| RESEARCH PAPER |
|
|
|
|
|
| Fabrication of AA1070/AA7050 Multi-alloy Ingots by Movable Sprue Planar Solidification Casting Process |
| SHAO Bo, KONG Xiangzhong, HAN Xing, ZHANG Yulei, QIN ke, ZHANG Haitao, CUI Jianzhong
|
| Key Laboratory of Electromagnetic Processing of Materials of Ministry of Education, Northeastern University, Shenyang 110819 |
|
|
|
|
Abstract An innovative feeding system was proposed for the planar solidification casting to prepare large-sized multi-alloy ingots. The commercial software FLUENT was used to simulate the effect of the sprue distributions on the temperature field during the casting process. The numerical results revealed that the movable sprues can achieve a melt temperature uniformity significantly superior to the immovable sprues, thereby enabling the ascending solid/liquid interface to remain level during solidification preoess. The AA1070/AA7050 multi-layer ingot was fabricated by using movable sprue planar solidification casting method. The casting results showed that the interface of the composite ingot was clear and level, and metallurgical bonding was achieved with an elemental diffusion layer. The metallographic structure of 7050 part was uniform and there was no obvious macrosegregation along the vertical direction.
|
|
Published: 25 December 2017
Online: 2018-05-08
|
|
|
|
|
1 Eskin D G. Physical metallurgy of direct chill casting of aluminum alloys[M]. New York:CRC press, 2008:1.
2 Grandfield J, Eskin D G, Bainbridge I. Direct-chill casting of light alloys: Science and technology[M].John Wiley & Sons, 2013:1.
3 Haghayeghi R, Zoqui E J, Green N R, et al. An investigation on DC casting of a wrought aluminium alloy at below liquidus temperature by using melt conditioner[J]. J Alloys Compd, 2010,502(2):382.
4 M’hamdi M, Mo A. On modelling the interplay between microporosity formation and hot tearing in aluminium direct-chill casting[J]. Mater Sci Eng A,2005,413-414:105.
5 Lalpoor M, Eskin D G, Ruvalcaba D, et al. Cold cracking in DC-cast high strength aluminum alloy ingots: An intrinsic problem intensified by casting process parameters[J]. Mater Sci Eng A,2011,528(6): 2831.
6 Eskin D G, Zuidema J, Savran V I, et al. Structure formation and macrosegregation under different process conditions during DC casting[J]. Mater Sci Eng A,2004,384(1-2):232.
7 Eskin D G, Du Q, Katgerman L. Relationship between shrinkage-induced macrosegregation and the sump profile upon direct-chill casting[J]. Scripta Mater, 2006,55(8):715.
8 Chen D X, Li X Q, Li Z H, et al. Microstructure and macro-segregation law of ultrasonic cast 7050 aluminum alloy ingots[J]. J University of Science Technology Beijing, 2012,34(6):666(in Chinese).
陈鼎欣, 李晓谦, 黎正华, 等. 超声铸造7050铝合金的微观组织和宏观偏析规律[J]. 北京科技大学学报, 2012,34(6):666.
9 Zuo Y B, Zhao Z H, Zhu Q F, et al. Mechanism of grain refinement of aluminum alloy achieved by low frequency electromagnetic casting process[J]. Chin J Nonferr Met, 2013(1):51(in Chinese).
左玉波, 赵志浩, 朱庆丰, 等. 低频电磁铸造细化铝合金组织的机理[J]. 中国有色金属学报, 2013(1):51.
10Zhao Z H, Cui J Z, Zuo Y B, et al. Distribution of magnetic field and its effects on macrosegregation of electromagnetic HDC casting aluminum alloy[J]. Foundry, 2005,54(3):241(in Chinese).
赵志浩, 崔建忠, 左玉波, 等. 低频电磁水平半连续铸造中磁场的分布及其对宏观偏析的影响[J]. 铸造, 2005,54(3):241.
11Wang H F. Study on air knife direct chill casting of high strength aluminum alloys[D]. Shenyang: Northeastern University, 2012(in Chinese).
王海峰. 高强铝合金气刀半连续铸造研究[D]. 沈阳: 东北大学, 2012.
12Chu M G, et al. Aluminum monolithic alloy and multi-alloy cast using planar solidification approach[C]∥13th International Conference on Aluminum Alloys. Pennsylvania, 2012:1367.
|
|
|
|
渝公网安备50019002502923号 © Editorial Office of Materials Reports.
2017, Vol. 31 
