Kinetics of Recrystallization and Grain Growth of Cold Rolled TWIP Steel
Hot rolled, laboratory-cast, TWIP steel samples (5.4 mm thick) of 22% Mn - 0.6% C (in mass-%) were cold rolled to different reductions (from 40 % to 70 %) and subsequently isothermally annealed for various times at temperatures ranging from 450º C to 1100º C. The evolution of recrystallization and grain growth was followed by control of the softening kinetics complemented by metallographic, OIM and microtexture observations. A map of the recovery, recrystallization and grain growth in the temperature-time space was obtained. In all instances, the grain size at the end of recrystallization was very fine, D ≤ 2 µm and larger grain sizes were the result of grain growth. A range of grain sizes 2 µm ≤ D ≤ 50 µm was covered by the grain growth experiments. A phenomenological grain growth equation that is useful for the annealing control of this steel was derived from the measurements.
T. Chandra, N. Wanderka, W. Reimers , M. Ionescu
F. de las Cuevas et al., "Kinetics of Recrystallization and Grain Growth of Cold Rolled TWIP Steel", Advanced Materials Research, Vols. 89-91, pp. 153-158, 2010