Aspects of Orientation-Dependent grain growth in extra-low carbon and interstitial-free steels during continuous annealing |
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Authors: | J L Bocos E Novillo M M Petite A Iza-Mendia I Gutierrez |
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Affiliation: | (1) Fundacion CETENASA, Noain, C.P. 31110 Navarra, Spain;(2) CEIT and TECNUN (University of Navarra), 20018 Donostia-San Sebastain, Basque Country, Spain |
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Abstract: | The present work concentrates on the application of orientation imaging microscopy (OIM) based on the electron backscattered
diffraction (EBSD) technique to the investigation of the microstructural evolution of an extra-low carbon (ELC) steel and
a Ti-Nb-bearing interstitial-free (IF) steel, during continuous annealing. Aspects like the nucleation, the evolution of the
recrystallized volume fraction and grain size of grains with different orientations, the interface area limiting recrystallized
{111} regions, and the apparent growth rates have been considered. Different criteria have been applied in order to identify
crystallites produced during annealing. During the first stages of annealing, a network of grain boundaries with misorientations
higher than 10 deg is produced, mainly inside the deformed γ-fiber grains. The crystallites formed within this network, free
from cells or subgrains at their interiors, can be considered as potential nuclei. However, among all, only some of them become
effective due to an improtant selection. The {111} recrystallized grains have a significant size and number advantage as compared
with other texture components, and a hard impingement between clusters of {111} grians is produced during grain growth. The
effect of grain growth behind the recrystallization front seems to be negligible as compared with the grain coarsening produced
by the migration of this front, driven by the cold-work stored energy.
J.L. Bocos, formerly Researcher with CEIT |
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