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Investigation on deoxidation during VIM refining of Ni-based superalloys

Cai Qing-kui

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Abstract

The influence of carbon and aluminium on deoxidation during vacuum induction melting (VIM) of Ni-based superalloys using CaO crucible was studied. Thermodynamical calculation shows that the Al-O reaction can lake place during the VIM refining process, and oxygen mass fraction could be reduced to below 6×10 6. The Ni-Al-C-O equilibrium was also analyzed. The result showed that the reaction of C with A12O3 could take place in vacuum induction melting, so that the decreasing of C in refining was greater than the required one for deoxidation.

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What this paper is about

The influence of carbon and aluminium on deoxidation during vacuum induction melting (VIM) of Ni-based superalloys using CaO crucible was studied. Thermodynamical calculation shows that the Al-O reaction can lake place during the VIM refining process, and oxygen mass fraction could be reduced to below 6×10 6. The Ni-Al-C-O equilibrium was also analyzed. The result showed that the reaction of C with A12O3 could take place in vacuum induction melting, so that the decreasing of C in refining was greater than the required one for deoxidation.

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Available abstract

The influence of carbon and aluminium on deoxidation during vacuum induction melting (VIM) of Ni-based superalloys using CaO crucible was studied. Thermodynamical calculation shows that the Al-O reaction can lake place during the VIM refining process, and oxygen mass fraction could be reduced to below 6×10 6. The Ni-Al-C-O equilibrium was also analyzed. The result showed that the reaction of C with A12O3 could take place in vacuum induction melting, so that the decreasing of C in refining was greater than the required one for deoxidation.

Key concepts: Superalloy, Crucible (geodemography), Refining (metallurgy), Vacuum induction melting, Metallurgy, Materials science, Aluminium, Induction furnace

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