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Effect of Microstructure on Tensile Behavior and Mechanical Stability of Retained Austenite in a Cold-Rolled Al-Containing TRIP Steel

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

In the present study, a quenching treatment prior to two-stage heat treatment was conducted on a Fe–0.28C–1.55Mn–2.06Al transformation-induced plasticity steel to tailor the final microstructure. Compared with the microstructure of the ferrite, bainite and blocky retained austenite obtained by conventional two-stage heat treatment, the microstructure subjected to quenching plus two-stage heat treatment was composed of the ferrite, lath bainite and film-like retained austenite. The corresponding tensile behavior and mechanical stability of retained austenite were investigated by scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The results show that the mechanical stability of blocky retained austenite grains is lower and most of them transform to martensite during the tensile deformation, which leads to higher ultimate tensile strength and instantaneous work hardening exponent. Film-like retained austenite has relatively higher stability, which could cause sustained work hardening and high ductility as well as product of strength and elongation.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51501031) and the Natural Science Foundation of Liaoning Province (No. 20170520348).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, China

    Yang Zhao & Shu Yan

  2. State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, China

    Wen-Ting Zhu & Li-Qing Chen

Authors
  1. Yang Zhao
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  2. Wen-Ting Zhu
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  3. Shu Yan
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  4. Li-Qing Chen
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Corresponding author

Correspondence to Yang Zhao.

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

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Zhao, Y., Zhu, WT., Yan, S. et al. Effect of Microstructure on Tensile Behavior and Mechanical Stability of Retained Austenite in a Cold-Rolled Al-Containing TRIP Steel. Acta Metall. Sin. (Engl. Lett.) 32, 1237–1243 (2019). https://doi.org/10.1007/s40195-019-00890-7

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  • DOI: https://doi.org/10.1007/s40195-019-00890-7

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