Some aspects of physical metallurgy of microalloyed steels

  • Nenad Radović Faculty of Technology and Metallurgy
  • Goran Vukicevic HBIS GROUP Iron and Steel d.o.o. Serbia, Hot Strip Mill, Smederevo, Serbia
  • Dragomir Glišić Department of Metallurgical Engineering, Faculty of Technology and Metallurgy, University of Belgrade, Serbia
  • Stefan Dikić Department of Metallurgical Engineering, Faculty of Technology and Metallurgy, University of Belgrade, Serbia
Keywords: microalloyed steels, deformation, recrystallization, precipitation, Boratto test

Abstract

Some aspects of deformation, precipitation, and recrystallization behavior in medium carbon V-microalloyed and low carbon Nb/Ti-microalloyed steels are presented in the paper. Changes in microstructure are explained together with methods of quantification. The temperature of No-recrystallization (Tnr) is defined as a milestone to show the onset of retardation of recrystallization while the apparent activation energy for hot working shows the extent of this retardation. In the case of high cooling rates, this method is not sufficiently sensitive and Trl (recrystallization limit temperature) and Trs (recrystallization stop temperature) must be evaluated from softening data. Paper presented the possibility to estimate Tnr temperature on six stands finishing train at Hot Strip Mill in HBIS Iron and Steel Serbia, Smederevo as well as the activation energy for static recrystallization, QSRX, derived from Tnr temperatures.

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Published
2020-01-14
Section
Djordje Drobnjak - Memorial Issue