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

被引：0

作者：

Zhihui Cai

Hua Ding

Zhengyan Ying

R. D. K. Misra

机构：

[1] Northeastern University,School of Materials and Metallurgy

[2] University of Louisiana at Lafayette,Laboratory for Excellence in Advanced Steel Research, Center for Structural and Functional Materials

来源：

Journal of Materials Engineering and Performance | 2014年 / 23卷

关键词：

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

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学科分类号：

摘要：

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.

引用

页码：1131 / 1137

页数：6