1. School of Iron and Steel, Soochow University, Suzhou 215137, Jiangsu,China; 2. Ningbo Branch, China Academy of Ordnance Science, Ningbo 315103, Zhejiang, China; 3. Laigang Technique Center, Shandong Iron and Steel Group Company Limited, Jinan 271104, Shandong, China
Abstract:High-speed casting is charaterized by high efficiency and lower cost, indicating the future of continuous casting process. Taking the conventional slab for example, the large eddy simulation (LES) method is adopted to study the slag entrapment in a casting mold. Results reveal that the flow field during low casting speed remains steady. This leads to the fact that the upward flow velocity and the fluctuations of slag-metal interface are quite low. By comparison, under the effect of high casting speed, the impingement velocity of steel increases, and more slag drops are involved into the mold. Through analyzing the maximum velocity of the slag-metal interface, a new criterion for the critical velocity of slag entrapment is established. It is found that the critical velocity of slag entrapment is different under different casting speed. The reason for this phenomenon is because of the differences of slag entrapment mechanisms. This model has a certain guiding significance to control the production of high-speed continuous casting.
Teshima T, Kubota J, Suzuki M, et al. Influence of casting conditions on molten steel flow in continuous casting mold at high speed casting of slabs[C]//Steelmaking Conference Proceedings. Tokyo: Transactions of the Iron and Steel Institute of Japan, 1988.
Walker J S, Talmage G, Brown S H, et al. Effects of magnetic field orientation on a liquid-metal free surface in a sliding electrical contact[J]. Journal of Applied Physics, 1992, 71(8): 3713.
[19]
Kordyban E S, Ranov T. Mechanism of slug formation in horizontal two-phase flow[J]. Journal of Fluids Engineering, 1970, 92(4): 857.
[20]
Ishii M, Grolmes M A. Inception criteria for droplet entrainment in two-phase concurrent film flow[J]. AIChE Journal, 1975, 21(2): 308.
[21]
Kubota J, Okimoto K, Shirayama A, et al. Meniscus flow control in the mold by traveling magnetic field for high-speed slab caster[C]//74rd Steelmaking Conference Proceedings. Washington: Iron and Steel Society, 1991: 233.
Thomas B G, Yuan Q, Sivaramakrishnan S, et al. Comparison of four methods to evaluate fluid velocities in a continuous slab casting mold[J]. ISIJ International, 2001, 41(10): 1262.
[31]
Pericleous K, Djambazov G, Domgin J F, et al. Dynamic modelling and validation of the metal/flux interface in continuous casting[C]//6th ECC Conference. London: The Institution of Mining and Metallurgy, 2008, 1.
[32]
LIU Z Q, SUN Z B, LI B K. Modeling of quasi-four-phase flow in continuous casting mold using hybrid Eulerian and Lagrangian approach[J]. Metallurgical and Materials Transactions B, 2017, 48(2): 1248.
[33]
LI X L, LI B K, LIU Z Q, et al. Large eddy simulation of electromagnetic three-phase flow in a round bloom considering solidified shell[J]. Steel Research International, 2019, 90(4): 1.
[34]
LI X L, LI B K, LIU Z Q, et al. Large eddy simulation of multi-phase flow and slag entrapment in a continuous casting mold[J]. Metals, 2019, 9(1): 1.
[35]
LI X L, LI B K, LIU Z Q, et al. In-situ analysis and numerical study of inclusion distribution in a vertical-bending caster [J]. ISIJ International, 2018, 58(11): 2052.
Cho S M, Thomas B G, Kim S H. Effect of nozzle port angle on transient flow and surface slag behavior during continuous steel-slab casting[J]. Metallurgical and Materials Transactions B, 2019, 50(1): 52.
[38]
Yang H J, Vanka S P, Thomas B G. Mathematical modeling of multiphase flow in steel continuous casting[J]. ISIJ International, 2019, 59(6): 956.