Effect of Nb and Mo on Austenite Microstructural Evolution During Hot Deformation in Boron High Strength Steels

• DOI: 10.1007/s11661-022-06618-0
• Publication Date: 2022-02-19T02:06:42Z
• Authors: Irati Zurutuza; Nerea Isasti; Eric Detemple; Volker Schwinn; Hardy Mohrbacher; Pello Uranga
• Keywords: Recrystallization (geology); Microalloyed steel

Abstract This work has focused on the study of hot working behavior boron high strength steels microalloyed with different combinations Nb and/or Mo. The role and Mo during deformation low carbon is well known: both mainly retard austenite recrystallization, leading to pancaked microstructures before phase transformation refined room temperature microstructures. However, design rolling schedules resulting in properly conditioned microstructures, requires microstructural evolution models that take into account effect alloying elements. In this specific case, levels molybdenum (0.5 pct) have recrystallization delay was evaluated. respect, torsion tests were performed investigate four steels, (0.025 combinations. retardation kinetics modeled all cases measured agree those predicted by equations previously developed for Nb–Mo lower concentrations (< 0.3 pct). strain-induced precipitation bearing also characterized. Finally, fractional softening multipass simulations compared MicroSim® model predictions, showing a good agreement experimental results.