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A Thermodynamic Model to Estimate the Formation of Complex Nitrides of Al x Mg(1–x)N in Silicon Steel

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Abstract

A complex nitride of Al x Mg(1−x)N was observed in silicon steels. A thermodynamic model was developed to predict the ferrite/nitride equilibrium in the Fe-Al-Mg-N alloy system, using published binary solubility products for stoichiometric phases. The model was used to estimate the solubility product of nitride compound, equilibrium ferrite, and nitride compositions, and the amounts of each phase, as a function of steel composition and temperature. In the current model, the molar ratio Al/(Al + Mg) in the complex nitride was great due to the low dissolved magnesium in steel. For a steel containing 0.52 wt pct Als, 10 ppm T.Mg., and 20 ppm T.N. at 1100 K (827 °C), the complex nitride was expressed by Al0.99496Mg0.00504N and the solubility product of this complex nitride was 2.95 × 10−7. In addition, the solution temperature of the complex nitride increased with increasing the nitrogen and aluminum in steel. The good agreement between the prediction and the detected precipitate compositions validated the current model.

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  1. LECO is a trademark of LECO Corporation, St. Joseph, MI.

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Acknowledgments

The authors are grateful for the support from the National Science Foundation of China (Grant Nos. 51504020 and 51404019), the Bei**g Key Laboratory of Green Recycling and Extraction of Metals (GREM), the Laboratory of Green Process Metallurgy and Modeling (GPM2), and the High Quality Steel Consortium (HQSC) at the School of Metallurgical and Ecological Engineering at the University of Science and Technology Bei**g (USTB, Bei**g, China).

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Authors and Affiliations

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Bei**g, Bei**g, 100083, China

    Yan Luo, Lifeng Zhang & Ming Li

  2. College of Applied Science and Engineering, Colorado School of Mines, Golden, CO, 80401, USA

    Seetharaman Sridhar

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  1. Yan Luo
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  2. Lifeng Zhang
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  3. Ming Li
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Correspondence to Lifeng Zhang.

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Manuscript submitted September 1, 2017.

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Luo, Y., Zhang, L., Li, M. et al. A Thermodynamic Model to Estimate the Formation of Complex Nitrides of Al x Mg(1–x)N in Silicon Steel. Metall Mater Trans B 49, 894–901 (2018). https://doi.org/10.1007/s11663-018-1219-6

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  • DOI: https://doi.org/10.1007/s11663-018-1219-6

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