Abstract
In this paper, a simultaneous thermal analyzer carried out isothermal eutectoid transformation experiments of Fe–0.4Mn, Fe–1.2Mn, and Fe–1.2Mn–0.2Si alloys. The kinetic model of the isothermal phase transformation of FeO was established using the Johnson–Mehl–Avrami–Kolmogorov (JMAK) equation combined with the experimental data. The kinetic model of the eutectoid transformation of FeO in a non-isothermal process was also established based on Scheil's additivity rule and the mapped-out FeO. The CCT diagram shows that increasing the Mn content and adding Si elements during the continuous cooling process cause the phase zone where the FeO layer undergoes eutectoid transformation to shift to the right. Due to the similarity of crystal structures, the (Fe, Mn)O solid solution formed by FeO and MnO improves the stability of FeO. Mn2+ widens the spacing between oxide ions, and with the increase in Mn content, the Gibbs energy of the formation of (Fe, Mn)O becomes too small to compensate for that of the formation of α-Fe from (Fe, Mn)O. In addition, the temperature point at which the phase transformation of FeO occurs decreases with the increase in Mn content, resulting in the decrease in phase transformation supercooling, so the increase in Mn content will inhibit the eutectoid transformation. The addition of elemental Si resulted in the formation of a cation-deficient FeO with higher O content and lower Fe content, and the time for the Fe2+ concentration to reach supersaturation was prolonged, thus further inhibiting the onset of the eutectoid transformation.
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Acknowledgements
This work was supported by National Key Research and Development Program of China (Grant No.2022YFB3304800), the Reviving-Liaoning Excellence Plan (XLYC2203186), Science and Technology Special Projects of Liaoning Province, China (Grant No. 2022JH25/10200001), and Postdoctoral Science Foundation of China (Grant No. 2021M701167).
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Guangming Cao was contributed to investigation, writing—review and editing, and funding acquisition. Wencong Zhao and Wentao Song were contributed to conceptualization, methodology, investigation, writing—original draft and editing. Hengxiang Yu and Silin Li was contributed to investigation. Zhenyu Liu was contributed to conceptualization, methodology, project administration.
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Cao, G., Zhao, W., Song, W. et al. Influence of Mn–Si elements on the kinetics of oxidative phase transformation under continuous cooling conditions and modeling study. J Mater Sci 59, 9593–9609 (2024). https://doi.org/10.1007/s10853-024-09746-7
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DOI: https://doi.org/10.1007/s10853-024-09746-7