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An Investigation into the Effect of Prestrain Temperature on the Static
Recrystallization of low Carbon Steel

Akbari, Edris | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48855 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): karimi Taheri, Ali
  7. Abstract:
  8. In this project the effect of rolling temperature on mechanical properties and microstructure evolution of a low carbon steel was studied. The steel was rolled up to a nominal strain of 67% at three different temperatures consisted of room, blue brittleness, and subzero temperature. Micreohardnessand tensile tests were used to characterize the recrystallization kinetics. Optical and scanning electron microscopic examinations were carried out to evaluate the mechanical, grain size, and the kinetics of static recrystallization by the Avrami equation. The results indicated that the volume fraction of static recrystallization increases with the increase in annealing period. The Avrami exponent appeared to be closely associated with deformation temperature and it ranged from ~ 1 to ~ 1. 5. The yield stress and ultimate tensile stress of the sample rolled at room temperature, blue brittleness temperature and subzero temperature reached 659.36 and 674 MPa, 710 and 730 MPa, and 747.17 and 769.4 MPa, respectively. The corresponding fracture strains of the mentioned specimens were 5.2%, 5.07% and 3.6 %. Moreover, it was found that the rolling reduction at blue brittle temperature leads to partial dissolution of iron carbides and formation of defects on both cementite and the matrix. These phenomena improved the mechanical properties compared to the mechanical properties of the specimens rolled at room temperature. Also, these phenomena improved the spheroidization of cementite after annealing
  9. Keywords:
  10. Static Recrystallization ; Low Carbon Steel ; Cold Rolling ; Kinetics Study ; Spheroidization

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