Heavy forgings usually undertake multi-hit deformation during the final forging. In these processes, initial grain size of steels depends on the heating temperature and heating time, and its evolution is affected by dynamic recovery, dynamic recrystallization, static recrystallization and grain growth. In order to control the grain size of heavy forgings, an overall approach on modeling the grain evolution of steel during hot forming is conducted and the model covers three different stages: the grain growth during heating, dynamic recrystallization (DRX) during hitting, and meta-dynamic (MDRX) and static recrystallization (SRX) during hitting intervals. In applications, experiment-based phenomenological models, as easy ways to characterize the grain evolution, are established for the process of heating and single-hit, while the Cellular Automaton (CA) simulations are applied for tracing more complex recrystallization process during multi-hit deformations. Taking the FEM simulated temperature and deformation information as the inputs of the CA model, the grain evolution of steel is predicted. And in turn, the working parameters are accessed and improved according to the predicted grain evolutions.
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- An Overall Simulation of Austenite Grain Evolution for Heavy Forgings During Heating and Hot Deformation
- Springer International Publishing
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