二冷区电磁搅拌换向周期对薄板坯中心等轴晶率的影响

doi:10.13228/j.boyuan.issn1005-4006.20230039

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Abstract Increasing the equiaxed crystal ratio (ECR) is essential for the solidification quality of thin steel slabs during the high-speed continuous casting process. A three-phase solidification model was adapted to numerically predict the flow mode and ECR of a three-dimensional full-size thin slab continuous casting process. The effect of the switching period of strand electromagnetic stirring (SEMS) on ECR was analyzed. The results showed that the molten steel solidified rapidly in the funnel-shaped mold, and the solidification rate at the mold outlet reached 37%. Two recirculation zones formed in the molten pool when the electromagnetic stirring direction was fixed, which were separated by superheated molten steel. The liquid steel in the core of the upper recirculation was in a supercooled state. The flow pattern in the secondary cooling zone was composed of four or even five vortices after the stirring direction changed. ECR increased first and then decreased with the switching period of SEMS. ECR increased most significantly when the switching period was 16 s, which was increased by 17% compared with that of fixed stirring. And the distribution of the equiaxed phase became more uniform.

Key words： thin slab continuous casting solidification equiaxed crystal ratio electromagnetic stirring switching period

Received: 18 May 2023

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	Articles by authors
	WANG Changjun
	LIU Zhongqiu
	LI Baokuan

Cite this article:

WANG Changjun,LIU Zhongqiu,LI Baokuan. Effect of switching period of SEMS on central equiaxed crystal ratio of thin steel slabs[J]. CONTINUOUS CASTING, 2023, 42(5): 64-70.

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http://www.chinamet.cn/Jweb_lz/EN/10.13228/j.boyuan.issn1005-4006.20230039 OR http://www.chinamet.cn/Jweb_lz/EN/Y2023/V42/I5/64

