Nickel base superalloy single crystal articles with improved performance in air and hydrogen

This invention relates to nickel base superalloy articles possessing improved resistance to hydrogen embrittlement, and also improved fatigue resistance in air. The invention comprises a combination of aspects including composition, and heat treatment which produce an unexpected improvement in prope...

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Main Authors DeLuca, Daniel P, Cowles, Bradford A, Gell, Maurice L, Duhl, David N, Cetel, Alan D, Biondo, Charles M
Format Patent
LanguageEnglish
Published 12.03.2002
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Abstract This invention relates to nickel base superalloy articles possessing improved resistance to hydrogen embrittlement, and also improved fatigue resistance in air. The invention comprises a combination of aspects including composition, and heat treatment which produce an unexpected improvement in properties in certain environments. The invention primarily comprises a limited composition range in combination with a specific heat treatment and a HIP treatment. The result of this product has the unique combination of properties previously described. Compositional requirements and processing improvements are disclosed which improve the hydrogen embrittlement resistance and the fatigue resistance in air of nickel base single crystal articles. The compositional requirements enlarge the difference between the ′ solvus temperature and the incipient melting temperature, thus enabling the solution of / ′ eutectic islands without causing incipient melting, while hot isostatic pressing and careful melt practice eliminate porosity and carbides, borides and nitrides, all of which act as crack initiation sites.
AbstractList This invention relates to nickel base superalloy articles possessing improved resistance to hydrogen embrittlement, and also improved fatigue resistance in air. The invention comprises a combination of aspects including composition, and heat treatment which produce an unexpected improvement in properties in certain environments. The invention primarily comprises a limited composition range in combination with a specific heat treatment and a HIP treatment. The result of this product has the unique combination of properties previously described. Compositional requirements and processing improvements are disclosed which improve the hydrogen embrittlement resistance and the fatigue resistance in air of nickel base single crystal articles. The compositional requirements enlarge the difference between the ′ solvus temperature and the incipient melting temperature, thus enabling the solution of / ′ eutectic islands without causing incipient melting, while hot isostatic pressing and careful melt practice eliminate porosity and carbides, borides and nitrides, all of which act as crack initiation sites.
Author Duhl, David N
DeLuca, Daniel P
Biondo, Charles M
Cetel, Alan D
Cowles, Bradford A
Gell, Maurice L
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References Fiedler et al. (4677035) 19870600
DeLuca et al. (5725692) 19980300
Berger et al. (5395584) 19950300
Darolia et al. (4849030) 19890700
Kudo et al. (4400211) 19830800
Kudo et al. (4421571) 19831200
Kudo et al. (4400209) 19830800
Berkowitz et al. (4245698) 19810100
Kudo et al. (4400210) 19830800
Pugliese et al. (4099992) 19780700
Kudo et al. (4400349) 19830800
Ohno et al. (4802934) 19890200
Naik (4885216) 19891200
Naik et al. (5077141) 19911200
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Title Nickel base superalloy single crystal articles with improved performance in air and hydrogen
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