Modeling the Flow Behavior of a High-Manganese Steel Fe-Mn23-C0.6 in Consideration of Dynamic Recrystallization

In this paper, the hot deformation behavior of a high manganese (23wt. % Mn and 0.6wt. % C) austenitic steel is analyzed. This steel is a ternary Fe-Mn-C alloy that shows twinning induced plasticity (TWIP). Since strip production involves hot rolling, the hot deformation behavior of this steel is analyzed and modeled by a phenomenological material model. The model takes into account strain hardening and softening by dynamic recrystallization (DRX), which is modeled using Avrami type kinetics. The evolution of grain size during DRX is also taken into account. Hot compression tests were performed in a temperature range of 900 to 1200 degrees C and various strain rates from 0.1 s(-1) to 10 s(-1) to identify the model parameters. The material model was coupled with a finite element code and validated using selected parameter combinations of the compression tests that were not used for parameter identification.