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电磁搅拌制备2A50铝合金半固态坯料的数值模拟与实验研究

Numerical Simulation and Experimental Investigation of the Preparation of Aluminium Alloy 2A50 Semi-Solid Billet by Electromagnetic Stirring.

作者信息

Wang Yongfei, Zhao Shengdun, Guo Yi

机构信息

School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China.

State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Hangzhou 310027, China.

出版信息

Materials (Basel). 2020 Nov 30;13(23):5470. doi: 10.3390/ma13235470.

DOI:10.3390/ma13235470
PMID:33266336
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7730590/
Abstract

Electromagnetic stirring (EMS) has become one of the most important branches of the electromagnetic processing of materials. However, a deep understanding of the influence of the EMS on the thermo-fluid flow of the aluminium alloy melt, and consequently the refinement of the microstructure is still not available. This paper investigated the influence of the operating parameters of EMS on the magnetohydrodynamics, temperature field, flow field, and the vortex-shaped structure of the melt as well as the microstructure of the aluminium alloy 2A50 billet by numerical simulation and experiments. The operating parameters were categorised into three groups representing high, medium, and low levels of Lorentz forces generated by EMS. The numerical simulation matched well with the experimental result. It was found that a high level of EMS can improve the uniformity of the temperature and flow fields. The maximum speed was observed at the radius of around 25 mm under all EMS levels. Both the depth and diameter of the vortex-shaped structure generated increased with the enhancement in the EMS level. The average grain size of the edge sample of the billet was reduced by 48.3% while the average shape factor was increased by 51.0% under the medium-level EMS.

摘要

电磁搅拌（EMS）已成为材料电磁加工最重要的分支之一。然而，对于EMS对铝合金熔体热流体流动的影响以及由此对微观结构细化的深入理解仍然不足。本文通过数值模拟和实验研究了EMS操作参数对磁流体动力学、温度场、流场、熔体的涡旋状结构以及2A50铝合金铸坯微观结构的影响。操作参数分为三组，分别代表由EMS产生的高、中、低水平的洛伦兹力。数值模拟与实验结果吻合良好。研究发现，高水平的EMS可以提高温度场和流场的均匀性。在所有EMS水平下，最大速度出现在半径约25mm处。随着EMS水平的提高，产生的涡旋状结构的深度和直径均增加。在中等水平的EMS下，铸坯边缘样品的平均晶粒尺寸减小了48.3%，而平均形状因子增加了51.0%。

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