Exponential-type Constitutive Equation in Order to Use in Modeling the Warm Deformation of a Eutectoid Steel

Document Type: Research Paper


1 Department of Mechanical and Materials Engineering, Birjand University of Technology, South Khorasan, P.O. Box 97198-66981, Iran

2 Department of Mechanical and Materials Engineering, Birjand University of Technology, P.O.Box: 97175-569, Birjand, Iran


The main contribution of the present work is to investigate the capability of exponential-type constitutive equation
to model the warm deformation flow curves of a eutectoid steel in the temperature range of 620-770 °C and
at the strain rates in the range of 0.01-10 s-1 conducted on a Gleeble-1500 thermomechanical simulator. Warm
deformation in this temperature range facilitates the occurrence of dynamic spheroidization of cementite lamellae
as a softening process as well as some instabilities and microstructural defects. The prediction capability of the
examined model was assessed using the average absolute relative error (AARE) criterion. The obtained AARE
with the value of 7.39% for warm deformation modeling of the tested steel showed the acceptable performance of
the examined model.


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