Removal of Non-Metallic Inclusions from Nickel Base Superalloys by Electromagnetic Levitation Melting in a Slag

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Haje Por Manjeli, Mohsen | 2012

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 43874 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Halali, Mohammad
Abstract:
Samples of INCONEL 718 were levitated and melted in a slag by the application of an electromagnetic field. The effects of temperature, time and slag composition on the inclusion content of the samples were studied thoroughly. Samples were compared with the original alloy to study the effect of the process on inclusions. Size, shape and chemical composition of remaining nonmetallic inclusions were investigated. The samples were prepared by Standard Guide for Preparing and Evaluating Specimens for Automatic Inclusion Assessment of Steel (ASTM E 768-99) method and the results were reported by means of the Standard Test Methods for Determining the Inclusion Content of Steel (ASTM E 45-97). Chemical compositions of the remaining inclusions were analyzed by Scanning Electron Microscopy. Results indicated that by increasing temperature and processing time, greater level of cleanliness could be achieved, and number and size of the remaining inclusions decreased. It was also observed that increasing calcium fluoride content of the slag helped reduce inclusion content
Keywords:
Refining ; Nickel-Base Superalloy ; Electromagnetic Induction ; Slags

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