[1]	王国栋, 吴迪, 刘振宇, 等. 中国轧钢技术的发展现状和展望[J]. 中国冶金, 2009, 19(12): 1.
[2]	王国栋. 近年我国轧制技术的发展、现状和前景[J]. 轧钢, 2017, 34(1): 1.
[3]	毛新平, 高吉祥, 柴毅忠. 中国薄板坯连铸连轧技术的发展[J]. 钢铁, 2014, 49(7): 49.
[4]	仇圣桃, 项利, 岳尔斌, 等. 薄板坯连铸连轧流程生产取向硅钢技术分析[J]. 钢铁, 2008, 43(9): 1.
[5]	郑艳, 梁娜, 刘兆武, 等. 连铸坯凝固组织的数值模拟[J]. 连铸, 2012(3): 8.
[6]	孙涛, 岳峰, 郭春, 等. 连铸工艺参数对大圆坯凝固组织影响的数学模拟[J]. 炼钢, 2015, 31(6): 23.
[7]	常锷, 王立江. 铁素体不锈钢凝固组织的影响因素[J]. 钢铁, 2012, 47(8): 27.
[8]	WANG Q, HE M, ZHU X, et al. Study and development on numerical simulation for application of electromagnetic field technology in metallurgical processes[J]. Acta Metallurgica Sinica, 2018, 54(2): 228.
[9]	杨海峰, 汪渊源, 李廷刚, 等. 电磁搅拌对Q345D连铸坯凝固组织的影响[J]. 连铸, 2018(5): 54.
[10]	孔为, 陈迎锋, 苍大强. 高硅电工钢连铸二冷电磁搅拌应用研究[J]. 铸造技术, 2018, 39(11): 2566.
[11]	李强, 张凯, 沈长华. 辊式电磁搅拌器在包钢电工钢上的应用[J]. 连铸, 2020(2): 68.
[12]	李辉成, 杨谱, 刘海宁, 等. PMO-EMS组合调控提高铸坯均质化应用实践[J]. 连铸, 2022(4): 66.
[13]	JIANG D B, WANG W L, LUO S, et al. Mechanism of macrosegregation formation in continuous casting slab: A numerical simulation study[J]. Metallurgical and Materials Transactions B, 2017, 48(6): 3120.
[14]	JIANG D B, ZHU M Y. Solidification structure and macrosegregation of billet continuous casting process with dual electromagnetic stirrings in mold and final stage of solidification: A numerical study[J]. Metallurgical and Materials Transactions B, 2016, 47(6): 3446.
[15]	GUAN R, JI C, ZHU M Y, et al. Numerical simulation of V-shaped segregation in continuous casting blooms based on a microsegregation model[J]. Metallurgical and Materials Transactions B, 2018, 49(5): 2571.
[16]	张宏丽, 王恩刚, 贾光霖, 等. 电磁搅拌提高铸坯等轴晶比率的数值模拟[J]. 东北大学学报, 2001, 22(5): 535.
[17]	李日, 周黎明, 潘红, 等. 基于体积平均法的NH4Cl水溶液凝固行为研究[J]. 工程科学学报, 2015, 37(8): 1008.
[18]	LIU Z Q, NIU R, WU Y D, et al. Physical and numerical simulation of mixed columnar-equiaxed solidification during cold strip feeding in continuous casting[J]. International Journal of Heat and Mass Transfer, 2021, 173: 121237.
[19]	刘中秋, 李宝宽, 肖丽俊, 等. 连铸结晶器内高温熔体多相流模型化研究进展[J]. 金属学报, 2022, 58(10): 1236.
[20]	ZHANG Z, WU M H, ZHANG H J, et al. Modeling of the as-cast structure and macrosegregation in the continuous casting of a steel billet: Effect of M-EMS[J]. Journal of Materials Processing Technology, 2022, 301: 117434.
[21]	刘成明, 王锦程, 李俊杰. 体积平均法在凝固传输过程模拟中的应用[J]. 铸造, 2013, 62(9): 855.
[22]	GUAN R, JI C, WU CH, et al. Numerical modelling of fluid flow and macrosegregation in a continuous casting slab with asymmetrical bulging and mechanical reduction[J]. International Journal of Heat and Mass Transfer, 2019, 141: 503.
[23]	WANG C, LIU Z, LI B, et al. An improved columnar solidification model coupled with anisotropic mush permeability[J]. Metallurgical and Materials Transactions B, 2023, 54: 1275.
[24]	WANG C J, LIU Z Q, LI B K. A three-phase volume-averaged solidification model considering the growth direction of columnar crystal axis[J]. International Journal of Heat and Mass Transfer, 2022, 194: 122974.
[25]	LIPTON J, GLICKSMAN M E, KURZ W. Dendritic growth into undercooled alloy metals[J]. Materials Science and Engineering, 1984, 65(1): 57.
[26]	WANG C J, LIU Z Q, LI B K. Combined effects of EMBr and SEMS on melt flow and solidification in a thin slab continuous caster[J]. Metals, 2021, 11(6): 948.
[27]	李宝宽, 刘中秋, 齐凤升, 等. 薄板坯连铸结晶器非稳态湍流大涡模拟研究[J]. 金属学报, 2012, 48(1): 23.
[28]	LIU Z, LI B, TSUKIHASHI F. Instability and periodicity of asymmetrical flow in a funnel thin slab continuous casting mold[J]. ISIJ International, 2015, 55(4): 805.
[29]	PETRUS B, ZHENG K, ZHOU X, et al. Real-time, model-based spray-cooling control system for steel continuous casting[J]. Metallurgical and Materials Transactions B, 2011, 42(1): 87.
[30]	CAMPORREDONDO S J E, CASTILLEJOS E A H, ACOSTA G F A, et al. Analysis of thin-slab casting by the compact-strip process: Part I. Heat extraction and solidification[J]. Metallurgical and Materials Transactions B, 2004, 35(3): 541.