Refinement of Solidification Structure of 7A04 Aluminum Alloy by Rectangular Wave Magnetic Field

Feng Yanfei; Wang Jun; Bai Qingwei; Bao Xinyu; Yu Wenxia; Ma Yonglin

doi:10.15980/j.tzzz.2017.11.026

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Refinement of Solidification Structure of 7A04 Aluminum Alloy by Rectangular Wave Magnetic Field
Vol. 37, Issue 11, Pages: 1254-1258(2017)
Published： 2017 ，
DOI： 10.15980/j.tzzz.2017.11.026

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[1]冯艳飞,王军,白庆伟,鲍鑫宇,于文霞,麻永林.矩形波磁场对7A04铝合金凝固组织的细化研究[J].特种铸造及有色合金,2017,37(11):1254-1258.

Feng Yanfei, Wang Jun, Bai Qingwei, et al. Refinement of Solidification Structure of 7A04 Aluminum Alloy by Rectangular Wave Magnetic Field. [J]. Special Casting & Nonferrous Alloys 37(11):1254-1258(2017)
[1]冯艳飞,王军,白庆伟,鲍鑫宇,于文霞,麻永林.矩形波磁场对7A04铝合金凝固组织的细化研究[J].特种铸造及有色合金,2017,37(11):1254-1258. DOI： 10.15980/j.tzzz.2017.11.026.

Feng Yanfei, Wang Jun, Bai Qingwei, et al. Refinement of Solidification Structure of 7A04 Aluminum Alloy by Rectangular Wave Magnetic Field. [J]. Special Casting & Nonferrous Alloys 37(11):1254-1258(2017) DOI： 10.15980/j.tzzz.2017.11.026.

摘要

为了获得7A04铝合金在矩形波磁场下晶粒尺寸及凝固冷却曲线的变化规律

结合有限元数值模拟方法分析熔体内部磁感应强度、电磁力及磁能分布情况

研究了矩形波磁场特性对晶粒细化效果的影响。结果表明

在矩形波磁场作用下

7A04铝合金凝固组织得到不同程度的均匀细化。最佳矩形波磁场参数:频率为20Hz

峰值电流为100A

电流占空比为20%处理后

铸锭中心处、1/2半径处、边缘处晶粒平均尺寸分别为122.9、120.4、114.7μm

较未处理铸锭平均晶粒尺寸分别降低了24.3%、15.3%、22.6%。此时熔体内单周期产生电磁力密度最大值为7.01×104 N/m3

磁能密度为3 862.62J/m3

形成了良好的凝固条件。

Abstract

The variation of grain size and solidification cooling curve of 7 A04 aluminum alloy in the rectangular magnetic field was analyzed.The distribution of magnetic induction intensity

electromagnetic force and magnetic energy in the melt were analyzed by finite element method.Effect of the rectangular wave magnetic field on the grain refinement was expounded.The results reveal that the solidification structure of 7 A04 aluminum alloy can be refined to some extent by the rectangular wave magnetic field.With the optimized processing parameters

such as frequency of 20 Hz

peak current of 100 Aand current duty cycle of 20%

the average grain size in the ingot at the center and 1/2 radius as well as surface reach 122.9μm

120.4μm

114.7μm

respectively

which are decreased by 24.3%

15.3%

22.6%

respectively

compared with those of un-treated ones.In addition

the maximum density of electromagnetic force is 7.01×104 N/m3