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Phase Transformations of an Fe-0.85 C-17.9 Mn-7.1 Al Austenitic Steel After Quenching and Annealing

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Abstract

Low-density Mn-Al steels could potentially be substitutes for commercial Ni-Cr stainless steels. However, the development of the Mn-Al stainless steels requires knowledge of the phase transformations that occur during the steel making processes. Phase transformations of an Fe-0.85 C-17.9 Mn-7.1 Al (wt.%) austenitic steel, which include spinodal decomposition, precipitation transformations, and cellular transformations, have been studied after quenching and annealing. The results show that spinodal decomposition occurs prior to the precipitation transformation in the steel after quenching and annealing at temperatures below 1023 K and that coherent fine particles of L12-type carbide precipitate homogeneously in the austenite. The cellular transformation occurs during the transformation of high-temperature austenite into lamellae of austenite, ferrite, and kappa carbide at temperatures below 1048 K. During annealing at temperatures below 923 K, the austenite decomposes into lamellar austenite, ferrite, κ-carbide, and M23C6 carbide grains for another cellular transformation. Last, when annealing at temperatures below 873 K, lamellae of ferrite and κ-carbide appear in the austenite.

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Acknowledgements

The authors acknowledge the financial support for this article by the National Science Council, Taiwan, under Grant NSC-102-2221-E-011-022. The authors also acknowledge Professor P. C. Pistorius in Carnegie Mellon University for providing FactSage software to calculate the phase diagrams of the Fe-C-Mn-Al steels.

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  1. Department of Mechanical Engineering, National Taiwan University of Science and Technology, 43 Keelung Road, Section 4, Taipei, 106, Taiwan

    Wei-Chun Cheng

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  1. Wei-Chun Cheng
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Correspondence to Wei-Chun Cheng.

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Cheng, WC. Phase Transformations of an Fe-0.85 C-17.9 Mn-7.1 Al Austenitic Steel After Quenching and Annealing. JOM 66, 1809–1820 (2014). https://doi.org/10.1007/s11837-014-1088-7

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  • DOI: https://doi.org/10.1007/s11837-014-1088-7

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