金 选区激光熔化 有限元分析 温度场 应力场

National Natural Science Foundation of ChinaChina PostdoctoralNatural Science Foundation of Hunan Province,ChinaNational Key Laboratory of Science and Technology on High-strength Structural Materials,China

518043492018M6329862019JJ50766JCKY201851

2021

10.1016/S1003-6326(21)65703-5

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCDCSCDSCI
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2021.31(10)
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