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EP0240451A2
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Single crystal articles having reduced anisotropy
Assignee: RTX Corp
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Filing: 1987-03-30
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Granted: —
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Expires: 2007-03-30
Abstract
Abstract The anisotropy typically observed in single crystal nickel base superalloys is reduced by intentionally adding certain small amounts of carbon, boron, zirconium or hafnium, either individually or in combination, to the alloy composition.
Inventors
- 👤 Dilip Manilal Shah
- 👤 David Noel Duhl
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 04:59
CPC Classifications
C; C30; C30B; C30B11/00; C30B29/00; C30B29/10; C30B29/52
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
63 words
A method for reducing the anisotropy of single crystal nickel base superalloys comprising the step of adding at least 0.002 weight percent of C, B, Zr or Hf and mixtures thereof to the alloy composition, the total C + B + Zr + Hf content being less than about 0.500 weight percent, wherein the normalized rupture life anisotropy increases at least about 20%.
Claim 2
Independent Claim
63 words
A method for reducing the anisotropy of single crystal nickel base superalloys comprising the step of adding at least 0.002 weight percent of C, B, Zr or Hf and mixtures thereof to the alloy composition, the total C + B + Zr + Hf content being less than about 0.500 weight percent, wherein the normalized rupture life anisotropy increases at least about 20%.
Claim 3
Dependent Claim
27 words
The method of claim 1, wherein the superalloy consists essentially of, by weight percent, 0-20Co, 3-18Cr, 0-18W, 3-8Al, 0-5Ti, 0-5Cb, 0-15Ta, 0-4Mo, 0-7Re, with the balance nickel.
Claim 4
Dependent Claim
51 words
A single crystal nickel base superalloy article having a high modulus of elasticity measured along the longitudinal axis of the article, and having its <100> axis greater than about 20° from the article longitudinal axis, and containing between about 0.002 and 0.500 weight percent (C + B + Zr + Hf).
Claim 5
Dependent Claim
51 words
A single crystal nickel base superalloy article having a high modulus of elasticity measured along the longitudinal axis of the article, and having its <100> axis greater than about 20° from the article longitudinal axis, and containing between about 0.002 and 0.500 weight percent (C + B + Zr + Hf).
Claim 6
Dependent Claim
20 words
The article of claim 3, wherein the room temperature modulus of elasticity is greater than about 22 × 10⁶ psi.
Claim 7
Dependent Claim
17 words
The article of claim 4 for use as a blade or vane in a gas turbine engine.
References Cited (Backward Citations)
No citation records indexed.
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