articlesteel research internationalSep 1, 2006Closed access

Microstructures and Mechanical Properties of High‐Strength Fe‐Mn‐Al‐C Light‐Weight TRIPLEX Steels

GFG. FrommeyerUBU. Brüx

Max-Planck-Institut für Nachhaltige Materialien

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Abstract

High‐strength TRIPLEX light‐weight steels of the generic composition Fe‐xMn‐yAl‐zC contain 18 ‐ 28 % manganese, 9 ‐ 12 % aluminium, and 0.7 ‐ 1.2 % C (in mass %). The microstructure is composed of an austenitic γ‐Fe(Mn, Al, C) solid solution matrix possessing a fine dispersion of nano size κ‐carbides (Fe,Mn) 3 AlC 1‐x and α‐Fe(Al, Mn) ferrite of varying volume fractions. The calculated Gibbs free energy of the phase transformation γ fcc → ∊ hcp amounts to ΔG γ→∊ = 1757 J/mol and the stacking fault energy was determined to Γ SF = 110 mJ/m 2 . This indicates that the austenite is very stable and no strain induced ∊‐martensite will be formed. Mechanical twinning is almost inhibited during plastic deformation. The…

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Topics & keywords

Topics
Keywords
  • Materials science
  • Austenite
  • Stacking-fault energy
  • Microstructure
  • Ultimate tensile strength
  • Ferrite (magnet)
  • Carbide
  • Metallurgy
UN Sustainable Development Goals
  • Affordable and clean energy
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