Abstract
The tensile properties of Fe-0.6C-1.5Si-0.8Mn steel can be dramatically improved by the following modified austempering (Mod Aus) treatment : The Mod Aus treatment involved conventional austenitizing at 1173 K followed by subcritical annealing at 933 K in the two-phase region of ferrite (α) and austenite (γ) and then austempering at 673 K with subsequent water quenching and by tempering by 473 K. The Mod Aus steel consisted of the triple structures of carbide-free upper bainite, 29 vol.% retained austenite and 10 vol.% ferrite. Compared to the conventional austemper, the Mod Aus treatment significantly improved the total elongation (TE) with a similar ultimate tensile stress (σ u ). This treatment also significantly improved the notch tensile stress (NTS). Compared to the quenched and tempered steel with a similar σ u , the Mod Aus treatment significantly developed the TE of the steel with a similar NTS. The austempering treatment coupled with intercritical annealing in the two-phase region of α and γ produced the triple structures of bainite, ferrite and retained austenite. However, this treatment yielded mechanical properties inferior to those obtained with the Mod Aus treatment. The results are described and discussed.
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