EP0053948A1
Expired / Lapsed
EP
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Nickel-chromium-cobalt base alloys and castings thereof
Assignee: Inco Europe Ltd
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Filing: 1981-12-10
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Granted: —
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Expires: 2001-12-10
Abstract
Abstract Nickel-chromium-cobalt base casting alloys having compositions within the range (in percent by weight) Cr 20-23%, Co 17-23%, W 1-2.5%, Mo 0-0.5%, Nb 0.4-1.2%, Ta 0.6-1.4%, Ti 2.95-3.85%. Al 1.6-2.8%. Hf 0.3-1.3%, Zr 0.005-1%, 8 0.001-1%, C 0.01-0.25%, balance Ni and impurities, wherein the contents of Nb, Hf, Ti and Al are further specifically correlated, exhibit at high temperatures a combination of good resistance to corrosion and very high creep-rupture lives, particularly when directionally solidified. The alloys are useful as materials for cast blades and vanes for gas turbines for marine and land-based service..
Inventors
- 👤 Stuart Walter Ker Shaw
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 02:36
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/055
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
135 words
A nickel-chromium-cobalt alloy, characterised in that it contains from 20 to 23% chromium, from 17 to 23% cobalt, from 1 to 2.5% tungsten, from 0 to O.5% molybdenum, from 0.4 to 1.2% niobium, from 0.6 to 1.4% tantalum, from 2.95 to 3.85% titanium, from 1.6 to 2.8% aluminium, from 0.3 to 1.3% hafnium, from 0.005 to 1% zirconium, from 0.001 to 1% boron, and from 0.01 to 0.25% carbon, the balance, apart from impurities, being nickel, wherein the contents of niobium, hafnium, titanium and aluminium are so correlated that they satisfy the expression (the Correlation Factor): 28327 Nb + 804 Hf + 36956 Ti + 115057 Al - 6676 N b 2 - 564 H f 2 - 4847 T i 2 - 54349 Al 2 + 8392 Al 3 - 5255 (NbxTi) ≥ 153123.
Claim 2
Dependent Claim
135 words
A nickel-chromium-cobalt alloy, characterised in that it contains from 20 to 23% chromium, from 17 to 23% cobalt, from 1 to 2.5% tungsten, from 0 to O.5% molybdenum, from 0.4 to 1.2% niobium, from 0.6 to 1.4% tantalum, from 2.95 to 3.85% titanium, from 1.6 to 2.8% aluminium, from 0.3 to 1.3% hafnium, from 0.005 to 1% zirconium, from 0.001 to 1% boron, and from 0.01 to 0.25% carbon, the balance, apart from impurities, being nickel, wherein the contents of niobium, hafnium, titanium and aluminium are so correlated that they satisfy the expression (the Correlation Factor): 28327 Nb + 804 Hf + 36956 Ti + 115057 Al - 6676 N b 2 - 564 H f 2 - 4847 T i 2 - 54349 Al 2 + 8392 Al 3 - 5255 (NbxTi) ≥ 153123.
Claim 3
Dependent Claim
33 words
An alloy according to claim 1 in which the carbon content is from 0.05 to 0.20%, the zirconium content is from 0.005 to 0.15% and the boron content is from 0.002 to 0.02%.
Claim 4
Dependent Claim
20 words
An,alloy according to claim 1 or claim 2 in which the value of the Correlation Factor is at least 153223.
Claim 5
Dependent Claim
49 words
An alloy according to claim 1 that contains about 22% chromium, about 19% cobalt, about 2% tungsten, about 1.1% tantalum, about 3.4% titanium, about 0.8% niobium, about 0.7% hafnium, about 2% aluminium, about 0.15% carbon, about 0.1% zirconium, and about 0.01% boron, the balance, apart from impurities, being nickel.
Claim 6
Dependent Claim
12 words
A directionally-solidified casting made from an alloy according to any preceding claim.
References Cited (Backward Citations)
GB607616A
Cited
FR1071278A
Cited
GB1036179A
Cited
FR2037772A5
Cited
FR2136231A5
Cited
GB1367661A
Cited
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