第 卷第 期 中国有色金属学报 年 月18 6 2008 6
Vol.18 No.6 The Chinese Journal of Nonferrous Metals Jun. 2008
文章编号:1004-0609(2008)06-1058-06
电磁场作用下铜板带水平连铸熔体的流动和凝固特征
李伟轩
1
,于 湛
1
,邓 康
1
,雷作胜
1
,程镇康
2
,任忠鸣
1
(1. 上海大学 现代冶金与材料制备重点实验室,上海 200072;
2. 兴业电子铜带有限公司,慈溪 315336)
摘 要:为了消除铜板带水平连铸中的微气孔、夹杂和柱状晶对接等凝固问题,提出一种基于正交磁场和直流电
流相互作用的结晶器内水平电磁搅拌,并在实验室物理模拟实验的基础上,进行现场工业实验。在模拟实验中,
用超声波多普勒测速仪测量该电磁搅拌下水平连铸结晶器内金属液的流动规律,并与生产实验中锌白铜板带的凝
固特征相互印证,发现搅拌电流达到 400 A 时,板带内部气孔消失,电流达到 500 A 时板带出现等轴晶带,电流
达到 800 A 时板带坯偏析率趋于零。
关键词:铜熔体;水平连铸;电磁搅拌;流动;凝固
中图分类号:TG 249.7; TG 146.1 文献标识码:A
Flow and solidification characteristics of melt under electromagnetic
stirring in horizontal continuous casting of copper thin-slab
LI Wei-xuan
1
, YU Zhan
1
, DENG Kang
1
, LEI Zuo-sheng
1
, CHENG Zhen-kang
2
, REN Zhong-ming
1
(1. School of Materials, Shanghai University, Shanghai 200072, China;
2. Sunshine Electronic Copper-tape Ltd. Co., Cixi 315336, China)
Abstract: A new horizontal electromagnetic stirring method in mold based on the orthogonal interaction between static
magnetic field and DC current was put forward to overcome the solidification disadvantages such as micro pore,
inclusion and columnar crystals joint in copper thin-slab’s horizontal continuous casting. Commercial production was
experimented based on the physical simulation in laboratory. In the simulation, the flow rule of melt metal in mold of
horizontal continuous casting with electromagnetic stirring is measured using ultrasonic Doppler velometer, and the result
is inter confirmed with the solidification characteristics is tics of zinc cupronickel thin slab in industrial product, some
advantageous results are obtained that, when the current is 400 A the inner micro-pores disappear, when the current is
500 A the center equiaxed crystal layers occur and when the current is to 800 A the inner-segregation decreases to zero.
Key words: copper melt; horizontal continuous casting; electromagnetic stirring; flow; solidification
薄板带坯水平连铸是生产有色金属板带材的重要
工艺。由于其铸造过程中温度梯度大,冷却速度快,
使板带坯在凝固中易产生偏析、中心疏松、夹杂、微
气孔等缺陷, 这些凝固缺陷往往在后续冷加工中才得
以暴露,且难以去除,严重影响产品质量或造成直接
报废。研究表明,连铸结晶器内金属液的流动对铸坯
的质量有重要影响
[1−9]
,而在外部电磁场的作用下,结
晶器内的金属熔体受其驱动,其流态和流速可按照人
们所设想方向和范围进行调节,因此影响和改善铸坯
的凝固行为,可获得高质量的铸坯
[10−11]
。对此,本文
作者针对铜板带水平连铸的上述凝固缺陷问题,利用
外加电磁作用驱动结晶器内铜液的定向流动并期望改
基金项目:国家高技术研究发展计划资助项目(2002AA3Z1410)
收稿日期:2007-10-12;修订日期:2008-03-18
通讯作者:邓康,教授;电话:021-56331102;E-mail: dengk2000@163.com