Effect of Argon Blowing Rate on Multiphase Flow and Initial Solidification in a Slab Mold
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NG, HUA ZHANG, and HONGWEI NI are with The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, No. 947, Heping Avenue, Qingshan District, Wuhan, 430081, P.R. China and also with the Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, P.R. China and also with the Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan 430081, P.R. China. Contact e-mails: [email protected]; [email protected] JIANAN ZHOU is with The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology and also with the Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology. CHENGSONG LIU is with The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology and also with the Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, Wuhan University of Science and Technology and also with the Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology and also with the Department of Materials Science and Engineering, Carnegie Mellon University, PA 15213. Manuscript submitted October 28, 2019.
METALLURGICAL AND MATERIALS TRANSACTIONS B
INTRODUCTION
DURING the slab continuous casting (CC) process, the flow, heat transfer, solidification of the molten steel, and the interaction of the steel/slag interface in the mold are quite complex, having a deep influence on the quality of the final products.[1,2] The molten steel flows from the submerged entry nozzle (SEN) into the mold cavity and hits the narrow face of the water-cooled copper wall mold at high speed, forming a double-circulation flow. The upper recirculation zone scours the slag layer, while the lower recirculation zone flows deep into the molten pool.[3,4] At the same time, the molten steel begins to solidify at the meniscus, forming the initial solidified shell. As the casting slab moves downward at the casting speed, the thickness of the solidified shell keeps growing, and the flow field, temperature field, and level fluctuation in the mold also alter correspondingly.[5,6] Cho et al.[7] and Jin et al.[8] numerically and experimentally investigated the multiphase flow behavior in slab molds, improving our understanding of the formation of slag entrainment. Liu et al.[9] investigated the multiphase flow in a slab mold, presented a dimensionless value of Have=h to describe the level fluctuation of slag–steel interface, and found that when the value of Have=his greater than 0.4, slag eye near the SEN would be formed. Zhang et al.[10] two-dimensionally studied fluid flow and solidification behaviors in slab molds, and predicted the formation of oscillation marks of the solidified shell. Long et al.[11] combined a
hybrid 3D/2D model for flow and solidi
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