High-temperature deformation behaviour of Fe3Al

High-temperature deformation behaviour and workability have been determined for an Fe,Al-based alloy. The composition of the alloy (Fe-16.5Al-5.5Cr-1. 0Nb-0.05C) was one developed at Oak Ridge National Laboratory. Compression tests of samples from as-cast ingots and from hot-rolled + annealed plate w ere carried out over a range of temperatures (900-1200 degrees C) and strai n rates (10(-3)-10 s(-1)). Three types of deformation behaviour are observe d: (I) partial dynamic softening, (II) dynamic recrystallization; and (III) dynamic recrystallization with grain coarsening. The data are fitted to a single constitutive equation which describes the temperature and strain rat e dependence of flow stress. The alloy is resistant to flow localization, b ut workability is limited by tensile edge cracking. (C) 1998 Elsevier Scien ce S.A. All rights reserved.