Transactions of Materials and Heat Treatment

Title：Effect of mold electromagnetic stirring on dendrite generation in 20CrMnTiH steel square billet

Authors： Yue Feng1 Liu Jiawei2 Wu Shuai3 Wei Xiaohui1

Unit： 1. Collaborative Innovation Center of Steel Technology University of Science and Technology Beijing 2.China Academy of Machinery Beijing Research Institute of Mechanical & Electrical Technology Co. Ltd. 3.MCC Huatian Nanjing Engineering & Technology Corporation

KeyWords： 20CrMnTiH steel mold electromagnetic stirring current intensity primary dendrite secondary dendrite

ClassificationCode：TF777.2

year,vol(issue):pagenumber：2025,50(3):70-76

Abstract：

For a 160 mm×160 mm square billet of 20CrMnTiH from a domestic steel mill, the effect of current intensity for mold electromagnetic stirring (M-EMS) on the dendrite generation was studied. The results demonstrate that the increase in secondary dendrite spacing (SDAS) is proportional to the distance of dendrites from the billet surface. In the absence of mold electromagnetic stirring, the SDAS is 23 μm at a distance of 2 mm from the billet surface, and increased to 75 μm at a distance of 26 mm from the square billet surface. Using M-EMS will increase the SDAS, and the SDAS increases with the increasing of the current intensity for M-EMS. When the current intensity of M-EMS increases from 150 A to 320 A, the average SDAS increases from 50.8 μm to 54.9 μm. M-EMS will cause the secondary dendrites at 8 mm from the square billet surface to break. As the stirring intensity increases, the number of broken secondary dendrites will increase. M-EMS causes the primary dendrites in the columnar grain zone of the square billet to grow obliquely in the same direction, and the inclination angle of the primary dendrites increases with the increasing of the current intensity for M-EMS. The flow velocity of the molten steel at the solidification front can be estimated through the inclination angle of the primary dendrites. When the M-EMS current intensity is 150 A, the inclination angle of the primary dendrites is 23.2° and the flow velocity of the molten steel is 0.146 m·s-1. When the current intensity is 320 A, the inclination angle of the primary dendrites is 27.8° and the flow velocity of the molten steel is 0.358 m·s-1.

Funds：

作者简介：岳峰（1969-），男，博士，高级工程师 E-mail：yuefeng@nercar.ustb.edu.cn 通信作者：刘佳伟（1990-），男，博士，助理工程师 E-mail：liu_jiawei163@163.com

Reference：

[1]He X F, Wang M Q, Hu C F, et al. Study of the relationship among total oxygen, inclusions and fatigue properties of gear steel[J]. Materials Science & Engineering： A, 2021, 827: 141999.

[2]郭永. 齿轮钢42CrMo连铸小方坯凝固组织研究[D]. 沈阳: 东北大学, 2019.

Guo Y. Study on Solidification Organization of Continuous Casting Billet of Gear Steel 42CrMo [D]. Shenyang: Northeastern University, 2019.

[3]Wu Z H, Li Z X, Zhang Q Y, et al. Effect of microstructure on wear resistance during high temperature carburization heat treatment of heavyduty gear steel[J]. Materials Today Communications, 2024, 40: 109486.

[4]李伟, 李阳, 程常桂, 等. 钢种初始凝固模式对连铸坯表面质量的影响[J].钢铁研究学报, 2023, 35(7): 819-831.

Li W, Li Y, Cheng C G, et al. Influence of initial solidification mode of steel grades on surface quality of continuous casting billets[J]. Journal of Iron and Steel Research, 2023, 35(7): 819-831.

[5]李解, 张鲲, 李强, 等. HRB400热轧带肋钢筋铸坯质量缺陷原因分析及优化[J]. 连铸, 2023 (1):55-60.

Li X, Zhang K, Li Q, et al. Analysis and optimization of quality defects of HRB400 hot rolled ribbed steel billets[J]. Continuous Casting,2023(1):55-60.

[6]林鹏, 李立刚, 张龙, 等. 结晶器圆角对160 mm×160 mm连铸坯轧制质量的影响[J]. 锻压技术, 2024, 49(9):99-107.

Lin P, Li L G, Zhang L, et al .Influence of crystallizer fillet on rolling quality of 160 mm×160 mm continuouscasting billets[J]. Forging & Stamping Technology, 2024, 49(9):99-107.

[7]Li J L, Nian Y, Liu X, et al. Application of electromagnetic metallurgy in continuous casting: A review[J]. Progress in Natural Science: Materials International, 2024, 34: 1-11.

[8]刘泽峰, 周禹, 曹学欠, 等. 结晶器电磁搅拌对五孔水口大方坯连铸过程的影响[J/OL]. 钢铁, 1-16[2025-03-12]. https://doiorg/1013228/jboyuanissn0449-749x20240579.

Liu Z F, Zhou Y, Cao X Q, et al. Influence of mold electromagnetic stirring on the continuous casting process of large billet with five holes[J/OL]. Iron &Steel, 1-16[2025-03-12]. https://doiorg/1013228/jboyuanissn0449-749x20240579.

[9]丰琦, 郑鑫钰, 杨建, 等. 42CrMoA钢凝固组织数值模拟[J]. 连铸, 2024 (6):45-51.

Feng Q, Zheng X Y, Yang J, et al. Numerical simulation of solidification organization of 42CrMoA steel[J]. Continuous Casting, 2024 (6):45-51.

[10]陈亮, 汤群伟, 王璞, 等. MEMS对45钢矩形坯铸态组织和溶质分布均匀性的影响[J]. 连铸, 2024 (2): 45-49.

Chen L, Tang Q W, Wang P, et al. Effect of MEMS on the uniformity of casting organization and solute distribution of 45 steel rectangular billet[J]. Continuous Casting, 2024 (2): 45-49.

[11]贺睿哲, 张朝晖, 吕明, 等. Φ350 mm圆坯结晶器内钢液流动-传热行为规律[J]. 连铸, 2024 (5): 39-45.

He R Z, Zhang Z H, Lyu M, et al. Behavior of liquid steel flow and heat transfer in Φ350 mm round billet crystallizer[J]. Continuous Casting, 2024 (5): 39-45.

[12]李红光, 徐明丽, 黎建全, 等. 连铸关键工艺对200 mm×200 mm断面SWRH82B铸坯均质性的影响[J].连铸, 2024 (5):90-97.

Li H G, Xu M L, Li J Q, et al. Influence of the key process of continuous casting on the homogeneity of SWRH82B cast billet with 200 mm×200 mm section[J]. Continuous Casting, 2024 (5):90-97.

[13]张军卫, 代芳音, 孙明玮, 等. 180 mm×240 mm矩形坯结晶器电磁搅拌参数优化研究[J]. 甘肃冶金, 2024, 46(2): 75-78.

Zhang J W, Dai F Y, Sun M W, et al. Optimization of mold electromagnetic stirring parameters for 180 mm×240 mm rectangular billet crystallizer[J]. Gansu Metallurgy, 2024, 46(2): 75-78.

[14]周伟基, 姚玉东, 刘佳伟, 等. 结晶器电磁搅拌对Q355NE Φ800 mm圆坯凝固组织及偏析的影响[J]. 特殊钢, 2023, 44(3): 64-68.

Zhou W J, Yao Y D, Liu J W, et al. Effect of mold electromagnetic stirring on solidification organization and segregation of Q355NE Φ800 mm round billet[J]. Special Steel, 2023, 44(3): 64-68.

[15]胡松松, 何铭, 罗烽月, 等. 定向凝固晶粒竞争生长研究进展[J/OL]. 钢铁, 1-15[2025-03-12]. https://doiorg/1013228/jboyuanissn0449-749x20240660.

Hu S S, He M, Luo F Y, et al. Progress of competitive grain growth in directional solidification[J/OL]. Steel, 1-15[2025-03-12]. https://doiorg/1013228/jboyuanissn0449-749x 20240660.

[16]王肸杰. 电渣重熔H13钢枝晶偏析和一次碳化物的控制与改善[D]. 武汉：武汉科技大学, 2022.

Wang X J. Control and Improvement of Dendritic Segregation and Primary Carbides in Electroslag Remelting H13 Steel [D]. Wuhan: Wuhan University of Science and Technology, 2022.

[17]高桥忠义, 王庆奎. 钢锭的凝固与偏析[J]. 钢铁, 1982 (3): 60-64.

Tadayoshi T, Wang Q K. Solidification and segregation of steel ingots[J]. Iron and Steel, 1982 (3): 60-64.

Service：

【This site has not yet opened Download Service】【Add Favorite】