Effect of Intercritical Annealing Temperature on Development of Cold Rolled Dual Phase Steel from Q345 Steel

Abstract

Cold rolled dual phase steel was developed from Q345 steel by heat treatment procedure for automotive applications. The ultimate tensile strength was improved about 100MPa higher than the traditional cold-rolled Q345 steel in the continuous annealing simulation experiment. The microstructure presented varied characteristics in different intercritical annealing temperatures; mechanical properties were changed correspondingly as well. The chief discussions are focus on the recrystallization, hardenability of austenite and martensite transformation in the experiment.

Effect of Composition System on Microstructure and Properties of 1000-MPa Grade Cold Rolled DPSteel

“…In industrial production, the change of process will lead to the change of the microstructure characteristics of the dual-phase steel, which in turn determines the performance. Therefore, it is necessary to study the relationship between organization and performance, which is inevitable for the products with better comprehensive performance [2,3]. The mass fraction of ferrite and martensite directly determines the mechanical properties of cold rolled duplex steel.…”