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Simulation of Static Softening during Annealing of Cold Rolled Strip Using Cellular Automata and Finite Element Model
, Ph.D. Dissertation Sharif University of Technology ; Serajzadeh, Siamak (Supervisor)
Abstract
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...
Effect of Final Annealing on Microstructure and Mechanical Properties of Severely Deformed AA 2024-O
, M.Sc. Thesis Sharif University of Technology ; Kazeminezhad, Mohsen (Supervisor)
Abstract
Aluminum alloys have became one of the most important metals in industries because of its good corrosion resistance and good machinability and high strength to weight ratio. But its properties are still in need to be improved for essentials affairs.in previous researches the effect of various factors before, between and after the multidirectional forging process has been investigated. But there is a gap between the effect of the isothermal final annealing and the effects of heating time between these studies. In this research the main focus is on microstructure improvement using severe plastic deformation and final annealing. First specimen deforms by 4pass of multi directional forging then...
The correlation of stir zone texture development with base metal texture and tool-induced deformation in friction stir processing of severely deformed aluminum
, Article Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science ; Volume 48, Issue 1 , 2017 , Pages 188-197 ; 10735623 (ISSN) ; Kazeminezhad, M ; Miyashita, Y ; Kokabi, A. H ; Sharif University of Technology
Springer Boston
2017
Abstract
The texture development during friction stir processing (FSP) of 1050 aluminum severely deformed at the strain magnitude of 2.32 was comprehensively discussed. It was observed that the component B¯ of the ideal shear texture along with the cube texture was developed in the severely deformed base metal. The effects of base metal texture on the texture development of stir zone, thermo-mechanically affected zone, and heat-affected zone during FSP were examined. Also, the developed texture components in the vicinity of the FSP tool and the stir zone were correlated to the deformation induced by the rotating tool which consisted of pin and shoulder. The observed texture components in the...
Theoretical and Practical Study of Softening Kinetics after Deformation at Elevated Temperature in an Aluminium Alloy
, M.Sc. Thesis Sharif University of Technology ; Serajzadeh, Siamak (Supervisor)
Abstract
In this study, behavior of softening after hot tensile and hot rolling processes in isothermal and non-isothermal conditions in AA5083 Aluminium alloy has been simulated using cellular automata. Also effect of temperature and strain rate in hot tensile test and effect of temperature and strain in hot rolling has been investigated. First distribution of temperature in material using the finite element method computed and used as initial temperature in CA and computing the static recovery in hot tensile. Also for hot rolling, computing static recovery and CA are used for initial temperature in ABAQUS. For investigating effect of dynamic recovery and recrystallization, the neural network has...
The Effect of Strain path on Static Recrystallization Kinetics after Strip Cold Rolling by Cellular Automata and Finite Element Method
, M.Sc. Thesis Sharif University of Technology ; Serajzadeh, Siamak (Supervisor)
Abstract
Softening behavior containing static recovery and static recrystallization in isothermal and non-isothermal conditions in aluminum 1050 after cold rolling has been simulated using Cellular Automata(CA). The effect of strain pass on recrystallization process has been investigated. The finite element method was employed to simulate 1,2 and 3 pass rolling processes and compute the stored energy distribution and transferred to the CA model. For the initial microstructure the topologic deformation and site-saturated nucleation has been considered. For non-isothermal conditions the thermal model has been utilized to compute temperature distribution and decreasing in stored energy due to...
Softening Kinetics Prediction of Cold Worked Aluminum Alloy
, M.Sc. Thesis Sharif University of Technology ; Serajzadeh, Siamak (Supervisor)
Abstract
In this work, annealing procedure of cold-deformed AA5052-SiC composite has been simulated by using cellular automata approach and the effect of SiC second phase on softening kinetics has been studied. To do so, site saturated nucleation has been employed to establish initial microstructure. In addition, topological changing due to deformation has been implemented on the microstructure. During annealing, recovery and recrystallization phenomena occur simultaneously, and it has strong effect on the annealed microstructure. Therefore, during annealing, recrystallization and recovery has been considered simultaneously and decreasing in the stored energy, which has developed during deformation...
Simulation of static softening behavior of an aluminum alloy after cold strip rolling
, Article Computational Materials Science ; Volume 69 , 2013 , Pages 53-61 ; 09270256 (ISSN) ; Serajzadeh, S ; Sharif University of Technology
2013
Abstract
In this work, softening kinetics after cold rolling has been simulated using a coupled finite element-cellular automata model. Firstly, a two-dimensional rigid plastic finite element analysis has been developed to assess strain field and the stored energy accumulation during cold rolling as well as the initial condition of the mesoscopic model. Then, the cellular automata scheme has been employed to calculate the progress of static recrystallization at a given temperature while a dislocation-base model was simultaneously utilized to consider the effect of recovery on static softening process and final microstructures. The model has been examined on isothermal annealing of cold rolled AA5052...