High-strength Fe–20Mn–Al–C-based Alloys with Low Density
2010; The Iron and Steel Institute of Japan; Volume: 50; Issue: 6 Linguagem: Inglês
10.2355/isijinternational.50.893
ISSN1347-5460
AutoresYuji Sutou, Naohide Kamiya, Umino Reiko, Ikuo Ohnuma, Kiyohito Ishida,
Tópico(s)Advanced materials and composites
ResumoMechanical properties of Fe–20Mn–(10–14)Al–(0–1.8)C (mass%) quaternary and Fe–20Mn–(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 7.0 g/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–20Mn–11Al–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–20Mn–Al–C(–5Cr) alloys showed a higher specific strength than conventional steels.
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