MODELING TEXTURE CHANGE DURING THE RECRYSTALLIZATION OF AN IF STEEL

The texture changes taking place during the recrystallization of a Ti and Nb bearing interstitial free (IF) steel were investigated. Samples taken from the hot band of a 0.08%Ti-0.01%Nb IF steel were subjected to cold rolling reductions of 70 and 85%, and annealed at 720-degrees-C to investigate the effect of cold reduction on the recrystallization texture. The main components observed after cold-rolling were the {001}[110] and {112}[110], together with the ND//[111] fiber. After recrystallization, the intensity of the ND//[111] fiber increased, especially between {111}[112] and {111}[123]. Higher cold reductions led to stronger intensities of the latter components. The formation of recrystallization textures in IF steels is discussed in terms of a selective growth theory in which nuclei possessing favorable [110] axis rotation relationships with respect to the deformed matrix undergo preferential growth. By adopting a suitable [110] axis variant selection rule and employing it in conjunction with a nucleus availability factor, it is shown that recrystallization textures can be successfully predicted from experimental rolling textures.