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A New Kinetic Mode During the Austenite-to-Ferrite Transformation in Fe–Mn and Fe–Mn–Mo Alloys

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The kinetics of isothermal austenite (γ)-to-ferrite (α) transformation at various temperatures in Fe–2Mn and Fe–2Mn–0.5Mo (wt%) alloys is investigated via dilatometry experiments and phase-field modeling. It was interestingly found that Mo addition has a marginal effect on the transformation kinetics. Besides the well-known partitioning and partitionless transformation modes, a new kinetic mode, in which interface migration is controlled by interfacial diffusion, was identified. The phase-field model with considering interfacial segregation could well predict the transformation kinetics and the kinetic mode transition.

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Acknowledgements

Z.-G. Yang acknowledges the financial support from the National Natural Science Foundation of China (Grant Nos. U174252, 51771100). H. Chen acknowledges the financial support from National Natural Science Foundation of China (Grant Nos. U1808208, U1860109, 51922054), the Beijing Natural Science Foundation (No. 2182024) and the National Key R&D program of China (No. 2016YFB0300104). C. Zhang acknowledges the financial support from the National Natural Science Foundation of China (Grant No. 2015CB654802), the National Magnetic Confinement Fusion Energy Research Project of China (Grant No. 2015GB118001) and the Fund of Key Laboratory of Advanced Materials of Ministry of Education (Grant No. 2017AML09).

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Authors and Affiliations

  1. Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China

    Cong-Yu Zhang, Hao Chen, Jia-Ning Zhu, Chi Zhang & Zhi-Gang Yang

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  1. Cong-Yu Zhang
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  2. Hao Chen
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  3. Jia-Ning Zhu
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  4. Chi Zhang
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  5. Zhi-Gang Yang
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Correspondence to Hao Chen.

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Zhang, CY., Chen, H., Zhu, JN. et al. A New Kinetic Mode During the Austenite-to-Ferrite Transformation in Fe–Mn and Fe–Mn–Mo Alloys. Acta Metall. Sin. (Engl. Lett.) 33, 975–980 (2020). https://doi.org/10.1007/s40195-020-01026-y

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  • DOI: https://doi.org/10.1007/s40195-020-01026-y

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