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Simulation of Static Softening during Annealing of Cold Rolled Strip Using Cellular Automata and Finite Element Model

Seyed Salehi, Majid | 2013

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  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 45184 (07)
  4. University: Sharif University of Technology
  5. Department: Material Science & Engineering
  6. Advisor(s): Serajzadeh, Siamak
  7. Abstract:
  8. In this study, static softening kinetics and microstructural evolution during isothermal and non-isothermal annealing of aluminum-magnesium alloy and low carbon steel after cold plastic deformation was investigated. It is known that in industrial cold forming processes, the material properties and microstructure changes during the annealing depends on the inhomogeneous initial microstructure and the deformation history of the cold worked material. To predict the microstructural changes during the annealing of cold worked alloys, a multiscale model based on probabilistic cellular automata (at mesoscale), and the finite element method (at macroscale), was used. To do so, a two-dimensional rigid plastic finite element model has been developed to assess strain and stress fields and stored energy accumulation during cold rolling as well as initial condition of mesoscopic model. Then, the cellular automata scheme has been employed to predict the initiation of new strain free grains and the progress of new grain boundaries within the deformed microstructure during static recrystallization. A recovery model was also applied to simultaneously take into account the effects of dislocation annihilation and rearrangement during annealing. A combination of superconvergent patch recovery and bi-cubic spline approaches was used to link the mesoscale microstructure and macroscale deformation models. The model predictions were compared with experimental observations and a good agreement was found between the results
  9. Keywords:
  10. Multiscale Modeling ; Cellular Automata ; Finite Element Method ; Isothermal Anealing ; Nonisothermal Anealing ; Static Recrystallization ; Static Recovery

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