Alloy for directional solidification and component made of stem-shaped crystals
AssigneesSiemens Aktiengesellschaft, Howmet Corporation
InventorsWinfried Eβer, Dirk Goldschmidt, Christopher R. Hanslits, Michael Ott, Uwe Paul, Ursula Pickert, Russell G. Vogt
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Abstract
A nickel-based superalloy is provided. Known nickel-based superalloys for producing components made of stem shaped single crystals do not provide sufficiently for grain boundary strength. The superalloy includes a low molybdenum content and very accurately adjusted values for elements having grain boundary strength and elements that precipitate in grain boundaries.
Claims15
A nickel-based superalloy for the directional solidification of components having columnar grains, the superalloy comprising (in % by weight):
- chromium
- 9.0 to 15.0;
- titanium
- 2.0 to 6.0;
- molybdenum
- 1.0 to 3.0;
- tungsten
- 2.0 to 6.0;
- tantalum
- 3.0 to 7.0;
- aluminum
- 2.0 to 6.0;
- cobalt
- 6.0 to 11.0;
- boron
- 0.0025 to 0.05;
- carbon
- 0.01 to 0.3,
- silicon in an amount of at least 0.01% by weight and at most 0.12% by weight,
- hafnium in an amount of at least 10 ppm and at most 75 ppm, and
- zirconium in an amount of at least 10 ppm and at most 25 ppm.
Dependencies are inferred from the claim text.