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Investigation of Multistage Static Strain Aging of Low Carbon Steel using Rolling Pre-strain

Rizehvandy, Siroos | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48715 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): karimi taheri, Ali
  7. Abstract:
  8. In the present study, multistage strain aging phenomenon using rolling pre-strain and solution treatment at 680℃ for 40 min was used to study the effect of temperature and inter-pass time (IPT) on the static strain aging behavior of a low carbon steel sheet. The increase in hardness and strength caused by work hardening and the aging at each pass were separately calculated.The samples were rolled and subjected to aging process both in a single pass of 20% rolling reduction in thickness and in four stages consisted of 5% reduction at each stage. The mechanical properties of the samples aged at different time and temperature, were compared. In order to evaluate the effects of pre-strain type, samples were also tested using tensiles strain at the same rolling conditions. The effect of cyclic solution treatment between 680℃ and 500℃ on the kinetics of multistage strain aging at 250℃ was also assessed. It was found that in general, the multistage strain aging using rolling pre-strain and typically solution treatment cause a delay time of about 10 to 15 minutes to reach the maximum strength compared with the tensile pre-strain for typically solution treatment. It was shown that the UTS of the steel increases 42% and its fracture strain decreases 23% by cyclic solution treatment. Moreover, by increasing the aging temperature from 200℃ to 250℃ for typically solution treatment, the inter-pass time to reach the maximum strength, yield strength, and hardness is decreased about 25-33%
  9. Keywords:
  10. Static Strain Aging ; Solution Treatment ; Low Carbon Steel ; Multistage Strainaging ; Rolling Prestrain ; Tensile Prestrain ; Cyclic Solution Treatment

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