US3787205A
Expired / Lapsed
US
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Forging metal powders
Assignee: Huntington Alloys Corp
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Filing: 1972-05-30
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Granted: 1974-01-22
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Expires: 1992-05-30
Abstract
Abstract Alloy metal powders are forged over a controlled temperature range such that at the forging temperature the alloy powders are characterized by a microstructure comprised of at least two metallic phases which coact to retard grain growth during recrystallization.
Inventors
- 👤 N Church
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:20
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/17; B22F2998/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
43 words
A process in accordance with claim 1 in which two metallic phases are present, one being face-centered-cubic and the other being body-centered-cubic and each is present in a volume percentage of at least 20 percent and the preform is formed from prealloyed powder.
Claim 2
Dependent Claim
39 words
A process in accordance with claim 1 in which one of the metallic phases is present in a range of about 55 to 75 percent and the grain sizes of the metallic phases average at least about ASTM 12.
Claim 3
Dependent Claim
15 words
A process in accordance with claim 1 in which the alloy is a stainless steel.
Claim 4
Dependent Claim
75 words
A process in accordance with claim 4 in which the stainless steel contains from 15 to 35 percent chromium, about 2 to 12 percent nickel, about 0.025 to 0.25 percent oxygen, up to 0.25 percent carbon, up to 1.5 percent titanium, up to 1 percent vanadium, up to 1 percent each of silicon and manganese, up to 4 percent molybdenum, up to 2 percent cobalt, up to 3 percent copper, the balance being essentially iron.
Claim 5
Dependent Claim
59 words
A process in accordance with claim 1 in which the alloy is a nickel-chromium alloy having from 25 to 50 percent chromium, 14 to 22 percent iron, up to 1 percent titanium, about 0.025 to 0.25 percent oxygen, carbon up to about 0.1 percent, up to 1 percent silicon, up to 1 percent manganese, and the balance essential nickel.
Claim 6
Dependent Claim
26 words
A process in accordance with claim 1 in which the metallic phases are comprised of alpha and beta and in which the alloy base is copper.
Claim 7
Dependent Claim
46 words
A process in accordance with claim 7 in which the copper-base alloy contains up to 6 percent iron and one metal from the group consisting of zinc and aluminum, the zinc being from 35 to 50 percent and the aluminum being from 8 to 14 percent.
Claim 8
Dependent Claim
53 words
A process in accordance with claim 1 in which the alloy powders used in forming the preform are of a particle size not greater than about 275 microns with their outer surfaces being substantially enveloped by an oxide film not greater than about 10 microns in thickness, the particles being of irregular shape.
References Cited (Backward Citations)
US2809891A
Cited
US3702791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |