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Mechanism of Interface Reactions Between Fe-2%Al Alloy and High-Silica Tundish Refractory

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Abstract

The reactions between a Fe-2%Al alloy and a high-silica tundish refractory were investigated at 1550 °C in an alumina crucible using a high-frequency induction furnace. The reaction between the dissolved aluminum in the molten alloy and the oxidizing components in the refractory took place at the interface, generating a MgO·Al2O3 spinel as the main product, which was confirmed by both experimental and FactSage™ 7.0 calculated results. Several layers were detected at the interface depending on an aluminum diffusion in the refractory material and the reaction time. However, the formation of MgO·Al2O3 spinel layer at the interface delayed the reduction of silica because aluminum diffusion became very slow through the interfacial layer. The mass transfer coefficient of silicon in the Fe-2%Al alloy was 7.91 × 10−4 m/s. FactSage™ 7.0 calculated results indicated that the content of silicon in the alloy was higher than that of magnesium, as the result of transformation of forsterite phase to MgO·Al2O3 spinel at the interface.

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Acknowledgements

The authors are grateful for the support from National Science Foundation China (Grant Nos. 51874031 and 51725402), the High Quality Steel Consortium (HQSC) and Green Process Metallurgy and Modeling (GPM2) at the School of Metallurgical and Ecological Engineering at University of Science and Technology Beijing (USTB), China.

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  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, People’s Republic of China

    Abdulaziz Alhussein & Wen Yang

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  1. Abdulaziz Alhussein
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  2. Wen Yang
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Correspondence to Wen Yang.

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Alhussein, A., Yang, W. Mechanism of Interface Reactions Between Fe-2%Al Alloy and High-Silica Tundish Refractory. Trans Indian Inst Met 72, 591–602 (2019). https://doi.org/10.1007/s12666-018-1490-x

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