The Solidification Mode of Fe-Mn-Al-C Lightweight Steel

Chan Young Lee, Young Kook Lee

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Solidification behavior and solid-state transformation were investigated in Fe-Mn-Al-C lightweight steel. The solidification mode of the Fe-9.3Mn-5.6Al-0.2C (wt.%) lightweight steel was predicted to be the F mode (liquid → liquid + δ-ferrite → δ-ferrite → δ-ferrite + γ-austenite), according to the classification of the solidification modes of stainless steels. However, the microstructures of an ingot of the lightweight steel showed that the solidification occurred by the FA mode (liquid → liquid + δ-ferrite → liquid + δ-ferrite + γ-austenite → δ-ferrite + γ-austenite). To examine the difference between predicted and actual solidification modes, some specimens were annealed at various temperatures ranging from 1200°C to 1450°C for 10 min and then quenched. The microstructures of the annealed specimens exhibited that there were the narrow ranges of single δ-ferrite and solidification sections. This result indicates that the solidification mode of the present steel was the F mode, matching well with the predicted solidification mode. The reason for the FA mode, which was observed in the ingot, was because the liquid passed by a narrow solidification section and a single δ-ferrite region, and it directly entered the dual-phase region of δ-ferrite and γ-austenite during cooling.

Original languageEnglish
Pages (from-to)1794-1799
Number of pages6
Issue number9
Publication statusPublished - 2014 Sept

Bibliographical note

Publisher Copyright:
© 2014, The Minerals, Metals & Materials Society.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)


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