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US4236943A
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Precipitation hardenable iron-nickel-chromium alloy having good swelling resistance and low neutron absorbence
Assignee: United States Department of Energy
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Filing: 1978-06-22
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Granted: 1980-12-02
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Expires: 1998-06-22
Abstract
Abstract An iron-nickel-chromium age-hardenable alloy suitable for use in fast breeder reactor ducts and cladding which utilizes the gamma-double prime strengthening phase and characterized in having a morphology of the gamma-double prime phase enveloping the gamma-prime phase and delta phase distributed at or near the grain boundaries. The alloy consists essentially of about 40-50% nickel, 7.5-14% chromium, 1.5-4% niobium, 0.25-0.75% silicon, 1-3% titanium, 0.1-0.5% aluminum, 0.02-0.1% carbon, 0.002-0.015% boron, and the balance iron. Up to 2% manganese and up to 0.01% magnesium may be added to inhibit trace element effects; up to 0.1% zirconium may be added to increase radiation swelling resistance; and up to 3% molybdenum may be added to increase strength.
Inventors
- 👤 Michael K. Korenko
- 👤 Howard F. Merrick
- 👤 Robert C. Gibson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:38
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/54; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/056; C22C30/00; Y; Y10; Y10S; Y10S376/00; Y10S376/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
60 words
An iron-nickel-chromium age-hardenable alloy characterized in having a compact morphology of the gamma-double prime phase enveloping the gamma-prime phase and consisting essentially of about 40 to 50% nickel, 7.5 to 14% chromium, 1.5 to 4% niobium, 0.25 to 0.75% silicon, 1 to 3% titanium, 0.1 to 0.5% aluminum, 0.02 to 0.1% carbon, 0.002 to 0.015% boron and the balance iron.
Claim 2
Dependent Claim
60 words
An iron-nickel-chromium age-hardenable alloy characterized in having a compact morphology of the gamma-double prime phase enveloping the gamma-prime phase and consisting essentially of about 40 to 50% nickel, 7.5 to 14% chromium, 1.5 to 4% niobium, 0.25 to 0.75% silicon, 1 to 3% titanium, 0.1 to 0.5% aluminum, 0.02 to 0.1% carbon, 0.002 to 0.015% boron and the balance iron.
Claim 3
Dependent Claim
15 words
The alloy of claim 1 in which the ratio of iron-to-nickel is less than one.
Claim 4
Dependent Claim
21 words
The alloy of claim 1 wherein the ratio of Ti+Al to Nb, when experessed in atomic percent, is greater than one.
Claim 5
Dependent Claim
15 words
The alloy of claim 1 wherein silicon is present in the amount of about 0.75%.
Claim 6
Dependent Claim
61 words
An iron-nickel-chromium age-hardenable alloy characterized in having a compact morphology of the gamma-double prime phase enveloping the gamma-prime phase consisting essentially of about 43 to 47% nickel, 8 to 12% chromium, 3 to 3.8% niobium, 0.3 to 0.4% silicon, 1.5 to 2% titanium, 0.2 to 0.3% aluminum, 0.02 to 0.05% carbon, 0.002 to 0.006% boron, and the balance essentially all iron.
Claim 7
Dependent Claim
61 words
An iron-nickel-chromium age-hardenable alloy characterized in having a compact morphology of the gamma-double prime phase enveloping the gamma-prime phase consisting essentially of about 43 to 47% nickel, 8 to 12% chromium, 3 to 3.8% niobium, 0.3 to 0.4% silicon, 1.5 to 2% titanium, 0.2 to 0.3% aluminum, 0.02 to 0.05% carbon, 0.002 to 0.006% boron, and the balance essentially all iron.
Claim 8
Dependent Claim
51 words
An iron-nickel-chromium age-hardenable alloy characterized in having a compact morphology of the gamma-double prime phase enveloping the gamma-prime phase and consisting essentially of about 45% nickel, about 12% chromium, about 3.6% niobium, about 0.35% silicon, about 1.7% titanium, about 0.3% aluminum, about 0.03% carbon, about 0.005% boron and the remainder iron.
Claim 9
Dependent Claim
51 words
An iron-nickel-chromium age-hardenable alloy characterized in having a compact morphology of the gamma-double prime phase enveloping the gamma-prime phase and consisting essentially of about 45% nickel, about 12% chromium, about 3.6% niobium, about 0.35% silicon, about 1.7% titanium, about 0.3% aluminum, about 0.03% carbon, about 0.005% boron and the remainder iron.
Claim 10
Dependent Claim
17 words
The alloy of claim 6 additionally containing about 0.2% manganese, about 0.01% magnesium, and about 0.05% zirconium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |