Effect of Annealing Processes on Microstructure and Recrystallization Texture of a Cold-rolled High Strength IF Steel

A cold-rolled high strength IF steel was annealed at two different heating rate to study the evolution of microstructure and recrystallization texture of IF steels. The results show that the γ-fier（{111} or（ND‖＜111＞）） of IF steel form at both of two recrystallization annealing processes.When the samples are heated at fast rate of 350 ℃/min,the recrystallization grains grow from the merging of subgrains and show equiaxed morphology.The orientation of recrystallization grains was consistent with the surrounding deformation matrix.When the samples are heated at slow rate of 2 ℃/min,the new grains grow from grain boundary bowing,showing pancake grains along the rolling direction with weak orientation to the deformed grains.The density of γ-{111} orientation of the samples with slow heating rate are stronger than that with fast heating rate.The results are of great significance to improve the deep drawability of the thin sheet.