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Hot Deformation and Dynamic Recrystallization Behavior of Austenite-Based Low-Density Fe–Mn–Al–C Steel

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The hot deformation and dynamic recrystallization (DRX) behavior of austenite-based Fe–27Mn–11.5Al–0.95C steel with a density of 6.55 g cm−3 were investigated by compressive deformation at the temperature range of 900–1150 °C and strain rate of 0.01–10 s−1. Typical DRX behavior was observed under chosen deformation conditions and yield-point-elongation-like effect caused by DRX of δ-ferrite. The flow stress characteristics were determined by DRX of the δ-ferrite at early stage and the austenite at later stage, respectively. On the basis of hyperbolic sine function and linear fitting, the calculated thermal activation energy for the experimental steel was 294.204 kJ mol−1. The occurrence of DRX for both the austenite and the δ-ferrite was estimated and plotted by related Zener–Hollomon equations. A DRX kinetic model of the steel was established by flow stress and peak strain without considering dynamic recovery and δ-ferrite DRX. The effects of deformation temperature and strain rate on DRX volume fraction were discussed in detail. Increasing deformation temperature or strain rate contributes to DRX of both the austenite and the δ-ferrite, whereas a lower strain rate leads to the austenite grains growth and the δ-ferrite evolution, from banded to island-like structure.

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Acknowledgments

The authors would like to express their gratitude to the Materials Testing Centre at the University of Science and Technology Beijing for the access to the Gleeble-1500 thermal–mechanical simulator and to Beijing General Research Institute of Mining and Metallurgy for TEM observation.

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Correspondence to Ren-Bo Song.

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Available online at http://link.springer.com/journal/40195

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Li, YP., Song, RB., Wen, ED. et al. Hot Deformation and Dynamic Recrystallization Behavior of Austenite-Based Low-Density Fe–Mn–Al–C Steel. Acta Metall. Sin. (Engl. Lett.) 29, 441–449 (2016). https://doi.org/10.1007/s40195-016-0406-1

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  • DOI: https://doi.org/10.1007/s40195-016-0406-1

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