Effect of Deformation on Microstructure and Recrystallization of Low Carbon Cold Rolled Sheet

Simulated bell-type furnace annealing test of cold rolled sheet with different reduction ratio was carried out under different temperatures.The results show that strain hardening effect and dislocation density increase as cold reduction increases.the recrystallized grain size is much finer and uniform after annealing at 650℃ for 4 h.Recrystallization driving force as function of deformation was derivated and then being used to calculate value of recrystallization driving force.Calculation shows that when cold reduction increases from 52% to 80%,recrystallization driving force produced by the dislocation density increased by 1.4×10⁴J/m²,and both starting and complete recrystallization temperature decrease at 20~40℃.