Effect of Electromagnetic Stirring on the Solidification Behavior of High-Magnetic-Induction Grain-Oriented Silicon Stee
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https://doi.org/10.1007/s11837-020-04058-y Ó 2020 The Minerals, Metals & Materials Society
SOLIDIFICATION BEHAVIOR IN THE PRESENCE OF EXTERNAL FIELDS
Effect of Electromagnetic Stirring on the Solidification Behavior of High-Magnetic-Induction Grain-Oriented Silicon Steel Continuous Casting Slab XIN LI,1 XIANHUI WANG,2 YANPING BAO,1 JIAN GONG,2 WEIGUANG PANG,2 and MIN WANG1,3 1.—State Key Lab of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China. 2.—Silicon Steel Department, Shougang Qian’an Iron and Steel Company, Qian’an 064404, Hebei, China. 3.—e-mail: [email protected]
The solidification behaviors of high-magnetic-induction grain-oriented silicon steel slabs have been investigated during experiments in industrial strand electromagnetic stirring (S-EMS). The current intensities of S-EMS were 0, 120, 200, and 350 A, and the frequency was 5 Hz. The ratio of the equiaxed crystal was 14.95%, 15.64%, 45.22%, and 66.96%, respectively. Central porosity cannot be eliminated by increasing the current intensity. The number, size, and ratio of segregation spots were markedly reduced by minimizing the equiaxed crystal zone. Carbon in the 0 and 120 A slabs exhibited a lower degree of macrosegregation compared with the 200 and 350 A slabs. Controlling the cooling rate and increasing the total reduction are the directions to further improve solidification structures, defects, and carbon segregation.
INTRODUCTION High-magnetic-induction grain-oriented silicon steel is widely used in power generation and transmission fields.1–3 The final magnetic properties of grain-oriented silicon steel are determined by its chemical composition and structures.4 With an increase in power demand, the requirements for manufacturing grain-oriented silicon steel increase as well, particularly for controlling the chemical composition and homogeneity distribution of final structures. Continuous casting as the initial link of the long and complex heat treatment and rolling process affects the manufacturing process and final product properties directly. The solidification structures of continuous casting slab have a significant effect on the homogeneous distribution of chemical composition and the formation of highly aligned structures. Segregation behavior cannot be completely removed because of the redistribution of the residual solute enriched in the mushy zone during continuous casting. Segregation can be divided by scale into microsegregation, semi-macroscopic segregation, and macrosegregation,5–7 which are related to the morphology of the solidification structure. The serious segregation and central
cracks induced by the coarse structure appear in the center zone of the slab.8 Compared with the texture transformation process of coarse and fine structures of samples, the fine structures are easier to transform into Gaussian texture.9 Coarse structures need to be prevented during grain-oriented silicon steel industrial production. To control the morphology of the solidification structures and the redistributi
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