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A Reaction Between High Mn-High Al Steel and CaO-SiO2-Type Molten Mold Flux: Part II. Reaction Mechanism, Interface Morphology, and Al2O3 Accumulation in Molten Mold Flux

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Abstract

Following a series of laboratory-scale experiments, the mechanism of a chemical reaction \(4[\rm{Al}] + 3(\rm{SiO}_2) = 3[\rm{Si}] + 2(\rm{Al}_2\rm{O}_3)\) between high-alloyed TWIP (TWin-Induced Plasticity) steel containing Mn and Al and molten mold flux composed mainly of CaO-SiO2 during the continuous casting process is discussed in the present article in the context of kinetic analysis, morphological evolution at the reaction interface. By the kinetic analysis using a two-film theory, a rate-controlling step of the chemical reaction at the interface between the molten steel and the molten flux is found to be mass transport of Al in a boundary layer of the molten steel, as long as the molten steel and the molten flux phases are concerned. Mass transfer coefficient of the Al in the boundary layer (\(k_{\rm{Al}}\)) is estimated to be 0.9 to 1.2 × 10−4 m/s at 1773 K (\(1500\,^{\circ}\)C). By utilizing experimental data at various temperatures, the following equation is obtained for the \(k_{\rm{Al}}; \ln k_{\rm{Al}} = -14,290/T - 1.1107.\) Activation energy for the mass transfer of Al in the boundary layer is 119 kJ/mol, which is close to a value of activation energy for mass transfer in metal phase. The composition evolution of Al in the molten steel was well explained by the mechanism of Al mass transfer. On the other hand, when the concentration of Al in the steel was high, a significant deviation of the composition evolution of Al in the molten steel was observed. By observing reaction interface between the molten steel and the molten flux, it is thought that the chemical reaction controlled by the mass transfer of Al seemed to be disturbed by formation of a solid product layer of MgAl2O4. A model based on a dynamic mass balance and the reaction mechanism of mass transfer of Al in the boundary layer for the low Al steel was developed to predict (pct Al2O3) accumulation rate in the molten mold flux.

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Acknowledgment

This work was financially supported by POSCO Ltd. through the Steel Innovation Program (Project No. 20118060) to the Graduate Institute of Ferrous Technology, Pohang University of Science and Technology.

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Author notes

  1. Jung-Wook Cho (Principal Researcher)

    Present address: Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea

  2. Su-Wan Lee (Graduate Student)

    Present address: Steelmaking Department, Pohang Works, POSCO Ltd, Pohang, Republic of Korea

Authors and Affiliations

  1. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea

    Youn-Bae Kang (Assistant Professor), Min-Su Kim (Graduate Student), Su-Wan Lee (Graduate Student) & Hae-Geon Lee (Professor Emeritus)

  2. Technical Research Laboratories, POSCO Ltd, Gwangyang, Republic of Korea

    Jung-Wook Cho (Principal Researcher) & Min-Seok Park (Senior Researcher)

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  1. Youn-Bae Kang
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  2. Min-Su Kim
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  3. Su-Wan Lee
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  4. Jung-Wook Cho
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  5. Min-Seok Park
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Corresponding author

Correspondence to Youn-Bae Kang.

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Manuscript submitted August 21, 2012.

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Kang, YB., Kim, MS., Lee, SW. et al. A Reaction Between High Mn-High Al Steel and CaO-SiO2-Type Molten Mold Flux: Part II. Reaction Mechanism, Interface Morphology, and Al2O3 Accumulation in Molten Mold Flux. Metall Mater Trans B 44, 309–316 (2013). https://doi.org/10.1007/s11663-012-9769-5

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  • DOI: https://doi.org/10.1007/s11663-012-9769-5

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