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

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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 non-metallic 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). Results indicated that by increasing temperature and processing time, greater level of cleanliness could be achieved, and numbers and size of the remaining inclusions decreased significantly. It was also observed that increasing calcium fluoride content of the slag helped reduce inclusion content.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Wisconsin Milwaukee, Milwaukee, 53211, USA

    Mohsen Hajipour Manjili

  2. Department of Materials Science and Engineering, Sharif University of Technology, Azadi Street, Tehran, 14588, Iran

    Mohammad Halali

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  1. Mohsen Hajipour Manjili
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  2. Mohammad Halali
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Correspondence to Mohammad Halali.

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Manuscript submitted May 21, 2017.

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Manjili, M.H., Halali, M. Removal of Non-metallic Inclusions from Nickel Base Superalloys by Electromagnetic Levitation Melting in a Slag. Metall Mater Trans B 49, 61–68 (2018). https://doi.org/10.1007/s11663-017-1137-z

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  • DOI: https://doi.org/10.1007/s11663-017-1137-z

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