Patent US4808226A successfully refreshed from Google Patents.
US4808226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearings fabricated from rapidly solidified powder and method
Assignee: United States, AIR FORCE, Secretary of, Department of
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Filing: 1987-11-24
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Granted: 1989-02-28
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Expires: 2007-11-24
Abstract
Abstract A process of fabricating steel stock for bearing components from highly alloyed steel powders supersaturated in carbon up to 0.5 weight percent in ferrite and up to 1.0 weight percent in austenite type combinations is disclosed. Rapid solidification of an atomized molten composition yields a metal powder with a diameter ranging between 75 and 105 microns. The metal powder is then compressed and heated to a low forging temperature between 1,600 DEG and 1,800 DEG F. to yield the steel stock.
Inventors
- 👤 Colin M. Adam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:02
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285; F; F16; F16C; F16C33/00; F16C33/30; F16C33/58; F16C33/62; Y; Y10; Y10S; Y10S384/00; Y10S384/90; Y10S384/912
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
139 words
A process for producing austenite and ferrite steel alloy stock, said process comprising the steps of: selecting and melting an alloy composition to produce a molten alloy wherein said alloy composition is selected from a group consisting of about 9-14 percent Cr, 6 percent Mo, 1 percent V, 1.15 percent C and the balance Fe; atomizing said molten alloy into a spray; rapidly quenching said spray into said steel alloy powder using a stream of helium gas and then screening to a particle size ranging between 75 and 105 microns; pouring said steel alloy powder into cylinders; consolidating said steel alloy powder with pressures ranging between 5 and 30 tons per square inch; and extracting said steel alloy stock from said cylinders when it cools, said alloy stock having RC hardness levels ranging between RC 60 and RC 64.
Claim 2
Dependent Claim
139 words
A process for producing austenite and ferrite steel alloy stock, said process comprising the steps of: selecting and melting an alloy composition to produce a molten alloy wherein said alloy composition is selected from a group consisting of about 9-14 percent Cr, 6 percent Mo, 1 percent V, 1.15 percent C and the balance Fe; atomizing said molten alloy into a spray; rapidly quenching said spray into said steel alloy powder using a stream of helium gas and then screening to a particle size ranging between 75 and 105 microns; pouring said steel alloy powder into cylinders; consolidating said steel alloy powder with pressures ranging between 5 and 30 tons per square inch; and extracting said steel alloy stock from said cylinders when it cools, said alloy stock having RC hardness levels ranging between RC 60 and RC 64.
Claim 3
Dependent Claim
11 words
The steel alloy stock produced by the process of claim 1.
Claim 4
Dependent Claim
142 words
A process for producing austenite and ferrite steel alloy stock, said process comprising the steps of: selecting and melting an alloy composition to produce a molten alloy, wherein said alloy composition is selected from a group consisting of about 4-10 percent tungsten, 1-6 percent chromium, 1-6 percent molybdenum, between 0.1-percent of vanadium, niobium, and carbon, and the balance Fe; atomizing said molten alloy into a spray; rapidly quenching said spray into said steel alloy powder using a stream of helium gas and then screening to a particle size ranging between 75 and 105 microns; pouring said steel alloy powder into cylinders; consolidating said steel alloy powder by extrusion at a temperature ranging between 1600F and 1800F; and extracting said steel alloy stock from said cylinders when it cools, said alloy stock having RC hardness levels ranging between RC 60 and RC 64.
Claim 5
Dependent Claim
142 words
A process for producing austenite and ferrite steel alloy stock, said process comprising the steps of: selecting and melting an alloy composition to produce a molten alloy, wherein said alloy composition is selected from a group consisting of about 4-10 percent tungsten, 1-6 percent chromium, 1-6 percent molybdenum, between 0.1-percent of vanadium, niobium, and carbon, and the balance Fe; atomizing said molten alloy into a spray; rapidly quenching said spray into said steel alloy powder using a stream of helium gas and then screening to a particle size ranging between 75 and 105 microns; pouring said steel alloy powder into cylinders; consolidating said steel alloy powder by extrusion at a temperature ranging between 1600F and 1800F; and extracting said steel alloy stock from said cylinders when it cools, said alloy stock having RC hardness levels ranging between RC 60 and RC 64.
Claim 6
Dependent Claim
11 words
The steel alloy stock produced by the process of claim 3.
References Cited (Backward Citations)
US3235417A
Cited
US4576642A
Cited
US3556780A
Cited
US3681061A
Cited
US3827863A
Cited
US3982905A
Cited
US3834004A
Cited
US3986867A
Cited
US4204887A
Cited
US4011108A
Cited
US4343750A
Cited
US4116684A
Cited
US4253874A
Cited
US4276085A
Cited
US4274876A
Cited
US4355057A
Cited
US4519839A
Cited
US4582536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-28 | 1992-08-29 | 1993-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-28 | 1996-08-29 | 1997-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-28 | 2000-08-29 | 2001-02-28 | $7700.00 | Window Closed / Lapsed |