ND//<111> Recrystallization in Interstitial Free Steel: The Defining Role of Growth Inhibition

概要

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Hot band, fully recrystallized, interstitial free (IF) steel samples were cold rolled to 10–80% thickness reductions. After characterizing the developments in deformed microstructures, 50–80% deformed samples were fully recrystallized at 650°C. Though different annealing times were used, use of a relatively lower annealing temperature and repeated trials ascertained absence of significant post-recrystallization grain coarsening. Recrystallization brought in a steady improvement in γ-fibre (ND//<111>) and drop in θ-fibre (ND//<100>). The only exception was 80% prior deformed microstructure, where the trend was reversed: enforcing a drop in texture estimated normal anisotropy or r value. The study brought out growth inhibition of recrystallized γ-fibre grains, caused by non-γ fibre bands and by orientation pinning of recrystallized γ-γ boundaries, as the mechanism behind the observed trend reversal.
The Iron and Steel Institute of Japanの論文