Iron & Steel Society of Iran International Journal of Iron & Steel Society of Iran 2981-0388 13 2 2016 12 01 Exponential-type Constitutive Equation in Order to Use in Modeling the Warm Deformation of a Eutectoid Steel Exponential-type Constitutive Equation in Order to Use in Modeling the Warm Deformation of a Eutectoid Steel 13 18 23708 EN M. Rakhshkhorshid Department of Mechanical and Materials Engineering, Birjand University of Technology, South Khorasan, P.O. Box 97198-66981, Iran H. Rastegari Department of Mechanical and Materials Engineering, Birjand University of Technology, P.O.Box: 97175-569, Birjand, Iran Journal Article 2017 01 16 The main contribution of the present work is to investigate the capability of exponential-type constitutive equation<br />to model the warm deformation flow curves of a eutectoid steel in the temperature range of 620-770 °C and<br />at the strain rates in the range of 0.01-10 s^-1 conducted on a Gleeble-1500 thermomechanical simulator. Warm<br />deformation in this temperature range facilitates the occurrence of dynamic spheroidization of cementite lamellae<br />as a softening process as well as some instabilities and microstructural defects. The prediction capability of the<br />examined model was assessed using the average absolute relative error (AARE) criterion. The obtained AARE<br />with the value of 7.39% for warm deformation modeling of the tested steel showed the acceptable performance of<br />the examined model. https://journal.issiran.com/article_23708_b3f2a6b3e119aaa5a1326802e7b49403.pdf