Modelling austenite flow curves in low alloy and microalloyed steels

• Published in: Acta materialia Vol. 44; no. 1; pp. 155 - 163
• Main Authors: Hernandez, C.A., Medina, S.F., Ruiz, J.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.01.1996; Elsevier Science
• Subjects: Applied sciences; Elasticity. Plasticity; Exact sciences and technology; Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology; Metals. Metallurgy; Hardening; Temperature dependence; Dynamical recovery; Temperature range 1000-4000 K; Microalloyed steel; Austenite; Mechanical properties; Dynamical recrystallization; Low alloy steel; Modeling; Flow stress
• ISSN: 1359-6454; 1873-2453
• DOI: 10.1016/1359-6454(95)00153-4

A model has been developed to predict the austenite flow curves of low alloy and microalloyed steels. The model consists basically of two expressions for stress, as a function of strain, temperature, strain rate and the chemical composition of the steel. The first predicts the hardening and dynamic recovery region and the second predicts the softening caused by dynamic recrystallization, the algebraic sum of both expressions predicting the complete flow curve. The model's different parameters are a function of the dimensionless parameter ZA of Sellars and Tegart's equation, which in turn has been modelled not only as a function of temperature and strain rate but also as a function of the chemical composition. In this way one single model may be applied to any hot deformed steel whose composition is the same as or similar to those studied.