电磁旋流水口连铸技术对小方坯凝固组织形貌和宏观偏析的影响

doi:10.11900/0412.1961.2018.00487

金属学报

2019, Vol. 55

Issue (7): 875-884 DOI: 10.11900/0412.1961.2018.00487

本期目录 | 过刊浏览

电磁旋流水口连铸技术对小方坯凝固组织形貌和宏观偏析的影响

吴春雷,李德伟,朱晓伟,王强(

)

1. 东北大学材料电磁过程研究教育部重点实验室沈阳 110819
2. 东北大学冶金学院沈阳 110819
3. 东北大学秦皇岛分校资源与材料学院秦皇岛 066004

Influence of Electromagnetic Swirling Flow in Nozzle on Solidification Structure and Macrosegregation of Continuous Casting Square Billet

Chunlei WU,Dewei LI,Xiaowei ZHU,Qiang WANG(

)

1. Key Laboratory of Electromagnetic Processing of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China
2. School of Metallurgy, Northeastern University, Shenyang 110819, China
3. School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao 066004, China

引用本文:

吴春雷,李德伟,朱晓伟,王强. 电磁旋流水口连铸技术对小方坯凝固组织形貌和宏观偏析的影响[J]. 金属学报, 2019, 55(7): 875-884.
Chunlei WU, Dewei LI, Xiaowei ZHU, Qiang WANG. Influence of Electromagnetic Swirling Flow in Nozzle on Solidification Structure and Macrosegregation of Continuous Casting Square Billet[J]. Acta Metall Sin, 2019, 55(7): 875-884.

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摘要:

在不同工业实验条件下，研究了电磁旋流水口技术对小方坯的凝固组织和C、S元素宏观偏析特征的影响规律，并与结晶器电磁搅拌所得结果相比较。结果表明，仅用电磁旋流水口技术，在电流频率为50 Hz时，随着电流强度由200 A升至600 A，等轴晶逐渐增多，而中心偏析严重程度先减轻后加重，在凝固组织以细小柱状晶为主时出现最优值。研究还表明，可以通过调整电磁旋流装置的电流参数来改变浸入式水口内钢水的旋流强度，进而获得不同凝固组织形貌和宏观偏析严重程度的铸坯。在本实验条件下，当装置的电流参数达到一定值后，电磁旋流水口技术在提高铸坯质量方面可以达到与结晶器电磁搅拌相同甚至更优的效果。

关键词 ：连铸, 凝固组织, 宏观偏析, 电磁旋流, 浸入式水口

Abstract：

During continuous casting production of square billet, the quality of steel billet is determined by equiaxed grain rate and defect grade of centerline segregation. The application of mold electromagnetic stirrer (M-EMS) can improve the quality, but it also brings some negative effects. Some researchers have attempted to make a swirling flow generated in submerged entry nozzle keep rotating in the mold to replace M-EMS. In this work, the influence of electromagnetic swirling flow in nozzle (EMSFN) on morphology of solidification structure and macrosegregation characteristics of carbon and sulfur was studied under different industrial test conditions, and the results were compared with those obtained by M-EMS. The results show that when the current frequency of EMSFN device is 50 Hz, with the current intensity increasing from 200 A to 600 A, the quantity of equiaxed grains increases gradually, while the severity of centerline segregation decreases first and then increases. The optimum value of centerline segregation was obtained when solidification structure was dominated by fine columnar crystals. Therefore, the swirling flow intensity of molten steel in submerged entry nozzle can be changed by adjusting the current parameters of EMSFN device, and thus the billets with different morphology of solidification structure and severity of macrosegregation can be obtained. Under the experimental condition, when the current parameters of EMSFN device reach certain values, EMSFN can achieve the same or even better effect as M-EMS in improving the quality of billet.

