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Effect of Inter-pass Annealing During Severe Plastic Deformation on Microstructure and Mechanical Properties of Low Carbon Steel

Abdian, Mohammad | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55527 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Kazeminezhad, Mohsen
  7. Abstract:
  8. Low carbon steel is widely used in the automotive industry by improving ductility and minimizing hardness to achieve greater strain. Applying severe plastic deformation to metals and alloys increases strength and decreases ductility. In the process of severe plastic deformation, the pressure is limited in the grooved form. Low carbon steel, after two passes of severe plastic deformation, experiences a rapid drop in strength in addition to ductility, which may indicate the presence of microcracks. Therefore, in this research, annealing between passes during the pressure process in the form of limited grooves has been used so that without a serious decrease in strength, some ductility improvement can be achieved so that more strain can be applied to low carbon steel by increasing the passes of this process. In this study, we used a technique of severe plastic deformation called constrained groove pressing, and the effect of annealing temperature between passes at 300 ° C, 400 ° C, 500 ° C for 20 minutes was investigated. We checked. Regarding the mechanical and microstructural properties of low carbon steel based on the characterization methods used, including hardness and tensile tests, we found that the hardness and strength remain almost constant during the annealing process and the rate of increase in strength decreases with the annealing process. With inter-pass annealing, the amount of elongation decreases as the number of passes increases. By performing inter-pass annealing, as the number of process passes increases, the hard work rate decreases less compared to non-annealing. Also, we were able to process up to four passes for low carbon steel without sample tearing through annealing between passes.
  9. Keywords:
  10. Mechanical Properties ; Microstructure ; Severe Plastic Deformation ; Low Carbon Steel ; Constrained Groove Pressing (CGP) ; Annealing ; Inter-Pass Annealing

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