Influence of the Temperature of High Pressure Torsion Deformation on the Recrystallization Kinetics of Iron with a Submicrocrystalline Structure

The kinetics of recrystallization of pure iron deformed by high pressure torsion at 20 and 250°C has been studied in the course of annealing at 450°C. The change in grain size upon annealing at 450°C does not obey the law of normal grain growth, either in iron with an SMC structure formed at 20°C or in iron with a dynamically recrystallized structure formed at 250°C. This is because new thermally activated recrystallization centers appear upon annealing. The study has also established the influence of deformation temperature on the annealing texture. In the course of annealing, after deformation at 20°C, the material develops a sharper texture with a predominance of two components, {110}〈111〉 and {110}〈001〉. Similarly, after deformation at 250°C, a sharper texture with a predominance of three components, such as {110}〈111〉, {110}〈001〉, and {112}〈111〉, is formed.