A Modified Johnson-Cook Model Incorporating the Effect of Grain Size on Flow Stress
The mechanical properties of steel are influenced by grain size, which can change through mechanisms such as nucleation and growth at elevated temperatures. However, the classic Johnson-Cook model that is widely used in hot deformation simulations does not consider the effect of grain size on flow stress. In this study, the Johnson-Cook model was modified to incorporate the effects of austenite grain size on flow stress. A finite element model was employed to characterize the effects of grain size on the flow stress for different steel grades over a range of temperatures (900⁰ to 1300⁰). Simulation results show good agreement with experimental observations.
S. Ganguly et al., "A Modified Johnson-Cook Model Incorporating the Effect of Grain Size on Flow Stress," AIST Technology Magazine, Association for Iron & Steel Technology (AIST), Oct 2021.
Materials Science and Engineering
Mechanical and Aerospace Engineering
Peaslee Steel Manufacturing Research Center
Second Research Center/Lab
Center for High Performance Computing Research
Keywords and Phrases
Johnson-Cook Model; Thermo-mechanical characterization; Prior-austenitic grain size; Finite-Element model
Article - Journal
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