Hot deformation behavior of a medium carbon microalloyed steel

• Published in: Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 528; no. 10; pp. 3876 - 3882
• Main Authors: Mirzadeh, H., Cabrera, J.M., Prado, J.M., Najafizadeh, A.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 25-04-2011; Elsevier
• Subjects: Activation energy; Applied sciences; Carbon; Cold working, work hardening; annealing, quenching, tempering, recovery, and recrystallization; textures; Constitutive equations; Constitutive modeling; Constitutive relationships; Cross-disciplinary physics: materials science; rheology; Data processing; Deformation; Dynamic recovery; Dynamic recrystallization; Elasticity. Plasticity; Exact sciences and technology; High strength low alloy steels; Hot working; Materials science; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Physics; Strain hardening; Strain rate; Structural steels; Treatment of materials and its effects on microstructure and properties; Hot working; Dynamic recrystallization; Dynamic recovery; Activation energy; Constitutive modeling; Strain hardening; Hot deformation; Constitutive equation; Dynamical recovery; Work hardening; Medium carbon steel; Dynamical recrystallization; Compression test; Microalloyed steel; Viscoplasticity; Power law; Zener Hollomon parameter; Flow stress; Strain rate
• ISSN: 0921-5093; 1873-4936
• DOI: 10.1016/j.msea.2011.01.098

► Hot compression test under a wide range of temperature and strain rate. ► A step-by-step procedure for data analysis in hot deformation. ► Critical discussion on the application of constitutive equations.
The hot deformation behavior of a medium carbon microalloyed steel was studied using the hot compression flow curves corresponding to the temperature range of 850–1150
°C under strain rates from 0.0001 to 3
s
−1. A step-by-step procedure for data analysis in hot deformation was also given. The work hardening rate versus stress curves were used to reveal if dynamic recrystallization (DRX) occurred. The application of constitutive equations to determine the hot working constants of this material was critically discussed. Furthermore, the effect of Zener–Hollomon parameter (
Z) on the characteristic points of flow curves was studied using the power law relation. The deformation activation energy of this steel was determined as 394
kJ/mol and the normalized critical stress and strain for initiation of DRX were found to be 0.89 and 0.62, respectively. Some behaviors were also compared to other steels.