SEDL / STP / STP174-EB / STP44988S

Effect of Rare Earth Additions on the High-Temperature Properties of a Cobalt-Base Alloy

Breen, J. E.
Metallurgist, and Head, High Temperature Alloys Branch, Metallurgy Division, Naval Research Laboratory, Washington, D. C.

Lane, J. R.
Metallurgist, and Head, High Temperature Alloys Branch, Metallurgy Division, Naval Research Laboratory, Washington, D. C.

Pages: 12    Published: Jan 1956

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Abstract

Improvements in the high-temperature mechanical properties of a typical cobalt-base alloy were achieved by the addition of rare earths as misch metal. Three alloys of the same base composition but with 0 to 2 per cent rare earth added were cast from a split heat. Stress-rupture tests were run at 1500, 1600, and 1700 F.

The high-temperature strength as well as ductility were increased in both as-cast and aged material at all temperatures, with the greatest benefit occurring at 1500 F. No improvements in room temperature tensile properties were noted.