Effect of Mo Concentration on Dynamic Recrystallization Behavior of Low Carbon Microalloyed Steels

Using a Gleeble 3500 thermo‐mechanical simulator, the dynamic recrystallization (DRX) behavior and mechanical properties of four low C, Nb−Ti‐containing micro‐alloyed steels with a Mo content ranging from 0 to 0.27 wt% were investigated. The effects of Mo content, deformation temperature and strain rate on the DRX parameters were quantified. The flow curves showed the typical signs of DRX over a wide range of deformation conditions. However, at higher strain rates (5 s−1) and/or lower deformation temperatures (below 1000°C), dynamic recovery was observed. It was shown that Mo has an effect on retarding DRX in micro‐alloyed steels, most likely due to the solute drag. Dynamic recrystallization (DRX) and mechanical properties of microalloyed Nb–Ti‐steels with different Mo contents are investigated, and the effects of Mo, deformation temperature and strain rate quantified. The typical signs of DRX are observed over a wide range of deformation conditions, but at higher strain rates and/or lower deformation temperatures, dynamic recovery occurred. It is shown that Mo has a retarding effect on DRX.