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金属学报  2018, Vol. 54 Issue (3): 435-442    DOI: 10.11900/0412.1961.2017.00251
  本期目录 | 过刊浏览 |
坩埚尺寸和电磁频率对半固态A356铝合金浆料流动的影响
刘政1(), 陈志平1, 陈涛2
1 江西理工大学机电工程学院 赣州 341000
2 江西理工大学材料科学与工程学院 赣州 341000
Effects of Crucible Size and Electromagnetic Frequency on Flow During Fabrication of Semisolid A356 Al Alloy Slurry
Zheng LIU1(), Zhiping CHEN1, Tao CHEN2
1 School of Mechanical and Electronic Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
2 School of Materials Science and Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China
全文: PDF(3278 KB)   HTML
摘要: 

采用数值模拟方法,通过改变坩埚长短轴比例R和电磁搅拌频率研究半固态A356铝合金浆料的流动规律,以及R对半固态A356铝合金浆料初生相组织的影响。结果表明:随着R增大,半固态A356铝合金在短轴上所受的最大电磁力和最大流速呈先增大后减小的趋势,在长轴上所受的最大电磁力和最大流速呈先增大后减小再增大的现象;频率越高,短轴和长轴上所受的电磁力差和流速差越明显,因而可使熔体流动时出现“加速-减速-加速”的循环运动现象。当电磁频率和R分别为30 Hz和1.1时,坩埚长轴和短轴上的最大流速分别为153.6和143.2 mm/s,流速差最小,此时可制备出较优的半固态A356铝合金浆料。

关键词 半固态铝合金坩埚尺寸电磁频率流速数值模拟    
Abstract

A356 aluminum alloy has been widely used in semisolid processing because of its wide range of liquidus and solidus temperatures. The flow of the melt during solidification has a certain influence on the composition, solute distribution, phase morphology and crystal defects of the alloy in the solidification structure. The flow of melt is an important factor that influences the overall performance of the solidification process. The researchers use various external fields to act on the melt to induce the melt flow. Electromagnetic stirring has the characteristics of no contact, no pollution, light oxidation, less gas content and easy to control stirring parameters. It is the most popular method to fabricate semisolid alloy slurry. The electromagnetic force of the electromagnetic field can be used to study the flow phenomena of the melt. Numerical simulation combined with experimental research can get better results. The effects of crucible size and electromagnetic frequency on flow during fabrication of semisolid A356 aluminum alloy slurry under electromagnetic stirring through numerical simulation as well as the influence of crucible size on the primary phase of semisolid A356 aluminum alloy slurry induced by electromagnetic field were investigated. The results show that with the increasing of the major and minor axial ratio of crucible (R), the maximum electromagnetic force and maximum flow rate of the semisolid A356 aluminum alloy at the minor axis firstly increase and then decrease, and the maximum electromagnetic force and maximum flow rate of the semisolid A356 aluminum alloy at the major axis increase first, then decrease and then increase. The higher the electromagnetic frequency, the electromagnetic force difference and the flow rate difference of the semisolid A356 aluminum alloy at the minor axis and the major axis are apparent, so that occurs the phenomenon of "acceleration-deceleration-acceleration" in the melt flow. When the electromagnetic frequency and R are 30 Hz and 1.1 respectively, the maximum flow rate at the major axis and the minor axis of the crucible are 153.6 and 143.2 mm/s respectively, and the flow rate difference is the smallest, better semisolid A356 aluminum alloy slurry can be fabricated at this condition.

Key wordssemisolid aluminum alloy    crucible size    electromagnetic frequency    flow rate    numerical simulation
收稿日期: 2017-06-26     
基金资助:资助项目 国家自然科学基金项目Nos.51144009和51361012,江西省自然科学基金项目No.20142bab206012以及江西省教育厅科技项目No.GJJ14407
作者简介:

作者简介 刘 政,男,1958年生,教授,博士

引用本文:

刘政, 陈志平, 陈涛. 坩埚尺寸和电磁频率对半固态A356铝合金浆料流动的影响[J]. 金属学报, 2018, 54(3): 435-442.
Zheng LIU, Zhiping CHEN, Tao CHEN. Effects of Crucible Size and Electromagnetic Frequency on Flow During Fabrication of Semisolid A356 Al Alloy Slurry. Acta Metall Sin, 2018, 54(3): 435-442.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2017.00251      或      https://www.ams.org.cn/CN/Y2018/V54/I3/435

图1  不同坩埚长短轴比例R下的模型和网格划分
图2  计算流程示意图
图3  不同R和电磁频率下的最大电磁力
R 10 Hz 20 Hz 30 Hz 40 Hz
1.0 638.1 760.9 802.0 820.3
1.1 685.0 817.6 849.9 856.3
1.2 682.6 866.1 931.8 962.7
1.3 1928.8 2398.3 2580.6 2673.9
表1  不同R和电磁频率下长短轴上的电磁力差
图4  不同R和电磁频率下的最大流速
R 10 Hz 20 Hz 30 Hz 40 Hz
1.0 22.4 22.5 22.7 22.6
1.1 8.8 9.9 10.3 10.6
1.2 18.6 21.3 22.1 22.4
1.3 39.2 41.7 41.7 41.4
表2  不同R和电磁频率下长短轴上的流速差
图5  不同R下半固态A356合金初生相形貌的OM像
图6  不同R下半固态A356合金的初生相的平均等积圆直径D和平均形状因子F
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