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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

AuthorsMedina, Sebastián F.; López, Víctor
KeywordsStatic recrystallization
Activation energy
Hot strip mill
Roughing mill
Finishing mill
Critical recrystallization temperature
Austenite grain
Strain induced precipitation
Ferrite grain
Issue Date1993
PublisherIron and Steel Institute of Japan
CitationISIJ International 33 (5) : 605-614 (1993)
AbstractBy using torsional test, microstructural changes in commercially available C-Mnand vanadium microalloyed steel were studied and changes in austenite on rolling through roughing and finishing mills were estimated on the basis of preliminary static recrystallization determinations. Amethodfor determining the temperature at which recrvstaflization starts to be inhibited in microalloyed steel involving experimenta] measurementsof the activation energy wasdeveloped. The influenoe of the activation energy on changes in austenite brought about by rolling at an ordinary hot strip mill wasestablished by torsional simulation of various thermal cycles, both at a roughing and at a finishing mill, Austenite in C-Mnsteel wasfound to be impossible to harden under these conditions-not even on rolling at a finishing mill at temperatures close to Ar3-as a result of its activation energy being constant at all temperatures. Onthe other hand. hardening of austenite in microalloyed steel wasreadily accomplished at a finishing mill at temperatures belbw the critical recrystallization temperature (915 ºC) as the activation energy increases sharply below such a temperatute.
Publisher version (URL)http://dx.doi.org/10.2355/isijinternational.33.605
Appears in Collections:(CENIM) Artículos
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