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US4601874A
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Process for forming a titanium base alloy with small grain size by powder metallurgy
Assignee: Office National d'Études et de Recherches Aérospatiales
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Filing: 1985-07-08
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Granted: 1986-07-22
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Expires: 2005-07-08
Abstract
Abstract A process for forming a titanium base alloy comprises compacting a powder formed of particles of titanium or of a mother alloy thereof and of a dispersion of fine particles of a product curbing the growth of the grain size, in a proportion per volume which is less than that which would lead to the formation of a continuous layer of fine particles about the particles of titanium powder. Then the alloy is heat treated at a temperature higher than the point of transformation into phase beta and quenched. The product is typically selected among S, P, B, As, Se, Te, Y and the lanthanides.
Inventors
- 👤 Michel Marty
- 👤 Henri Octor
- 👤 Andre Walder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:44
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/051; C22C1/053
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
A process for forming a titanium base alloy having a small grain size, comprising the steps of compacting a powder formed of particles of titanium or of mother alloy thereof, heat treating at a temperature higher than the point of transformation into phase β and quenching wherein the powder further contains a dispersion of fine particles of a product curbing the growth of the grain size, in a proportion per volume less than that which would lead to the formation of a continuous layer of fine particles about the particles of titanium powder, said product particles being present at the surface of the titanium grains in the alloy obtained.
Claim 2
Dependent Claim
109 words
A process for forming a titanium base alloy having a small grain size, comprising the steps of compacting a powder formed of particles of titanium or of mother alloy thereof, heat treating at a temperature higher than the point of transformation into phase β and quenching wherein the powder further contains a dispersion of fine particles of a product curbing the growth of the grain size, in a proportion per volume less than that which would lead to the formation of a continuous layer of fine particles about the particles of titanium powder, said product particles being present at the surface of the titanium grains in the alloy obtained.
Claim 3
Dependent Claim
24 words
A process according to claim 1, wherein the product is selected among the group consisting of those species chemically stable with respect to titanium.
Claim 4
Dependent Claim
35 words
A process according to claim 1, wherein the product is selected among those chemical species which have at least one element which has a very low solubility in titanium at the temperature of heat treatment.
Claim 5
Dependent Claim
134 words
A process for forming a titanium base alloy having a small grain size, comprising the steps of compacting a powder formed of particles of titanium or of mother alloy thereof, treating at a temperature higher than the point of transformation into phase β and quenching wherein the powder further contains a dispersion of fine particles of a product curbing the growth of the grain size, in a proportion per volume less than that which would lead to the formation of a continuous layer of fine particles about the particles of titanium powder, said product particles being present at the surface of the titanium grains in the alloy obtained, wherein said product is selected from the group consisting of S, P, B, As, Se, Te, Y and lanthanides, as an element and as a compound.
Claim 6
Dependent Claim
134 words
A process for forming a titanium base alloy having a small grain size, comprising the steps of compacting a powder formed of particles of titanium or of mother alloy thereof, treating at a temperature higher than the point of transformation into phase β and quenching wherein the powder further contains a dispersion of fine particles of a product curbing the growth of the grain size, in a proportion per volume less than that which would lead to the formation of a continuous layer of fine particles about the particles of titanium powder, said product particles being present at the surface of the titanium grains in the alloy obtained, wherein said product is selected from the group consisting of S, P, B, As, Se, Te, Y and lanthanides, as an element and as a compound.
Claim 7
Dependent Claim
34 words
A process according to claim 1, wherein said fine particles of said product have a grain size lower by at least two orders of magnitude to the grain size of the particles of titanium.
Claim 8
Dependent Claim
41 words
A process according to claim 1 for manufacturing a TA6V alloy, wherein said heat treatment is carried out at a temperature higher than the point of transformation to β phase by about 50° C. and is followed by a quenching operation.
References Cited (Backward Citations)
US3181947A
Cited
GB887922A
Cited
FR1600154A
Cited
FR2091242A5
Cited
US4134758A
Cited
US4219357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-21 | 1990-01-20 | 1990-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-21 | 1994-01-20 | 1994-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-21 | 1998-01-20 | 1998-07-22 | $7700.00 | Window Closed / Lapsed |