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Nonisothermal Crystallization Kinetics of Glassy Mold Fluxes

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Abstract

Crystallization of the solid glassy mold flux film occurring in the gap between the initial shell and mold wall is important, as it determines the in-mold heat transfer and mold lubrication during the process of continuous casting. In order to study the nonisothermal crystallization behavior of the glassy mold flux film in the continuous casting mold, the continuous heating transformation diagram, crystallization mechanism, and precipitate phases were investigated using the single hot thermocouple technique, kinetic models, a scanning electron microscope, and an energy-dispersive spectrometer (EDS). The results show that the initial crystallization temperature for CaO-SiO2 based flux A ranges from [1086 K to 1147 K (813 °C to 874 °C)], which is lower than the case of CaO-Al2O3 based flux B ranging from [1205 K to 1245 K (932 °C to 972 °C)]. The crystallization kinetics for flux A are constant nucleation rate, two-dimensional growth, and control by diffusion. For flux B, they are constant nucleation rate, three-dimensional growth, and control by interface reaction. Besides, the EDS results indicate that the precipitate crystals in fluxes A and B are CaSiO3 and Ca2AlSiO4, respectively.

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Acknowledgments

Financial support from the National Science Foundation of China (Grant Nos. 51504294 and U1760202) and the opening foundation from the Ministry of Education Key Laboratory of Metallurgical Emission Reduction & Resources Recycling (Anhui University of Technology) is greatly acknowledged.

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, China

    Lejun Zhou, Huan Li & Wanlin Wang

  2. National Center for International Research of Clean Metallurgy, Central South University, Changsha, 410083, China

    Lejun Zhou, Huan Li & Wanlin Wang

  3. Aquion Energy, LLC, 32 39th Street, Pittsburgh, PA, 15201, USA

    Jiang Chang

Authors
  1. Lejun Zhou
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  2. Huan Li
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  3. Wanlin Wang
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Correspondence to Wanlin Wang.

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Manuscript submitted June 12, 2018.

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Zhou, L., Li, H., Wang, W. et al. Nonisothermal Crystallization Kinetics of Glassy Mold Fluxes. Metall Mater Trans B 49, 3019–3029 (2018). https://doi.org/10.1007/s11663-018-1427-0

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