Physically based modeling and characterization of hot deformation behavior of twinning-induced plasticity steels bearing vanadium and niobium

摘要: Abstract In the present work, hot deformation behavior of four TWIP steels is studied by conducting compression tests at strain rates in range 0.01–5/s and temperatures 950–1100 °C using a Gleeble thermomechanical simulator. The differed with respect to their chemical compositions. They were non-microalloyed, Nb-microalloyed, V-microalloyed high-Al V-microalloyed. microstructural evolutions are scanning electron microscope (SEM) equipped backscattered diffraction (EBSD) detector. Also, modeled dislocation density based Bergstrom diffusional transformation Kolmogorov-Johnson-Mehl-Avrami models. peak stresses variant occurred higher strains than variant. microstructure Nb-microalloyed showed that dynamic recovery was more active recrystallization (DRX) when steel deformed lower temperatures, i.e. 1000 °C. modeling as Zener–Hollomon parameter (Z) increases, hardening for increases clearly rate others. Finally, it seen increased leads decreased Avrami exponents (nA) variants suggesting occurrence nucleation on grain twin boundaries.