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Microstructural Developments and Tensile Properties of Lean Fe-Mn-Al-C Lightweight Steels

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Abstract

Concepts of Fe-Al-Mn-C-based lightweight steels are fairly simple, but primary metallurgical issues are complicated. In this study, recent studies on lean-composition lightweight steels were reviewed, summarized, and emphasized by their microstructural development and mechanical properties. The lightweight steels containing a low-density element of Al were designed by thermodynamic calculation and were manufactured by conventional industrial processes. Their microstructures consisted of various secondary phases as κ-carbide, martensite, and austenite in the ferrite matrix according to manufacturing and annealing procedures. The solidification microstructure containing segregations of C, Mn, and Al produced a banded structure during the hot rolling. The (ferrite + austenite) duplex microstructure was formed after the annealing, and the austenite was retained at room temperature. It was because the thermal stability of austenite nucleated from fine κ-carbide was quite high due to fine grain size of austenite. Because these lightweight steels have outstanding properties of strength and ductility as well as reduced density, they give a promise for automotive applications requiring excellent properties.

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Acknowledgements

This work was supported by the Ministry of Knowledge Economy under a Grant No. 10031723-2011-21. The authors would like to thank Mr. Hyuk-Joong Lee of POSTECH for his help with the correlation between alloying effects and microstructural developments.

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Authors and Affiliations

  1. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, Pohang, 790-784, Korea

    S. S. Sohn, S. Lee & B.-J. Lee

  2. Sheet Products & Process Research Group, Technical Research Laboratories, POSCO, Kwangyang, 545-090, Korea

    J.-H. Kwak

Authors
  1. S. S. Sohn
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  2. S. Lee
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  3. B.-J. Lee
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  4. J.-H. Kwak
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Correspondence to J.-H. Kwak.

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Sohn, S.S., Lee, S., Lee, BJ. et al. Microstructural Developments and Tensile Properties of Lean Fe-Mn-Al-C Lightweight Steels. JOM 66, 1857–1867 (2014). https://doi.org/10.1007/s11837-014-1128-3

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  • DOI: https://doi.org/10.1007/s11837-014-1128-3

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