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.