Effect of M-EMS on the solidification structure of a steel billet

• Published in: 矿物冶金与材料学报 Vol. 18; no. 2; pp. 159 - 164
• Main Authors: Hua-jie Wu, Ning Wei, Yan-ping Bao, Guo-xin Wang, Chao-ping Xiao, Jin-jin Liu
• Format: Journal Article
• Language: English
• Published: Engineering Research Institute, University of Science and Technology Beijing Beijing100083, China%School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing100083, China 01.04.2011
• Subjects: cooling rate; electromagnetic stirring; continuous casting; solidification; dendrite arm spacing
• ISSN: 1674-4799
• DOI: 10.1007/s12613-201-0416-3

TG260; Effects of mold electromagnetic stirring (M-EMS) on the solidification structure of 45# steel billet were investigated by examination of interdendritic corrosion The results show that the primary and secondary dendrite arm spacings increase from the edge of the billet to the center and decrease obviously with increasing electromagnetic torque, which will be beneficial to refine the solidification structure and enlarge the equiaxed crystal zone. The ratio of equiaxed crystal increases by 15.9% with the electromagnetic torque increasing from 230 to to the central area, where the cooling rates are similar at different torques. The closer to the central area, the less the influence of M-EMS on the cooling rate is. The ratio of the primary to secondary dendrite arm spacing is approximately 2.0, namely, λ1 ≈2λ2, and is constant irrespective of the stirring intensity and position of the billet. Original position analysis (OPA) results indicate that the center segregation of the billet is greatly improved, and the more uniform and compact solidification structure will be obtained with the increase of stirring intensity.