US4405368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron-aluminum alloys containing boron which have been processed by rapid solidification process and method
Assignee: Marko Materials Inc
•
Filing: 1981-05-07
•
Granted: 1983-09-20
•
Expires: 2001-05-07
Abstract
Abstract New iron base alloys containing aluminum and boron are disclosed. The alloys are subjected to a rapid solidification processing (RSP) technique which produces cooling rates between ˜10 5 to 10 7 ° C./sec. The as-quenched ribbon or powder, etc consists primarily of a metastable crystalline solid solution phase. The metastable crystalline phases are subjected to suitable heat treatments so as to produce a transformation to a stable multiphase microstructure which includes borides. The heat treated alloy exhibits superior mechanical properties with good corrosion and oxidation resistance.
Inventors
- 👤 Ranjan Ray
- 👤 Viswanathan Panchanathan
- 👤 Bill C. Giessen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:37
CPC Classifications
C; C22; C22C; C22C45/00; C22C45/02; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12431
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
145 words
A metastable crystalline solid solution alloy of composition Fe a Al b M d 1 Si e B f where M 1 is at least one element selected from the group consisting of Mo,W,Nb,Ta, and V and combinations thereof, wherein the subscripts represent atom percent having the values a=40-65, b=20-40, d=0-10, e=0-5, and f=5-17 with the provisos that the sum of e+f does not exceed 17 and is not less than 7 and the sum of a+b+d+e+f is 100, wherein the said alloy is being prepared by the method comprising the following steps: a. forming a melt of said alloy b. depositing said melt against a rapidly moving quench surface adapted to quench said melt at a rate in the range of approximately 10 5 to 10 7 ° C./second and form thereby a rapidly solidified brittle strip and, c. comminuting said strip into powders.
Claim 2
Dependent Claim
145 words
A metastable crystalline solid solution alloy of composition Fe a Al b M d 1 Si e B f where M 1 is at least one element selected from the group consisting of Mo,W,Nb,Ta, and V and combinations thereof, wherein the subscripts represent atom percent having the values a=40-65, b=20-40, d=0-10, e=0-5, and f=5-17 with the provisos that the sum of e+f does not exceed 17 and is not less than 7 and the sum of a+b+d+e+f is 100, wherein the said alloy is being prepared by the method comprising the following steps: a. forming a melt of said alloy b. depositing said melt against a rapidly moving quench surface adapted to quench said melt at a rate in the range of approximately 10 5 to 10 7 ° C./second and form thereby a rapidly solidified brittle strip and, c. comminuting said strip into powders.
Claim 3
Dependent Claim
30 words
The alloy of composition of claim 1 in the form of a body having fine grained microstructure and a thickness of at least 0.1 mm measured in the shortest dimension.
Claim 4
Dependent Claim
26 words
The alloy of claim 1 having the composition Fe 48-62 Al 25-35 B 13-17 wherein the sum of atom percent of Fe,Al, and B is 100.
Claim 5
Dependent Claim
30 words
The alloy of composition of claim 3 in the form of a body having fine grained microstructure and a thickness of at least 0.1 mm measured in the shortest dimension.
Claim 6
Dependent Claim
31 words
The alloy of claim 50 having the composition Fe 50-65 Al 25-35 Si 2-5 B 5-10 with the provisos that the sum of atom percent of Fe,Al,Si and B is 100.
Claim 7
Dependent Claim
30 words
The alloy of composition of claim 5 in the form of a body having fine grained microstructure and a thickness of at least 0.1 mm measured in the shortest dimension.
Claim 8
Dependent Claim
43 words
The alloy of claim 1 having the composition Fe 40-60 Al 25-35 Mo 5-10 Si 0-5 B 10-15 with the provisos that the atom percent of B+Si may not exceed 15 and the sum of atom percent of Fe,Al,Mo,Si, and B is 100.
Claim 9
Dependent Claim
30 words
The alloy of composition of claim 7 in the form of a body having fine grained microstructure and a thickness of at least 0.1 mm measured in the shortest dimension.
References Cited (Backward Citations)
US1493191A
Cited
USRE29989E
Cited
USRE30106E
Cited
US4052201A
Cited
US4236946A
Cited
US4197146A
Cited
US4264358A
Cited
US4297135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |