O\Hara Kevin S. (Boxford MA) Walston William S. (Maineville OH) Ross Earl W. (Cincinnati OH) Darolia Ramgopal (W. Chester OH)
출원인 / 주소
General Electric Company (Cincinnati OH 02)
인용정보
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29인용 특허 :
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초록▼
The present invention provides a nickel base superalloy having an improved combination of stress rupture life and microstructural stability with respect to the formation of TCP phases. A unique feature is the specific combination of the content of elements consisting of Al, Ti and W in a second rang
The present invention provides a nickel base superalloy having an improved combination of stress rupture life and microstructural stability with respect to the formation of TCP phases. A unique feature is the specific combination of the content of elements consisting of Al, Ti and W in a second range defined by their sum in a nickel base superalloy having high contents of rhenium, in excess of 1.3 atomic percent (about 4.0 weight percent) to lower the propensity for TCP phase formation and thus render the alloy more stable at high temperatures. The interaction of Ru with the remaining elements to modify the refractory element phase partitioning provides unique capabilities, causing elements to partition to the gamma phase or the gamma prime phase in a reverse direction than normally experienced in Ni-base superalloys. These Ni-base superalloys are termed Ru-containing Reverse Partitioning Ni-base Superalloys. The composition of these Reverse Partitioning Ni-base superalloys is in the range, in atomic percent, of 1.3-3% Re, 2.0-3.7% Ta, 4.0-18.0% Co, 0-0.2% Hf, 0-0.3% C, 0-0.05% B, 0-0.03% Y, 0-2.0% Mo, 1.5-7.2% Cr, 0-0.3% Cb, 12.0-15.0% Al, 0-1.3% Ti, 1.0-2.5% W, in combination with 0.25-4.0 Ru and the balance Ni and incidental impurities.
대표청구항▼
A nickel base superalloy single crystal article having an improved combination of stress rupture life and microstructural stability and which minimizes the detrimental formation of topologically close packed phases in the superalloy microstructure at elevated temperatures, the superalloy single crys
A nickel base superalloy single crystal article having an improved combination of stress rupture life and microstructural stability and which minimizes the detrimental formation of topologically close packed phases in the superalloy microstructure at elevated temperatures, the superalloy single crystal article characterized by a specific combination of Ru with a first group of elements consisting of Mo, Cr and Cb in a first range defined by their sum in atomic percent, and a second group of elements consisting of Al, Ti and w in a second range defined by their sum in atomic percent, the composition of the superalloy article consisting essentially of, in atomic percent: about 0.25-4.0% (about 0.4-6.5 weight %) Ru, in combination with about 1.5-1.95% (about 4.5-5.75 weight %) Re, about 2.0-3.7% (about 5.8-10.7 weight %) Ta, about 4.0-16.0% (about 4.25-17.0 weight %) Co, about 0-0.16% (about 0-0.05 weight %) Hf, about 0-0.03% (about 0-0.06 weight %) C, 0-0.05% (about 0-0.01 weight % ) B, about 0-0.03% (about 0-0.02 weight % ) Y, 0.6-1.25% (about 0.9-2.0 weight %) Mo, about 1.5-7.2% (about 1.25-6.0 weight %) Cr, about 0-0.7% (about 0-1.0 weight %) Cb, 12.0-15.0% (about 5.0-6.6 weight %) Al, about 0-1.3% (about 0-1.0 weight %) Ti, about 1.0-2.5% (about 3.0-7.5 weight %) W, wherein the sum of the first range, defined by the first group of elements consisting of Mo+Cr+Cb, is about 1.5-8.0%, and wherein the sum of the second range, defined by the second group of elements consisting of Al+Ti+W, is about 13.5-17.2%, the balance Ni and incidental impurities.
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