Key words： continuous casting solidification structure macrosegregation electromagnetic swirling flow submerged entry nozzle

收稿日期: 2018-10-30

ZTFLH:

TF777.1

基金资助:国家重点研发计划项目(No.2017YFB0304400);国家自然科学基金委员会-宝钢集团有限公司钢铁联合研究基金项目(No.U1560207);辽宁省高等学校创新团队支持计划项目(No.LT2017011)

作者简介: 吴春雷，男，1978年生，博士生

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https://www.ams.org.cn/CN/10.11900/0412.1961.2018.00487 或 https://www.ams.org.cn/CN/Y2019/V55/I7/875

图1 工业实验中EMSFN设备、M-EMS、SEN与结晶器的结构与尺寸示意图

表1 连铸工艺参数

表2 实验条件与试样编号

图2 试样的图像选取位置示意图及凝固组织形貌

图3 EMSFN不同电流强度条件下的等轴晶率

图4 不同实验条件下二次枝晶间距(SDAS)结果

图5 不同实验条件下从铸坯中心到边缘C元素和S元素的偏析系数

图6 不同实验条件下硫印检验结果

图7 硫印偏析斑点尺寸和分布位置

图8 硫印偏析斑点的分布比例区域划分方法示意图及不同实验条件下的分布比例结果

[1]	Flemings M C. Behavior of metal alloys in the semisolid state [J]. Metall. Mater. Trans., 1991, 22B: 269
[2]	Jiang D, Zhu M. Solidification structure and macrosegregation of billet continuous casting process with dual electromagnetic stirrings in mold and final stage of solidification: A numerical study [J]. Metall. Mater. Trans., 2016, 47B: 3446
[3]	Choudhary S K, Ganguly S. Morphology and segregation in continuously cast high carbon steel billets [J]. ISIJ Int., 2007, 47: 1759
[4]	Yu Y, Li B K. Calculation of electromagnetic force in electromagnetic stirring during continuous casting of steel [J]. Acta Metall. Sin., 2006, 42: 540
[4]	(于洋, 李宝宽. 钢连铸电磁搅拌工艺中电磁力的计算 [J]. 金属学报, 2006, 42: 540)
[5]	Zhang Z F, Li T J, Jin J Z. Thermal simulation on meniscus motion in the continuous casting with multi-electromagnetic field [J]. Acta Metall. Sin., 2001, 37: 975
[5]	(张志峰, 李廷举, 金俊泽. 复合电磁场作用下连铸金属液弯月面运动规律的热模拟研究 [J]. 金属学报, 2001, 37: 975)
[6]	Yokoya S, Takagi S, Iguchi M, et al. Swirling effect in immersion nozzle on flow and heat transport in billet continuous casting mold [J]. ISIJ Int., 1998, 38: 827
[7]	Spitzer K H, Dubke M, Schwerdtfeger K. Rotational electromagnetic stirring in continuous casting of round strands [J]. Metall. Mater. Trans., 1986, 17B: 119
[8]	Steinbach S, Ratke L. The effect of rotating magnetic fields on the microstructure of directionally solidified Al-Si-Mg alloys [J]. Mater. Sci. Eng., 2005, A413-414: 200
[9]	Yokoya S, Asako Y, Hara S, et al. Control of immersion nozzle outlet flow pattern through the use of swirling flow in continuous casting [J]. ISIJ Int., 1994, 34: 883
[10]	Kholmatov S, Takagi S, Jonsson L T I, et al. Development of flow field and temperature distribution during changing divergent angle of the nozzle when using swirl flow in a square continuous casting billet mould [J]. ISIJ Int., 2007, 47: 80
[11]	Tsukaguchi Y, Hayashi H, Kurimoto H, et al. Development of swirling-flow submerged entry nozzles for slab casting [J]. ISIJ Int., 2010, 50: 721
[12]	Jia H H, Yu Z, Lei Z S, et al. Water modelling on the effect of swirling flow nozzle on flow field in continuous casting mold of billet [J]. Acta Metall. Sin., 2008, 44: 375
[12]	(贾洪海, 于湛, 雷作胜等. 旋流水口对小方坯连铸结晶器流场影响的水模拟 [J]. 金属学报, 2008, 44: 375)
[13]	Yu Z, Lei Z S, Jia H H, et al. Numerical simulation of flow field using swirling flow nozzle in continuous casting billet mould [J]. J. Iron Steel Res. Int., 2008, 15: 554
[14]	Sun H B, Zhang J Q. Macrosegregation improvement by swirling flow nozzle for bloom continuous castings [J]. Metall. Mater. Trans., 2014, 45B: 936
[15]	Ni P Y, Jonsson L T I, Ersson M, et al. A new tundish design to produce a swirling flow in the SEN during continuous casting of steel [J]. Steel Res. Int., 2016, 87: 1356
