Study of Recrystallization and Phase Transformation in a Cold-Rolled Dual-Phase Steel: Influence of Temperature and Heating Rate during First Annealing Stages

Abstract

The effect of heating path and heating rate on the microstructure and texture development in cold-rolled continuously annealed DP steel was studied by SEM and EBSD. A methodology to separate the individual phases present in mixed microstructures, and thus to enable quantification of the individual contributions to the bulk texture has been applied. It was observed that a higher heating rate may promote strengthening of {111} textures in DP steels as observed in low carbon grades.

Effect of heating rate on nucleation and growth of austenite in cold rolled dual phase steel

“…The formation of austenite in the intercritical region has been widely investigated for hot rolled and cold-rolled steels. [11][12][13][14][15] Huang et al 16 suggested a strong interaction between ferrite recrystallisation and austenite formation occurred with heating rates from 1 to 100 K s 21 , which would cause a striking morphological evolution of martensite from a randomly distribution to a band structure. Mohanty et al 17 reported that a higher heating rate will lead to more austenite when annealing at a lower intercritical temperature.…”