High-strength Fe-2OMn-Al-C-based alloys with low density

Yuji Sutou, Naohide Kamiya, Reiko Umino, Lkuo Ohnuma, Kiyohito Ishida

Research output: Contribution to journalArticlepeer-review

197 Citations (Scopus)


Mechanical properties of Fe-2OMn-(10-14)Al-(0-1.8)C (mass%) quaternary and Fe-2OMn-(10-14)Al- (0.75-1.8)C-5Cr (mass%) quinary alloys were investigated by hardness, cold-workability and tensile tests at room temperature. The γ(fcc) alloys in both quaternary and quinary systems with a low density of less than 7.Og/cm3 showed an excellent ductility and their hardness and tensile strength increased with increasing Al and C contents. The γ+α(bcc) duplex alloys also exhibited a high tensile strength by controlling the α volume fraction. TEM observation confirmed that high hardness and tensile strength of the alloys with high Al and C contents are caused by the precipitation of nano-size κ-carbide with perovskite structure during cooling from the annealing temperature. Fe-2OMn-11AI-1.8C-5Cr alloy with a density of 6.51 g/cm3 showed a high specific strength of more than 180 MPa cm3/g with a good tensile elongation of 40%. The present Fe- 2OMn-Al-C(-5Cr) alloys showed a higher specific strength than conventional steels.

Original languageEnglish
Pages (from-to)893-899
Number of pages7
JournalISIJ International
Issue number6
Publication statusPublished - 2010


  • κ phase
  • Fe-Mn-Al-C alloy
  • Fe-Mn-Al-C-Cr alloy
  • High specific strength
  • Low density
  • Precipitation hardening


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