Modelling and simulation of dynamic recrystallisation based on multi-phase-field and dislocation-based crystal plasticity models

The mechanical properties of metals used as structural materials are significantly affected by hot (or warm) plastic working. Therefore, it is industrially important to predict the microscopic behaviour of materials in the deformation process during heat treatment. In this process, a number of nucle...

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Bibliographic Details
Published in:Philosophical magazine (Abingdon, England) England), 2020-08, Vol.100 (16), p.2106-2127
Main Authors: Kujirai, Sho, Shizawa, Kazuyuki
Format: Article
Language:English
Subjects:
dislocations
Multi-phase-field model
numerical simulation
phase transitions
plasticity of metals
recrystallization
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Summary:The mechanical properties of metals used as structural materials are significantly affected by hot (or warm) plastic working. Therefore, it is industrially important to predict the microscopic behaviour of materials in the deformation process during heat treatment. In this process, a number of nuclei are generated in the vicinity of grain boundaries owing to thermal fluctuation or the coalescence of subgrains, and dynamic recrystallisation (DRX) occurs along with the deformation. In this paper, we develop a DRX model by coupling a dislocation-based crystal plasticity model and a multi-phase-field (MPF) model through the dislocation density. Then, the temperature dependence of the hardening tendency in the recrystallisation process is introduced into the DRX model. A multiphysics simulation for pure Ni is conducted, and then the validity of the DRX model is investigated by comparing the numerical results of microstructure formation and the nominal stress-strain curve during DRX with experimental results. The obtained results indicate that in the process of DRX, nucleation and grain growth occur mainly around grain boundaries with high dislocation density. As deformation progresses, new dislocations pile up and subsequent nucleation occurs in the recrystallised grains. The influence of such microstructural evolution appears as oscillation in the stress-strain curve. From the stress-strain curves, the temperature dependence in DRX is observed mainly in terms of the yield stress, the hardening ratio, and the change in the hardening tendency after nucleation occurs.
ISSN:1478-6435
1478-6443
DOI:10.1080/14786435.2020.1756501