Microstructural Evolution and Deformation Behavior of a Hot-Rolled and Heat Treated Fe-8Mn-4Al-0.2C Steel

作者：Cai Zhihui^*; Ding Hua; Ying Zhengyan; Misra R D K

来源：Journal of Materials Engineering and Performance, 2014, 23(4): 1131-1137.

DOI：10.1007/s11665-014-0866-2

• austenite stability
• Fe-8Mn-4Al-0.2C
• microstructural evolution
• TRIP effect
• work hardening behavior

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.

• 出版日期2014-4
• 单位东北大学