The possibility is established of reducing the sulfur content in cast nickel superalloys to less than 1 ppm (0.0001 wt.%) with addition to alloys of an increased amount of rare earth metals previously refined with alkaline-earth metals and filtered through a ceramic foam filter during casting. Use of mass spectrometry with a glow discharge makes it possible to develop a method for determining and ultralow sulfur content in nickel superalloys.
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Translated from Metallurg, Vol. 64, No. 1, pp. 59–62, January, 2020.
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Sidorov, V.V., Yakimovich, P.V. & Alekseev, A.V. Refining Complexly Alloyed Molten Nickel from Sulfur Impurity to Less than 1 Ppm During Vacuum Melting. Metallurgist 64, 61–66 (2020). https://doi.org/10.1007/s11015-020-00966-1
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DOI: https://doi.org/10.1007/s11015-020-00966-1