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By using torsional test, microstructural changes in commercially available C-Mnand vanadium microalloyed\udsteel were studied and changes in austenite on rolling through roughing and finishing mills were\udestimated on the basis of preliminary static recrystallization determinations. Amethodfor determining the\udtemperature at which recrvstaflization starts to be inhibited in microalloyed steel involving experimenta]\udmeasurementsof the activation energy wasdeveloped. The influenoe of the activation energy on changes\udin austenite brought about by rolling at an ordinary hot strip mill wasestablished by torsional simulation\udof various thermal cycles, both at a roughing and at a finishing mill, Austenite in C-Mnsteel wasfound to\udbe impossible to harden under these conditions-not even on rolling at a finishing mill at temperatures\udclose to Ar3-as a result of its activation energy being constant at all temperatures. Onthe other hand.\udhardening of austenite in microalloyed steel wasreadily accomplished at a finishing mill at temperatures\udbelbw the critical recrystallization temperature (915 ºC) as the activation energy increases sharply below\udsuch a temperatute.The authors are grateful for the financiai support of\udthe DGICYT-Spain(Project PB89-0022).Peer reviewe

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Static Recrystallization in Austenite and Its Influence on Microstructural Changes in C-Mn Steel and Vanadium Microalloyed Steel at the Hot Strip Mill.