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," Proceedings of the AISTech 2020 (2020, Cleveland, OH), pp. 1614-1621, Association for Iron & Steel Technology (AIST), Sep 2020.
The definitive version is available at https://doi.org/10.33313/380/174
AISTech 2020 (2020: Aug. 31-Sep. 3, Cleveland, OH)
Materials Science and Engineering
Mechanical and Aerospace Engineering
Peaslee Steel Manufacturing Research Center
Keywords and Phrases
Johnson-Cook Model; Thermo-mechanical characterization; Prior-austenitic grain size; Finite-Element model
Article - Conference proceedings
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03 Sep 2020