Predication of Hot Flow Behavior of Micro-Alloy Steel Using Modified Johnson-Cook Model

Document Type : Original Articles

Authors

• Hamid Ahmadi ¹
• Hamidreza Rezaei Ashtiani ²
• Mohamad Heidari ¹

¹ Department of Mechanical Engineering, Aligudarz Branch, Islamic Azad University, Aligudarz, Iran.

² School of Mechanical Engineering, Arak University of Technology, Arak, Iran.

10.22067/jmme.2021.67108.0

Abstract

Constitutive models can be used as a powerful tool to predict the complex behavior of materials under different deformation conditions. These equations can model and control the flow behavior of materials with appropriate accuracy by considering the parameters affecting the behavior of the material. In this study, a modified Johnson-Cook model has been developed to predict the hot working behavior of L80 micro alloy steel at various deformation parameters such as temperature, strain rate, and strain. In order to develop this model, experimental data related to hot compression tests at a temperature range of 1173-1373 K and strain rates of 0.001-1 s^-1 have been used. The results of the microstructure correctly describe the flow behavior of the material. The results show that the developed model, taking into account the softening effects of temperature as well as strain and strain rate hardening, provides a good prediction of the hot working behavior of micro-alloy steel and this developed model can be used to simulate the production processes of this steel at high temperatures.

Keywords

• Constitutive equation
• Modified Johnson-Cook model
• hot deformation
• Flow stress
• Microstructure

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