Interfacial Reaction Between High-Al Steel and CaO-Al2O3-Based Mold Fluxes with Different CaO/Al2O3 Ratios at 1773 K (1500 °C)

Abstract

The reaction between high-Al steel and CaO-Al2O3-based mold fluxes with different CaO/Al2O3 ratios was investigated at 1773 K (1500 °C). The increase of CaO/Al2O3 ratio from 1 to 3 accelerated the accumulation of Al2O3 in the flux and reduction of Na2O, but had no significant effect on the reduction of SiO2 and B2O3. The microstructure of flux-steel interfaces showed that emulsification occurred in the reaction between steel and mold flux. The emulsification was affected by the precipitation of crystals in the flux after the change of flux composition due to the interfacial reaction.

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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.

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Correspondence to Jianqiang Zhang.

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Manuscript submitted February 21, 2019.

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Yang, J., Cui, H., Zhang, J. et al. Interfacial Reaction Between High-Al Steel and CaO-Al2O3-Based Mold Fluxes with Different CaO/Al2O3 Ratios at 1773 K (1500 °C). Metall Mater Trans B 50, 2636–2646 (2019). https://doi.org/10.1007/s11663-019-01667-0

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