Effect of strain on recrystallisation-precipitation interaction in low vanadium microalloyed steel

Using torsion tests and applying the 'back extrapolation' method in isother mal conditions, recrystallisation-percipitation-time temperature (RPTT) dia grams have been determined for a microalloyed steel with 0.35%C, 0.033%V, a nd 121 ppm N. The RPTT diagrams provide abundant information about the recr ystallisation-precipitation interaction, Data such as the minimum incubatio n time for precipitates and the corresponding recrystallisation, the temper ature for the minimum incubation time, and the time necessary for recrystal lisation to be completed are deduced from the RPTT diagrams. The present st udy is completed,vith the determination of the activation energy for recrys tallisation before and after precipitation, arriving at a new concept of th e phenomenon that establishes discontinuous variation both in the derived f unction to, against the inverse of the temperature and in the function itse lf, where t(0.5) is the time corresponding to a 50% recystallised volume fr action.