Journal
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
Volume 23, Issue 4, Pages 1131-1137Publisher
SPRINGER
DOI: 10.1007/s11665-014-0866-2
Keywords
austenite stability; Fe-8Mn-4Al-0.2C; microstructural evolution; TRIP effect; work hardening behavior
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Funding
- National Natural Foundation of China [51031001]
- Basic Scientific Research Foundation [N120602001]
- Center for Structural and Functional Materials, University of Louisiana at Lafayette, USA
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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 A degrees C followed by tempering at 200 A degrees 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 delta-ferrite to austenite during tempering, which improves the stability of austenite, thus contributing to enhanced tensile ductility.
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