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E. Sobotka, J. Kreyca, E. Povoden-Karadeniz:
"Recrystallization simulation and double-hit compression tests of microalloyed steel";
Talk: Online Conference STEELSIM 2021, Vienna; 2021-10-05 - 2021-10-07; in: "The 9th International Conference on Modeling and Simulation of Metallurgical Processes in Steelmaking", (2021), ISBN: 978-3-200-07994-6; 522 - 529.

Temperature dependent, strain induced precipitation of (Ti,Nb,V)(C,N) MX carbonitrides can retard static
recrystallization. Predicting the role of microalloying elements on the recrystallization behavior by
thermokinetic simulation is expected to support the technological process optimization and cost reduction
of steel development. In this study, we evaluate the simulative predictability of recrystallization modeling
for the effect of Ti, Nb, and V microalloying on recrystallization kinetics. Isothermal double-hit
compression tests are performed on a Gleeble 3800 thermo-mechanical simulator to investigate the
microstructure evolution related to static recrystallization kinetics of microalloyed steel. By determination
of the recrystallized fraction of austenite using the 5 % true strain method at different strains, strain rates
and temperatures the static recrystallization critical temperature (SRCT) is derived for the studied
microalloyed steel grade. A recrystallization model, recently implemented into the simulation software
toolbox MatCalc, is used to reproduce the experimentally determined SRCT-values. In addition, the
softening fractions are evaluated as a function of time by adapted Avrami equations. Results from the
MatCalc recrystallization model and the Avrami model are subsequently compared and their predictive
power is assessed.

recrystallization, microalloyed steel, thermomechanical treatments, steel properties