Orientation imaging microscopy studies of recrystallization in interstitial-free steel |
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Authors: | Y Y Tse and B J Duggan |
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Affiliation: | (1) School of Metals and Materials, The University of Birmingham, B15 2TT Birmingham, UK;(2) Department of Mechanical Engineering, The University of Hong Kong, Pokfulam Road, Hofig Kong SAR, P.R. China |
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Abstract: | The origin of the γ fiber recrystallization texture in interstitial-free (IF) steel developed during continuous annealing
has been investigated by scanning electron microscopy (SEM) and orientation imaging microscopy (OIM). Nucleation of {111∼<uvw> oriented crystals occurs in deformation banded γ grains and therefore a comprehensive study of microstructure of cold-rolled
IF steel in the sections perpendicular to the rolling and transverse directions (TDs) and the rolling plane (RP) has been
carried out to understand the formation, geometry, and microstructural features of recrystallization. The RP section gave
abundant evidence of orientation gradients formed in γ oriented grains that had been subject to orientation splitting to give
deformation bands. These orientation gradients across a single grain are around 5 to 30 deg and this orientation difference
is sufficient to form nuclei with mobile interfaces during annealing and hence to create chains of γ oriented new grains in
the original hot band γ grain envelopes. A grain impingement model requiring orientation pinning is then proposed to explain
how these grains, contained in deformed γ grain envelopes, grow out into their neighbors to dominate the final recrystallization
texture of IF steel. The α deformed grains contain only small lattice curvatures, and therefore in-grain nucleation is rare.
These grains are mostly consumed by invading γ grains toward the end of the recrystallization process. |
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