Influence of crucible materials on high-temperature properties of vacuum-melted nickel-chromium-cobalt alloy

R. F. Decker, John P. Rowe, J. W. Freeman
naca-tn-4049
Jun 1957


A study of the effect of induction-vacuum-melting procedure on the high-temperature properties of a titanium-and-aluminum-hardened nickel-base alloy revealed that a major variable was the type of ceramic used as a crucible. Reactions between the melt and magnesia or zirconia crucibles apparently increased high-temperature properties by introducing small amounts of boron or zirconium into the melts. Heats melted in alumina crucibles had relatively low rupture life and ductility at 1,600 F and cracked during hot-working as a result of deriving no boron or zirconium from the crucible.

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