Abstract
The microstructural evolution following tensile deformation of a hot-rolled and heat treated Fe-8Mn-4Al-0.2C steel was studied. Quenching in the range of 750-800 °C followed by tempering at 200 °C led to a ferrite-austenite mixed microstructure that was characterized by excellent combination of tensile strength of 800-1000 MPa and elongation of 30-40%, and a three-stage work hardening behavior. During the tensile deformation, the retained austenite transformed into martensite and delayed the onset of necking, thus leading to a higher ductility via the transformation-induced plasticity (TRIP) effect. The improvement of elongation is attributed to diffusion of carbon from δ-ferrite to austenite during tempering, which improves the stability of austenite, thus contributing to enhanced tensile ductility.
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Acknowledgments
This study was financially supported by the National Natural Foundation of China (No: 51031001) and Basic Scientific Research Foundation (No: N120602001). One of authors (R.D.K. Misra) acknowledges support from Center for Structural and Functional Materials, University of Louisiana at Lafayette, USA.
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Cai, Z., Ding, H., Ying, Z. et al. Microstructural Evolution and Deformation Behavior of a Hot-Rolled and Heat Treated Fe-8Mn-4Al-0.2C Steel. J. of Materi Eng and Perform 23, 1131–1137 (2014). https://doi.org/10.1007/s11665-014-0866-2
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DOI: https://doi.org/10.1007/s11665-014-0866-2