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Kinetic Constraints of δ-Ferrite to the Formation of Kappa (κ) Carbide in a Fe-4Mn-9Al-0.3C Wt Pct Low-Density Steel

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Abstract

Aluminum is the key ingredient in low-density steels. It leads to the formation of δ-ferrite in a large fraction. In order to study the influence, two different experimental approaches were devised. In a first of its kind, the sample was arc melted in an argon atmosphere. Later, the same alloy composition was ball milled and sintered at 1000 °C by avoiding liquid to δ-ferrite in the system. In the current study, the comparative analysis led by DICTRA simulation indicates that kappa (κ) carbide has difficulty forming in the present alloy system when δ-ferrite is already available, particularly during solidification casting.

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Acknowledgments

The authors acknowledge the Department of Science and Technology, Government of India, for the financial support (File Number CRG/2018/002432), and Dr. P.P. Chattopadhyay for valuable remarks.

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Correspondence to Sadhan Ghosh.

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Manuscript submitted July 10, 2019.

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Sinha, M., Ahad, S., Chaudhry, A.K. et al. Kinetic Constraints of δ-Ferrite to the Formation of Kappa (κ) Carbide in a Fe-4Mn-9Al-0.3C Wt Pct Low-Density Steel. Metall and Mat Trans A 51, 809–817 (2020). https://doi.org/10.1007/s11661-019-05568-4

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