Microstructural and Textural Evolution of Cold Rolled Dual-Phase Steel during Annealing

The microstructural and textural evolution of a cold rolled dual-phase steel were studied by simulating the annealing of hot dip galvanization. The results show that a small amount of recrystallization nucleus appeared nearby the grain boundaries of deformed ferrite when the tested steel was heated to 630 ℃ after the cold rolling, and the deformation microstructure disappeared and recrystallization process completed basically when temperature was above 690 ℃. The fine and dispersive TiC and NbC phases precipitated during recrytallization could promote the nucleation of {111} texture and hinder the nucleation of unfavorable texture, and thus made the density of γ texture reinforced and the textures from {001}〈110〉 to {112}〈110〉 range along α orientation line weaken and even disappear. TiC and NbC phases could hinder the growth of {111} texture and made the density of {001} 〈110〉 texture increased during the growth progress of recrystallization nucleus.