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Effect of Solution Treatment on Grain Size and Toughness of Lightweight Fe-Mn-Al-C Steel

A significant body of work has been produced on advanced high strength steels to reduce weight and fuel consumption of modern vehicles. Steels with increased concentrations of both aluminum and manganese, termed Fe-Mn-Al-C steel, have been developed to fit this need. Alloys that contain 0.3 to 1.2 wt. pct. carbon and 5 to 11 wt. pct. aluminum are also age hardenable in the temperature range of 840 °F to 1290 °F (450 to 700 °C) [1-9]. Age-hardening will produce a microstructure containing coherent nano-sized ê-carbide precipitate, (Fe,Mn)3AlC. The work by Kayak, and Kim et al. [8,9] showed that through precipitation strengthening high strength and ductile alloys were a prime candidate for springs and landing gears. After age hardening these steels have been shown to have strength and toughness equivalent to quench and tempered steels [2, 3, 8-10]. Alloying with aluminum has a secondary benefit, when concentrations exceed 12 wt. pct. a density reduction of 16-17 pct. can also be obtained [1-3, 11, 12]. This reduction in density is attributed to two root causes: first a dilation of the lattice and the second is the substitution of iron atoms for the less dense aluminum atoms. These steels therefore are an especially attractive candidate for weight reduction in transportation due to the associated decrease in density and a match in strength with current materials.
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2019 AISTech Conference Proceedings
PR-377-233
D.M. Field, and K.R. Limmer
May 01, 2019
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