Metallurgist

, Volume 61, Issue 5–6, pp 400–405 | Cite as

Desulfurization of Single-Crystal Nickel Superalloys with Vacuum Melting

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An unfavorable effect is established for a high sulfur content on the high-temperature strength properties of single-crystal alloy ZhS36 in stress-rupture tests based on 500 h, on the average number of cycles to failure during low-cycle fatigue tests, and also on coated alloy isothermal heat resistance. The unfavorable effect of sulfur may be overcome by alloy refinement with lanthanum followed by melt filtration through a ceramic foam filter during casting. Metallographic study confirms the results obtained for the effect of alloy refinement with lanthanum.

Keywords

lanthanum sulfur heat-resistance properties low-cycle fatigue single crystal 

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Copyright information

© Springer Science+Business Media, LLC 2017

Authors and Affiliations

  1. 1.State Research Center of the Russian Federation – All-Russia Research Institute of Aviation MaterialsMoscowRussia

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