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On the Eutectoid Reaction in a Quaternary Fe-C-Mn-Al Alloy: Austenite → Ferrite + Kappa-Carbide + M23C6 Carbide

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Abstract

Lamellae of ferrite, kappa-carbide, and M23C6 carbide are involved in a eutectoid reaction of an Fe-C-Mn-Al alloy after isothermal holding at temperatures below 923 K (650 °C). These lamellar phases are product phases from the decomposition of austenite during the eutectoid reaction of the quaternary alloy, i.e., austenite → ferrite + kappa-carbide + M23C6 carbide. Since the Al concentration in the steel is higher than that of the eutectoid composition, proeutectoid ferrite and kappa-carbide appear in the austenite prior to the eutectoid reaction to reduce the Al content of the retained austenite. The retained austenite decomposes into ferrite, kappa-carbide, and M23C6 carbide during the eutectoid reaction.

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Acknowledgments

The authors at the National Taiwan University of Science and Technology acknowledge the financial support for this article by the National Science Council, Taiwan, under Grant No. NSC-102-2221-E-011-022.

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Correspondence to Wei-Chun Cheng.

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Manuscript submitted February 5, 2013.

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Cheng, WC., Song, YS., Lin, YS. et al. On the Eutectoid Reaction in a Quaternary Fe-C-Mn-Al Alloy: Austenite → Ferrite + Kappa-Carbide + M23C6 Carbide. Metall Mater Trans A 45, 1199–1216 (2014). https://doi.org/10.1007/s11661-013-2083-2

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