STATIC RECRYSTALLIZATION INDUCED PRECIPITATION KINETICS PTT DIAGRAMS

A method developed in the CENIM is described which allows to study the induced precipitation kinetics by the deformation in microalloyed steels. By means of torsion tests the statically recristallized fraction of three microalloyed steels with Nb, V or Ti, has been determined to different temperatures and deformations. When the precipitation begins, the recrystallized fraction is separated of the Avrami's equation and this allows to know, the instant the precipitation begins (P-s) and the instant the precipitation finishes (P-f). Thereby can be traced the Precipitation-Time-Temperature (PIT) diagrams which graphically show the precipitation kinetics.