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Study of Microstructure and Mechanical Properties of Austenitic Stainless Steel after Sheet Rolling Process

Abedi, Fatemeh | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49377 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Serajzadeh, Siamak
  7. Abstract:
  8. Austenite in the 300 stainless steels is not a table phase in deformation processing during which martensite phase forms. This causes significant changes in the microstructures as well as the mechanical properties of deformed steel. In this work, the effects of rolling speed, reduction, temperature and strain pass on the strain-induced martensite during strip rolling operation of stainless steel 304L are studied. Cold rolling experiments under different speeds, reduction and temperature are conducted and then, the microstructural events and mechanical properties of the rolled steel are evaluated. For doing so, different testing techniques including tensile test, hardness measurement, optical metallography, X-ray diffraction, scanning electron microscopy(SEM) and polarization are employed. Also with the use of mathematical modeling, plastic strain field and temperature distribution of steel during cold rolling were predicted. And with the aid of simulation results the mechanism of microstructure transformation and mechanical properties were investigated. The results show that the decrease of temperature from room temperature to -10℃ or the decrease of rolling speed from 0.2 m/s to 0.55 m/s and also an increase of reduction from 8% to 22% leads to notable changes in mechanical properties e.g. increase of yield stress from 270 MPa for anneal condition to maximum of 940 MPa
  9. Keywords:
  10. Strain Distribution ; Temperature Distribution ; Finite Element Method ; 304 Austenitic Stainless Steel ; Microstructure ; Deformation Induced Martensite ; Rolling Force

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