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A Study on Deformation Behavior During Asymmetrical Rolling of Low Carbon Steels and Subsequent Microstructural Phenomena

Seyyed Mortazavi, Navid | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49676 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Serajzadeh, Siamak
  7. Abstract:
  8. In this study, static recrystallization (Rex) of a low carbon steel after cold rolling has bees simulated under non-isothermal condition by employing cellular automata (CA) method. Symmetric cold rolling and asymmetric cold rolling (ASR) which was arisen by inequality of friction coefficient have been applied as primary cold deformation. Residual stress and strain field after deformation, and temperature rate and distribution of specimens during annealing has been evaluated by employing two different models based on finite element method. Initial microstructure has been developed by haphazardly distribution of grains and topological adjustments were imposed on it. Results of FEM models were applied as input of CA model to simulate microstructure and kinetics of static Rex under inhomogeneity of strain and temperatures conditions as the driving force of nucleation and grain growth. To verify the results of three models above, large number of experimental tests such as tensile tests, hardness tests and metallography were used after both “experimental symmetric and asymmetric rolling process under different reductions” and “experimental static recrystallization under different temperature and time conditions”. Both kind of results showed asymmetric cold rolling imposes significant inequality of amount of strain at different surfaces of specimen, as a result grain size through thickness is asymmetric after ASR and after recrystallization. More over increasing kinetics of Static Rex and decreasing in grain size by increasing temperature and pre-strain were observed. In the other hand proper agreement between the results of simulation and experimental tests have been observed. As a result, this model could be employed to predict kinetics of static Rex and grain size after static Rex
  9. Keywords:
  10. Finite Element Method ; Recrystallization kinetics ; Static Recrystallization ; Low Carbon Steel ; Cellular Automata ; Microstructural Refining ; Microstructure Simulation

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