US4867807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for superplastic warm-die and pack forging of high-strength low-ductility material
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1986-12-05
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Granted: 1989-09-19
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Expires: 2006-12-05
Abstract
Abstract A high-strength low-ductility material is formed by a method which comprises treating a bulk or powder of the material thereby converting coarse grains thereof into hyperfine grains capable of manifesting superplasticity when the strain rate is higher than 5×10 -3 s -1 , enclosing the treated material with a metallic insulating member, heating the material to a temperature for manifestation of superplasticity, and forging the material by the use of a die in a state heated to a temperature beyond which the die yields to heat.
Inventors
- 👤 Yasunori Torisaka
- 👤 Masahito Katoh
- 👤 Yoshinori Nakawawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:11
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/12; B22F3/1208; B22F3/17; B22F3/24; C; C21; C21D; C21D8/00; Y; Y10; Y10S; Y10S420/00; Y10S420/902
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
98 words
A method for the forging of a high-strength low-ductility material, which comprises treating said high-strength low-ductility material thereby converting coarse grains thereof into hyperfine grains capable of manifesting superplasticity when the strain rate exceeds the level of 5×10 -3 s -1 , enclosing said treated material with a metallic insulating member, heating said material enclosed with said metallic insulating member to a temperature at which said material manifests superplasticity, and forging said material by the use of a die kept during the forging in a state heated to a temperature not exceeding said temperature for manifestation of superplasticity.
Claim 2
Independent Claim
98 words
A method for the forging of a high-strength low-ductility material, which comprises treating said high-strength low-ductility material thereby converting coarse grains thereof into hyperfine grains capable of manifesting superplasticity when the strain rate exceeds the level of 5×10 -3 s -1 , enclosing said treated material with a metallic insulating member, heating said material enclosed with said metallic insulating member to a temperature at which said material manifests superplasticity, and forging said material by the use of a die kept during the forging in a state heated to a temperature not exceeding said temperature for manifestation of superplasticity.
Claim 3
Dependent Claim
63 words
A method according to claim 1, wherein said treatment of said material for conversion of coarse grains into hyperfine grains is effected by subjecting said material to plastic deformation in a state heated to a temperature not exceeding the recrystallization temperature and falling within 150° C. of said recrystallization temperature and subsequently annealing the deformed material by heating at about said recrystallization temperature.
Claim 4
Dependent Claim
24 words
A method according to claim 1, wherrein said metallic insulating member possesses ductility and strength equal or inferior to the strength of said die.
Claim 5
Dependent Claim
15 words
A method according to claim 3, wherein said metallic insulating member completely encloses said material.
Claim 6
Dependent Claim
15 words
A method according to claim 3, wherein said metallic insulating member partially encloses said material.
Claim 7
Dependent Claim
20 words
A method according to claim 5, wherein said metallic insulating member encloses the part of said material to be forged.
Claim 8
Dependent Claim
23 words
A method according to claim 1, wherein said temperature for manifestation of superplasticity falls in the range of 500° C. to 1,200° C.
Claim 9
Dependent Claim
29 words
A method according to claim 1, wherein said die is made of a material which has the temperature of the heated die as the upper limit of heat-resisting temperature.
Claim 10
Dependent Claim
22 words
A method according to claim 8, wherein said die is heated to a temperature in the range of 200° to 950° C.
Claim 11
Dependent Claim
37 words
A method according to claim 1, wherein said material is a bulk or powder material selected from the group consisting of Ni-base alloys, Ti-base alloys, high speed tool steel, ultra high carbon steel, and δ/γ duplex steel.
Claim 12
Dependent Claim
16 words
A method according to claim 10, wherein said Ni-base alloys include IN-100, MAR-M-200 and Rene 95.
Claim 13
Dependent Claim
12 words
A method according to claim 10, wherein said Ti-base alloys include Ti-6Al-4V.
References Cited (Backward Citations)
JPS5884635A
Cited
US4600446A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |