Dynamic Wetting of High-Al Steel by CaO-SiO2- and CaO-Al2O3-Based Mold Fluxes

Abstract

Wetting of steel by mold fluxes affects the surface quality of steel products. Reaction between [Al] and mold fluxes in the continuous casting of high-Al steel leads to a dynamic interfacial phenomenon. This work investigated the wetting of the high-Al steel substrate by CaO-SiO2-based and CaO-Al2O3-based mold fluxes. The interfacial tensions were estimated and related to their high-temperature structures. The interface morphology revealed that CaO-SiO2-based mold flux and CaO-Al2O3-based mold flux with CaO/Al2O3 = 1 exhibited deep reaction zones in the steel substrates and irregular flux/steel interfaces, while CaO-Al2O3-based mold fluxes with CaO/Al2O3 = 2 and 3 showed smooth interfaces and superficial reaction zones. The sedation of dynamic wetting behavior in Samples 3 and 4 was related to the high viscosity in the flux droplet after the initial composition change, which led to the stabilization of the interface.

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Acknowledgments

Financial supports from Baosteel-Australia Joint Research and Development Centre (BAJC) (BA16006) and Australian Research Council (ARC) Industrial Transformation Hub (IH140100035) are greatly acknowledged. The support for the thermodynamic calculation using FactSage 7.0 from Prof Yaru Cui, Xi’an University of Architecture and Technology is gratefully acknowledged.

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Correspondence to Jianqiang Zhang.

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Manuscript submitted April 8, 2019.

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Yang, J., Zhang, J., Ostrovski, O. et al. Dynamic Wetting of High-Al Steel by CaO-SiO2- and CaO-Al2O3-Based Mold Fluxes. Metall Mater Trans B 50, 2175–2185 (2019). https://doi.org/10.1007/s11663-019-01643-8

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