Interactions Between Dynamic Softening and Strengthening Mechanisms During Hot Forging of a High-Strength Steel

Open-die forging is a critical step in the manufacture of large numbers components used transportation and energy industries. Dynamic recrystallization, dynamic transformation, precipitation take place during hot deformation process significantly affect microstructure conditioning, which ultimately influences service properties component. In present work, using Gleeble 3800 thermomechanical simulator, open-die large-size ingot made modified AISI 6140 medium carbon high-strength steel investigated. Deformation temperatures ranging from 950°C to 1,250°C strain rates 0.01 1 s −1 , representative actual process, are considered analysis. The generated true stress–true curves as basis for development constitutive model predicting occurrence softening strengthening phenomena function conditions. corresponding activation determined be about 374 kJ mol compared against values reported literature other steels. recrystallization kinetics studied t 50 model, influence temperature rate quantified discussed. interaction between discussed, conditions under such interactions occur determined. results validated by examination, including laser confocal microscopy, field emission scanning electron transmission energy-dispersive spectroscopy. study focuses on reproducing cycle applied vanadium-containing industry with special attention processes.