Superplasticity in a lean Fe-Mn-Al steel

Jeongho Han, Seok Hyeon Kang, Seung Joon Lee, Megumi Kawasaki, Han Joo Lee, Dirk Ponge, Dierk Raabe, Young Kook Lee

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Abstract

Superplastic alloys exhibit extremely high ductility (>300%) without cracks when tensile-strained at temperatures above half of their melting point. Superplasticity, which resembles the flow behavior of honey, is caused by grain boundary sliding in metals. Although several non-ferrous and ferrous superplastic alloys are reported, their practical applications are limited due to high material cost, low strength after forming, high deformation temperature, and complicated fabrication process. Here we introduce a new compositionally lean (Fe-6.6Mn-2.3Al, wt.%) superplastic medium Mn steel that resolves these limitations. The medium Mn steel is characterized by ultrafine grains, low material costs, simple fabrication, i.e., conventional hot and cold rolling, low deformation temperature (ca. 650 °C) and superior ductility above 1300% at 850 °C. We suggest that this ultrafine-grained medium Mn steel may accelerate the commercialization of superplastic ferrous alloys.

Original languageEnglish
Article number751
JournalNature communications
Volume8
Issue number1
DOIs
Publication statusPublished - 2017 Dec 1

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Han, J., Kang, S. H., Lee, S. J., Kawasaki, M., Lee, H. J., Ponge, D., Raabe, D., & Lee, Y. K. (2017). Superplasticity in a lean Fe-Mn-Al steel. Nature communications, 8(1), [751]. https://doi.org/10.1038/s41467-017-00814-y