Determination of activation energy for static recrystallization using multipass continuous cooling torsion test

Abstract

Two microalloyed steels (Nb low carbon and V medium carbon) were tested by means of multistage continuous cooling torsion with aim to evaluate the interpass recrystallization data, by means of Tnr (temperature of no-recrystallization) temperatures. In the region of short interpass intervals, i.e. region where the static recrystallization is governed by the presence of alloying elements in solid solutions, interpass time was varied between 1.8, 2.7, 5 and 10s. Since the recrystallization fraction on Tnr temperature is constant, it was possible to plot lnt-1/T dependence (where t is interpass time and T obtained Tnr temperature) and calculate the slopes representing QSRX, i.e. activation energy for static recrystallization. QSRX values were determined for both low carbon Nb and medium carbon V microalloyed steels and previously reported steels. Calculated values are very close and show good agreement with previously published data estimated after employment the traditional procedure.