Working Paper Article Version 1 This version is not peer-reviewed

Enhancing the Robustness and Efficiency in the Production of Medium Mn Steels by Al Addition

Version 1 : Received: 25 September 2020 / Approved: 26 September 2020 / Online: 26 September 2020 (11:35:29 CEST)

A peer-reviewed article of this Preprint also exists.

Bai, M.; Yang, D.; Wang, G.; Ryu, J.; Lee, K.; Yi, H. Enhancing the Robustness and Efficiency in the Production of Medium Mn Steels by Al Addition. Metals 2020, 10, 1432. Bai, M.; Yang, D.; Wang, G.; Ryu, J.; Lee, K.; Yi, H. Enhancing the Robustness and Efficiency in the Production of Medium Mn Steels by Al Addition. Metals 2020, 10, 1432.

Journal reference: Metals 2020, 10, 1432
DOI: 10.3390/met10111432

Abstract

The narrow process window during intercritical annealing and discontinuous yielding have limited the commercialisation of medium Mn steels. In this study, a double annealing process based on the commercial continuous annealing line is proposed. The cold-rolled medium Mn steels were first fully austenitized and quenched during the first annealing, followed by the intercritical annealing for reverted austenite transformation. The microstructure of duplex lath-shaped austenite and ferrite is produced and the steel exhibit a desirable continuous yielding during tensile deformation. Al is added into the medium Mn steel to enlarge the process window and to improve partitioning efficiency of Mn. The produced steel is more robust with temperature fluctuation during the industrial process due to the enlarged intercritical region. Mn partitioning is more efficient owing to elevated annealing temperature, which results in the improvement of ductility in the Al-added steel with increased austenite stability.

Keywords

Medium Mn steel; Al addition; Intercritical annealing; Temperature sensitivity; Mn partitioning

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