Patent US3151312A successfully refreshed from Google Patents.
US4297135A
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High strength iron, nickel and cobalt base crystalline alloys with ultrafine dispersion of borides and carbides
Assignee: Marko Materials Inc
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Filing: 1979-11-19
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Granted: 1981-10-27
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Expires: 1999-11-19
Abstract
Abstract Alloys, of iron, cobalt, nickel and chromium containing both metalloids and refractory metals are disclosed. The alloys are rapidly solidified at cooling rates of 10 5 -10 7 ° C./sec so as to produce an ultrafine grained metastable crystal structure having enhanced compositional homogeneity. The as-quenched metastable alloys are brittle, permitting pulverization, if desired. Heat treatment is used to convert the metastable brittle alloys into ductile alloys with primary grains of ultrafine grain size which contain an ultrafine dispersion of boride as well as carbide and/or silicide particles. The powders or ribbons can be consolidated into bulk parts. The heat treated alloys possess good mechanical properties, in particular high strength and hardness, as well as good corrosion resistance for selected compositions, making them suitable for many engineering applications.
Inventors
- 👤 Bill C. Giessen
- 👤 Donald E. Polk
- 👤 Ranjan Ray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:56
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/0047; B; B22; B22F; B22F9/00; B22F9/002; B22F9/008
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
219 words
A crystalline metal alloy of the formula M a R b X c where M is at least one element selected from the group consisting of iron, nickel, cobalt and chromium and mixtures thereof, R is at least one element selected from the group consisting of zirconium, tantalum, niobium, molybdenum, tungsten, titanium and vanadium and mixtures thereof and X is at least one element selected from the group consisting of boron, silicon and carbon and mixtures thereof, wherein a, b and c are atomic percentages ranging from 85 to 95, 1 to 12 and 3 to 12, respectively, and boron is present at the level of at least 3 at %, said alloy having been prepared from the melt thereof by a rapid solidification process characterized by cooling rates in the range of about 10 5 ° to 10 7 ° C./sec, said alloy subsequently subjected to the application of heat thereto and characterized by a fine grained microstructure with primary grains having an average grain size of less than about 10 microns with a substantially uniform dispersion of ultra fine particles of borides in the fine primary metallic grains, said ultra fine particles having a characteristic particle size of less than 0.5 micron and being dispersed throughout the inside of the primary grains and along the grain boundaries.
Claim 2
Dependent Claim
219 words
A crystalline metal alloy of the formula M a R b X c where M is at least one element selected from the group consisting of iron, nickel, cobalt and chromium and mixtures thereof, R is at least one element selected from the group consisting of zirconium, tantalum, niobium, molybdenum, tungsten, titanium and vanadium and mixtures thereof and X is at least one element selected from the group consisting of boron, silicon and carbon and mixtures thereof, wherein a, b and c are atomic percentages ranging from 85 to 95, 1 to 12 and 3 to 12, respectively, and boron is present at the level of at least 3 at %, said alloy having been prepared from the melt thereof by a rapid solidification process characterized by cooling rates in the range of about 10 5 ° to 10 7 ° C./sec, said alloy subsequently subjected to the application of heat thereto and characterized by a fine grained microstructure with primary grains having an average grain size of less than about 10 microns with a substantially uniform dispersion of ultra fine particles of borides in the fine primary metallic grains, said ultra fine particles having a characteristic particle size of less than 0.5 micron and being dispersed throughout the inside of the primary grains and along the grain boundaries.
Claim 3
Dependent Claim
242 words
A crystalline metal alloy of the formula M a R b X c where M is at least one element selected from the group consisting of iron, nickel, cobalt and chromium and mixtures thereof, R is at least on element selected from the group consisting of zirconium, tantalum, niobium, molybdenum, tungsten, titanium and vanadium and mixtures thereof and X is at least one element selected from the group consisting of boron, silicon and carbon and mixtures thereof, wherein a, b and c are atomic percentages ranging from 85 to 95, 1 to 12 and 3 to 12, respectively, boron is present at the level of at least 3 at %, and chromium is present in said alloy in the range of 10 to 40 at %, said alloy having been prepared from the melt thereof by a rapid solidification process characterized by cooling rates in the range of about 10 5 ° to 10 7 ° C./sec, said alloy subsequently subjected to the application of heat thereto and characterized by a fine grained microstructure with primary grains having an average grain size of less than about 10 microns with substantially uniform dispersion of ultra fine particles of at least one of a group consisting of borides, carbides and silicides and mixtures thereof with at least said borides having an average particle size of less than 0.5 micron and being dispersed throughout the inside of the primary grains and along the grain boundaries.
Claim 4
Dependent Claim
242 words
A crystalline metal alloy of the formula M a R b X c where M is at least one element selected from the group consisting of iron, nickel, cobalt and chromium and mixtures thereof, R is at least on element selected from the group consisting of zirconium, tantalum, niobium, molybdenum, tungsten, titanium and vanadium and mixtures thereof and X is at least one element selected from the group consisting of boron, silicon and carbon and mixtures thereof, wherein a, b and c are atomic percentages ranging from 85 to 95, 1 to 12 and 3 to 12, respectively, boron is present at the level of at least 3 at %, and chromium is present in said alloy in the range of 10 to 40 at %, said alloy having been prepared from the melt thereof by a rapid solidification process characterized by cooling rates in the range of about 10 5 ° to 10 7 ° C./sec, said alloy subsequently subjected to the application of heat thereto and characterized by a fine grained microstructure with primary grains having an average grain size of less than about 10 microns with substantially uniform dispersion of ultra fine particles of at least one of a group consisting of borides, carbides and silicides and mixtures thereof with at least said borides having an average particle size of less than 0.5 micron and being dispersed throughout the inside of the primary grains and along the grain boundaries.
Claim 5
Dependent Claim
26 words
A crystalline metal alloy according to claim 1 wherein said ultra fine particles include at least one of a group consisting of borides, carbides, and silicides.
Claim 6
Dependent Claim
15 words
A crystalline metal alloy according to claim 3 wherein said alloy is in powder form.
Claim 7
Dependent Claim
15 words
A crystalline metal alloy according to claim 3 wherein said alloy is in ribbon form.
Claim 8
Dependent Claim
29 words
A crystalline metal alloy according to claim 3 wherein said alloy is in an alloy body having a thickness of at least 0.2 millimeter measured in the shortest dimensions.
Claim 9
Dependent Claim
37 words
A crystalline metal alloy according to claim 3 wherein said primary grains have an average large dimension of less than 3 microns and wherein said ultrafine particles have an average large dimension of less than 0.2 micron.
Claim 10
Dependent Claim
15 words
A crystalline metal alloy according to claim 2 wherein said alloy is in powder form.
Claim 11
Dependent Claim
15 words
A crystalline metal alloy according to claim 2 wherein said alloy is in ribbon form.
Claim 12
Dependent Claim
29 words
A crystalline metal alloy according to claim 2 wherein said alloy is in an alloy body having a thickness of at least 0.2 millimeter measured in the shortest dimension.
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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) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |