• Sandim, Hugo Ricardo Zschommler
• Raabe, Dierk
• Renzetti, Reny Angela
• Bernardi, Heide Heloise
• Hartwig, K. T.
• Sandim, M. J. R.
• Renzetti, R. A.

Abstract

<jats:p>Polycrystalline iron was deformed by eight ECAE passes using the route Bc to a total strain of 9.2. After deformation the material was annealed at temperatures up to 800oC. Scanning electron microscopy (SEM) and high-resolution electron backscatter diffraction (EBSD) were used to characterize both deformed and annealed structures. In the as-deformed state, the mean grain size is 650 nm and the volume fraction of high angle boundaries (VHAB) is 56%. Upon annealing there is a pronounced softening above 300oC. At the beginning of recrystallization, at about 400oC, the VHAB increases to 71%. The results indicate that discontinuous recrystallization is the main softening mechanism in severely deformed iron.</jats:p>

Topics

• impedance spectroscopy
• grain
• grain size
• scanning electron microscopy
• iron
• annealing
• electron backscatter diffraction
• recrystallization