High Temperature Hot Deformation Behavior and Constitutive Model Construction of High Quality 51CrV4 Spring Steel
In order to investigate the hot deformation behavior of alloy 51CrV4, the single pass compression experiments were carried out in deformation temperature range of 800 –1120 °C and strain rate range of 0.01–10 s−1. And the deformation amount of all the samples was 50%. The results showed that the steady flow behavior was observed at deformation with low temperature and high strain rate, where the dynamic recovery mechanism was dominated. Meanwhile, the formation of dislocation cell structures and polygonal characteristics further supported the mechanism of dynamic recovery. The dynamic recrystallization (DRX) phenomenon of alloy occurred with the increase of strain. With the increase of deformation temperature and decrease of strain rate, the peak stress gradually decreased due to DRX. Finally, the hot deformation constitutive equation was established and the thermal deformation activation energy was calculated as 367.87 kJ/mol.
Keywords51CrV4 spring steel Dynamic recrystallization Constitutive equation Activation energy
This work was financially supported by china postdoctoral science foundation (No. 2016M592101).