Patent US3909309A successfully refreshed from Google Patents.
US3909309A
Expired / Lapsed
US
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Post working of mechanically alloyed products
Assignee: Huntington Alloys Corp
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Filing: 1973-09-11
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Granted: 1975-09-30
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Expires: 1993-09-11
Abstract
Abstract Special post extrusion working of mechanically alloyed superalloys dispersion-strengthened with an oxide of a lanthanide series metal results in improved stress-rupture properties.
Inventors
- 👤 Michael James Bomford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:42
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/24; C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0026
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
A PROCESS FOR ACHIVING ENHANCED STRESS-RUPTURE CHARACTERISTICS AT ELEVATED TEMPERATURES IN RESPECT OF A MECHANICALLY ALLOYED SUPERALLOY COMPOSITION CONTAINING AS A DISPERSOID AN OXIDE OF A LANTHANIDE SERIES METAL, WHEREBY THE ALLOY IS CAPABLE OF DEVELOPING A DESIRED STRUCTURE HAVING COARSE ELONGATED GRAINS UPON GERMINATIVE GRAIN GROWTH TREATMENT, WHICH COMPRISES HOT CONSOLIDATING A CHARGE OF SUCH MECHANICALLY ALLOYED COMPOSITE SUPPERALLOY POWDER PARTICLES AND THEREAFTER HOT WORKING THE RESULTING HOT CONSOLIDATED PRODUCT, THE TEMPERATURE OF HOT WORKING AND AMOUNTS OF REDUCTION BEING CORRELATED SUCH THAT (A) THE FORMATION OF SMALL EQUIAXED GRAINS UPON GRAIN COARSING HEAT TREATMENT IS MINIMIZED, AND (B) THE FORMATION OF COARSE EQUIAXED GRAINS AND/OR CRACKING OF THE CONSOLIDATED PRODUCT DURING THE HOT WORKING OPERATION IS MINIMIZED, WHEREBY COARSE ELONGATED GRAINS RESLT UPON SUBSEQUENT HEATING OF THE SHAPE AT GERMINATIVEGRAIN GROWTH TEMPERATURE.
Claim 2
Dependent Claim
134 words
A PROCESS FOR ACHIVING ENHANCED STRESS-RUPTURE CHARACTERISTICS AT ELEVATED TEMPERATURES IN RESPECT OF A MECHANICALLY ALLOYED SUPERALLOY COMPOSITION CONTAINING AS A DISPERSOID AN OXIDE OF A LANTHANIDE SERIES METAL, WHEREBY THE ALLOY IS CAPABLE OF DEVELOPING A DESIRED STRUCTURE HAVING COARSE ELONGATED GRAINS UPON GERMINATIVE GRAIN GROWTH TREATMENT, WHICH COMPRISES HOT CONSOLIDATING A CHARGE OF SUCH MECHANICALLY ALLOYED COMPOSITE SUPPERALLOY POWDER PARTICLES AND THEREAFTER HOT WORKING THE RESULTING HOT CONSOLIDATED PRODUCT, THE TEMPERATURE OF HOT WORKING AND AMOUNTS OF REDUCTION BEING CORRELATED SUCH THAT (A) THE FORMATION OF SMALL EQUIAXED GRAINS UPON GRAIN COARSING HEAT TREATMENT IS MINIMIZED, AND (B) THE FORMATION OF COARSE EQUIAXED GRAINS AND/OR CRACKING OF THE CONSOLIDATED PRODUCT DURING THE HOT WORKING OPERATION IS MINIMIZED, WHEREBY COARSE ELONGATED GRAINS RESLT UPON SUBSEQUENT HEATING OF THE SHAPE AT GERMINATIVEGRAIN GROWTH TEMPERATURE.
Claim 3
Dependent Claim
55 words
A process in accordance with claim 1 in which the lanthanide metal series oxide dipsersoid is of the group lanthana, didymia, rare earth oxide and ceria, the lanthana, didymia, rare earth oxides being respectively either hot forged or hot rolled within the combination of hot working temperature range and hot working reduction range given below.
Claim 4
Dependent Claim
23 words
A process in accordance with claim 2 in which the hot forging or hot rolling operation is conducted in accordance with the following:
Claim 5
Dependent Claim
24 words
A process in accordance with claim 2 in which the dispersoid material is present in an amount of up to about 10% by volume.
Claim 6
Dependent Claim
24 words
A process in accordance with claim 2 in which the dipsersoid material is present in an amount of about 1 to 3% by volume.
Claim 7
Dependent Claim
122 words
A process in accordance with claim 1 in which the dispersion-strengthened mechanically alloyed superalloy is of a composition containing up to 65% chromium, up to about 8% aluminum, up to about 8% titanium, up to about 40% molybdenum, up to 40% tungsten, up to about 20% columbium, up to about 40% tantalum, up to about 5% vanadium, up to about 15% manganese, up to about 0.5% magnesium, up to about 2% carbon, up to about 3% silicon, up to about 1% boron, up to 2% zirconium, up to about 6% hafnium, up to about 40% iron, up to about 10% or more by volume of a dispersoid material comprising an oxide of lanthanide series metal, and the balance essentially nickel and/or cobalt.
Claim 8
Dependent Claim
108 words
A process in accordance with claim 1 in which the dispersion-strengthened mechanically alloyed superalloy is of a composition containing about 5% to about 35% chromium, about 0.5% to about 13% of metal from the group of aluminum and titanium, up to about 15% molybdenum, up to about 20% tungsten, up to about 10% columbium, up to about 10% tantalum, up to about 3% vanadium, up to about 2% manganese, up to about 2% silicon, up to about 0.75% carbon, up to about 0.1% boron, up to 1% zirconium, up to about 0.2% magnesium, up to about 35% iron, and about 1 to 3% by volume of dispersoid material.
Claim 9
Dependent Claim
46 words
A process in accordance with claim 2 in which the hot worked product is heated at a temperature of from about 2200*F. to below the incipient melting point of the alloy, whereby a microstructure is obtained having coarse elongated grains and few, if any, fine grains.
Claim 10
Dependent Claim
24 words
A process in accordance with claim 2 in which the dispersoid is of an average particle size of about 150 to about 600 Angstroms.
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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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |