Solidification Structure of Continuous Casting Large Round Billets under Mold Electromagnetic Stirring

• Published in: Journal of iron and steel research, international Vol. 23; no. 4; pp. 329 - 337
• Main Authors: SUN, Tao, YUE, Feng, WU, Hua-jie, GUO, Chun, LI, Ying, MA, Zhong-cun
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.04.2016; Springer Singapore
• Subjects: Applied and Technical Physics; cellular-automaton-finite-element method; central equiaxed grain zone; continuous casting large round billet; Engineering; grain size; Machines; Manufacturing; Materials Engineering; Materials Science; Metallic Materials; Metallurgy and Metal Working; mold electromagnetic stirring; Physical Chemistry; ProCAST; Processes; solidification structure; 低过热度; 冷却强度; 凝固结构; 结晶器电磁搅拌; 耦合模型; 连铸圆坯; 铸造速度; central equiaxed grain zone; grain size; mold electromagnetic stirring; solidification structure; cellular-automaton-finite-element method; continuous casting large round billet
• ISSN: 1006-706X; 2210-3988
• DOI: 10.1016/S1006-706X(16)30053-X

The solidification structure of a continuous casting large round billet was analyzed by a cellular-automaton-finite-element coupling model using the ProCAST software. The actual and simulated solidification structures were compared under mold electromagnetic stirring (MEMS) conditions (current of 300 A and frequency of 3 Hz). Thereafter, the solidification structures of the large round billet were investigated under different superheats, casting speeds, and secondary cooling intensities. Finally, the effect of the MEMS current on the solidification structures was obtained under fixed superheat, casting speed, secondary cooling intensity, and MEMS frequency. The model accurately simulated the actual solidification structures of any steel, regardless of its size and the parameters used in the continuous casting process. The ratio of the central equiaxed grain zone was found to increase with decreasing superheat, increasing casting speed, decreasing secondary cooling intensity, and increasing MEMS current. The grain size obviously decreased with decreasing superheat and increasing MEMS current but was less sensitive to the casting speed and secondary cooling intensity.