[16]	Ni P Y, Wang D X, Jonsson L T I, et al. Numerical and physical study on a cylindrical tundish design to produce a swirling flow in the SEN during continuous casting of steel [J]. Metall. Mater. Trans., 2017, 48B: 2695
[17]	He J C, Marukawa O, Su Z J. Electromagnetic eddy flow downspout [P]. Chin Pat, CN1768984A, 2006
[17]	(赫冀成, 丸川雄净, 苏志坚. 电磁旋流水口 [P]. 中国专利, CN1768984A, 2006)
[18]	Wang Q, He M, Zhu X W, et al. Study and development on numerical simulation for application of electromagnetic field technology in metallurgical processes [J]. Acta Metall. Sin., 2018, 54: 228
[18]	(王强, 何明, 朱晓伟等. 电磁场技术在冶金领域应用的数值模拟研究进展 [J]. 金属学报, 2018, 54: 228)
[19]	Li D W, Su Z J, Chen J, et al. Effects of electromagnetic swirling flow in submerged entry nozzle on square billet continuous casting of steel process [J]. ISIJ Int., 2013, 53: 1187
[20]	Li D W, Su Z J, Chen J, et al. Numerical simulation of swirling flow in divergent submerged entry nozzle in round billet continuous casting of steel [J]. Acta Metall. Sin., 2013, 49: 871
[20]	(李德伟, 苏志坚, 陈进等. 钢圆坯连铸过程中渐开式电磁旋流水口数值模拟 [J]. 金属学报, 2013, 49: 871)
[21]	Li D W, Su Z J, Marukawa K, et al. Simulation on effect of divergent angle of submerged entry nozzle on flow and temperature fields in round billet mold in electromagnetic swirling continuous casting process [J]. J. Iron Steel Res. Int., 2014, 21: 159
[22]	Li D W, Su Z J, Sun L W, et al. Development of electromagnetic swirling flow in immersion nozzle in continuous casting process of steel [J]. Adv. Mater. Res., 2011, 295-297: 1284
[23]	Geng D Q, Lei H, He J C, et al. Effect of electromagnetic swirling flow in slide-gate SEN on flow field in square billet continuous casting mold [J]. Acta Metall. Sin. (Engl. Lett.), 2012, 25: 347
[24]	Wondrak T, Eckert S, Galindo V, et al. Liquid metal experiments with swirling flow submerged entry nozzle [J]. Ironmaking Steelmaking, 2012, 39: 1
[25]	Ohno A. Grain growth control by solidification technology [J]. Mater. Sci. Forum, 1996, 204-206: 169
[26]	Ren B Z, Chen D F, Wang H D, et al. Numerical analysis of coupled turbulent flow and macroscopic solidification in a round bloom continuous casting mold with electromagnetic stirring [J]. Steel Res. Int., 2015, 86: 1104
[27]	Griffiths W D, McCartney D G. The effect of electromagnetic stirring during solidification on the structure of Al-Si alloys [J]. Mater. Sci. Eng., 1996, A216: 47
[28]	Xu Y, Xu X J, Li Z, et al. Dendrite growth characteristics and segregation control of bearing steel billet with rotational electromagnetic stirring [J]. High Temp. Mater. Proc., 2007, 36: 339
[29]	Hu H Q, Zheng R Q. Influence of electromagnetic stirring on dendritic structure and mechanical properties of low sulphur steel [J]. Acta Metall. Sin., 1990, 26: A313
[29]	(胡汉起, 郑日琪. 电磁搅拌对低硫钢枝晶组织及机械性能的影响 [J]. 金属学报, 1990, 26: A313)
[30]	Wu H J, Wei N, Bao Y P, et al. Effect of M-EMS on the solidification structure of a steel billet [J]. Int. J. Miner. Metall. Mater., 2011, 18(2): 159
[31]	Ji Y, Lan P, Geng H, et al. Behavior of spot segregation in continuously cast blooms and the resulting segregated band in oil pipe steels [J]. Steel Res. Int., 2018, 89: 1700331
[32]	Eckert S, Nikrityuk P A, Willers B, et al. Electromagnetic melt flow control during solidification of metallic alloys [J]. Eur. Phys. J. Spec. Top., 2013, 220: 123
[33]	Hurtuk D J, Tzavaras A A. Some effects of electromagnetically induced fluid flow on macrosegregation in continuously cast steel [J]. Metall. Mater. Trans., 1977, 8B: 243

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