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Investigation of Inclusion Behavior in Molten Steel in Contact with Slag in the Presence of Electromagnetic Field

Pourali Manjili, Negin | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54697 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Halali, Mohammad
  7. Abstract:
  8. Much research has been done in the electromagnetic levitation process, but there is not any information about carrying out this process to refine steel continuously. In this study inclusion behavior of molten steel in contact with slag, in the presence of an electeomagnetic field, has been investigated. The steel sample, in an elliptical section, was levitated in an electromagnetic field, in a chamber containing slag consisting of CaF2-Al2O3-CaO, in order to achieve a continuous process, and changes in time, temperature and slag composition parameters in this process were studied. According to ASTM E45 standard, after performing metallographic process on melted samples, using light microscope, consecutive photos were taken from entire surface of the polished sample and the number of remaining inclusions was counted in different dimensions, also the effectiveness of the process was quantitatively evaluated using scanning electron microscopy and X-ray diffraction spectroscopy. The results showed that increasing the temperature, time and CaF2 content in the slag improves the removal of inclusions, in fact this result indicated that the elliptical cross section is the ideal form for the continuous electromagnetic levitation.
  9. Keywords:
  10. Steels ; Refining ; Electromagnetic Levitation ; Slags ; Treatment ; Inclusion Removal

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