激光选区熔化高强铝合金热行为模拟研究  

Simulation of Thermal Behavior of Selective Laser Melting High Strength Aluminum Alloy

作　　者：杨雪慧 张争艳[1] 王顺 Yang Xuehui;Zhang Zhengyan;Wang shun(School of Mechanical Engineering,Hebei University of Technology,Tianjin 300130)

机构地区：[1]河北工业大学机械工程学院,天津300130

出　　处：《激光与光电子学进展》2022年第23期179-185,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61802108);河北省自然科学基金(E2017202296)。

摘　　要：针对高强铝合金利用选区激光熔化技术成形困难的问题,基于ANSYS软件进行有限元分析研究激光选区熔化变形铝合金,揭示了成形过程中温度场分布与基本特征,并通过温度分布云图研究了扫描道的温度梯度变化。同时,研究了激光功率和扫描速度对熔池热行为的影响,借助仿真研究了扫描工艺参数对熔池形态变化的影响规律。结果发现:在仿真成形过程中,熔池尺寸与扫描速度呈非线性变化关系,与激光输入的线能量密度呈正相关,随着能量密度的增加,尺寸增加。通过试验对该模拟结果进行验证,此研究可以为后续的成形分析提供理论参考。Aiming at the difficulty of forming high strength aluminum alloys by selective laser melting technology,this paper conducts finite element analysis based on ANSYS software to study the selective laser melting of aluminum alloys,and reveals the temperature field distribution and basic characteristics during the forming process.And the temperature gradient of the scan track is studied through the temperature distribution cloud map.At the same time,the influence of laser power and scanning speed on the thermal behavior of the molten pool was studied,and the influence of the scanning process parameters on the shape of the molten pool was studied by means of simulation.The results show that in the simulation forming process,the size of the molten pool has a nonlinear relationship with the scanning speed,and is positively related to the linear energy density of the laser input.As the energy density increases,the size increases.The simulation results are verified by experiments,and this study can provide a theoretical reference for subsequent forming analysis.

关 键 词：激光光学 选择性激光熔化 数值模拟 高强铝合金 熔池形态 热行为 

分 类 号：TG665[金属学及工艺—金属切削加工及机床] TG146.21[一般工业技术—材料科学与工程]