EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

We present a full-field model to study Dynamic Recrystallization (DRX) by sequentially coupling a large-deformation full-field crystal plasticity framework (DAMASK) [[1]] and a cellular automata framework (CASIPT) [[2]]. The coupling is flexible in the sense that the hot deformation simulation in DAMASK is continuously monitored and triggers the switch to CASIPT only when the dislocation density reaches a threshold value. This reduces the computational load involved in the coupling as compared to models switching in each and every time-step. A regridding procedure is used to map the deformed microstructure from DAMASK to a regular grid as needed by CASIPT. This framework enables simulation of microstructure evolution in three dimensions during hot-rolling, especially for the very large deformations in the case of multi-stand hot rolling commonly seen in industry. Such a generalized setup allows studying DRX under systematically varying boundary conditions which are difficult to achieve using experiments and can be used for process optimization.

References:

1. DAMASK overview

2. Cellular Automata descripton