Effect of V and C on the Hot Flow Behavior of V Microalloyed Steels
The compressive deformation behaviors of a C-Mn steel (0.36C-1.42Mn) and two V microalloyed steels (0.37C-1.46Mn-0.089V and 0.055C-1.45Mn-0.080V) were investigated at the temperatures from 900 °C to 1100 °C and strain rates from 0.005 s−1 to 10 s−1 on Gleeble-1500 thermo-mechanical simulator. It was found that V addition in steels can effectively increase the flow stress, and C addition in V microalloyed steels generates a softening effect at lower strain rates, whilst at higher strain rates C addition leads to higher flow stress. The flow stress constitutive equations were developed, results showed that V has little effect on Q value, while C addition has the trend to reduce the Q value. Characteristic points of flow curves were analyzed. It showed that V addition can delay or promote the occurrence of dynamic recrystallization as the deformation conditions changed, while C addition can promote the occurrence of dynamic recrystallization.
V microalloyed steels; hot deformation; constitutive equations; dynamic recrystallization
Hailian Wei (1), Guoquan Liu (1,2)
(1) School of materials science and engineering, University of Science and Technology Beijing,, Beijing 100083,China
(2) State Key Laboratory for Advanced Metals and Materials, University of Science and Technology, Beijing, Beijing 100083,China
Vanadium Microalloyed Steels: A Symposium in Memory of Michael Korchynsky, MS&T14, 12-16 October 2014, Pittburgh, PA, USA.