US4490186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermal-mechanical working of wrought non-hardenable nickel alloy
Assignee: RTX Corp
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Filing: 1982-11-10
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Granted: 1984-12-25
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Expires: 2002-11-10
Abstract
Abstract The weld zone in Hastelloy X nickel superalloy is thermal mechanically worked by cold working the weld zone to reduce its thickness by about 5-40%, and by annealing at 1120°-1175° C. for one hour to cause recrystallization. Low cycle fatigue properties of laser and gas tungsten arc weld zones are substantially increased.
Inventors
- 👤 Roger B. Sines
- 👤 Thomas T. Field
- 👤 Patrick F. Papineau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:47
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
95 words
In the fabrication of a welded structure of a wrought alloy consisting essentially by weight percent of 22 Cr, 1.5 Co, 18.5 Fe, 9 Mo, 0.1 C, 0.6 W, balance Ni, the method of providing good fatigue life to a weld zone which comprises cold working the weld zone to reduce the cross section thereof by at least 5%, thereafter heat treating the weld zone at a temperature of 1125°-1175° C. to recrystallize the weld zone; and continuing the heat treatment for about one hour to produce therein a grain size of ASTM No. 4-8.
Claim 2
Dependent Claim
95 words
In the fabrication of a welded structure of a wrought alloy consisting essentially by weight percent of 22 Cr, 1.5 Co, 18.5 Fe, 9 Mo, 0.1 C, 0.6 W, balance Ni, the method of providing good fatigue life to a weld zone which comprises cold working the weld zone to reduce the cross section thereof by at least 5%, thereafter heat treating the weld zone at a temperature of 1125°-1175° C. to recrystallize the weld zone; and continuing the heat treatment for about one hour to produce therein a grain size of ASTM No. 4-8.
Claim 3
Dependent Claim
22 words
The method of claim 1 characterized by cold working which reduces the cross section by 20-35% and heat treating at 1150±15° C.
Claim 4
Dependent Claim
51 words
An article produced by the method of claim 1 characterized by a wrought alloy having a grain size of ASTM No. 4-8 and a weld zone having a grain size of ASTM No. 4-8, the portion containing the weld having a fatigue life about equal to a portion having no weld.
References Cited (Backward Citations)
US3279050A
Cited
US3645726A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |