Apparent energy of activation for hot working of vanadium microalloyed steel

摘要

Two-stage linear ln [sinh(ασ)] vs. 1/T plots, based on isothermal continuous and anisothermal multipass torsion curves, indicate the double Q_(HW) behaviour of a V-steel. Above T_(nr), Q_(HW) is independent of all variables but strain. Below T_(nr) (which is interpass time dependent), i.e., in a temperature range in which interpass rccrystallization is supressed, Q_(HW) is not only increased but that based on multipass curves is also interpass time dependent, and only valid for multipass working operations.