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Characterization of Aging Phenomenon on Mechanical Properties and Formability of Low Carbon Steel

Asgari, Farshad | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53550 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Karimi Taheri, Ali
  7. Abstract:
  8. Low carbon steel sheets have many applications in the automotive industry. The mechanical properties and ductility of the steel change significantly by the aging phenomena. In this study, the effects of temperature and time of quench aging phenomenon on the tensile properties and formability of a low carbon steel sheet has been investigated. Samples with dimensions of 10×10 cm were prepared for the Erichsen test and also samples with geometry in ASTM E8 standard were prepared for the tensile test of the steel sheet. After performing solution treatment on the samples at 650 °C, they were rapidly cooled to room temperature (25 °C) and then placed in water, air and oil at certain temperatures to allow the phenomenon of quench aging to take place in the samples. The selected temperatures for aging of the samples in these environments were 25, 50, 100, 150 °C. Also, the aging times of the samples were selected as 15, 30, 60, 120, 180, 240, 600 minutes. The results indicated that with increasing the aging time, the strength of the steel and consequently the work hardening exponent of the steel at different constant temperatures, first increases and then decreases. Moreover, although as the aging proceeds, we first see a decrease in tensile ductility and in Ericson formability index, but the notable increase in the work hardening exponent at the aging peak overcomes the reduction in the formability index
  9. Keywords:
  10. Mechanical Properties ; Formability ; Erichsen Test ; Plain Carbon Steel ; Quench Aging Kinetics ; Tensile Properties

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