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

S. S. Sohn, S. Lee, B. J. Lee, J. H. Kwak

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1857-1867
Number of pages11
Issue number9
Publication statusPublished - 2014 Sept
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)


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