US3867208A
Expired / Lapsed
US
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Method for producing annular forgings
Assignee: Individual
•
Filing: 1973-05-21
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Granted: 1975-02-18
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Expires: 1993-05-21
Abstract
Abstract In the process of free forging an ingot made of titanium alloy with an Alpha + Beta structure is subjected to multiple plastic deformation in its axial, radial, and tangential directions with an overall degree of deformation in each of these directions being not less than 60 percent of the total deformation, and with sucessive changing of the direction of the deforming force. On completion of deformation annealing is performed at a temperature somewhat below the temperature of phase transformation of the alloy from Beta to Alpha + Beta structure.
Inventors
- 👤 Nikolai Alexandrovich Grekov
- 👤 Galina Ivanovna Arkovenko
- 👤 Elena Petrovna Silina
- 👤 Natalia Petrovna Shifrina
- 👤 Tamara Nikolaevna Sazonova
- 👤 Vasily Yakovlevich Kleimenov
- 👤 Josif Sholomovich Kvater
- 👤 Moisei Grigorievich Zlatkin
- 👤 Valdislav Alexand Mirmelshtein
- 👤 Alexei Ivanovich Potapov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:49
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/16; C22F1/18; C22F1/183
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
175 words
A METHOD FOR PRODUCING LARGE ANNULAR FORGINGS OF MORE THAN ABOUT 500KG. BY FREELY FORGING AN INGOT MADE OF TITANIUM-BASED ALLOYS WISTH A DOUBLE-PHASE A+B STRUCTURE, THE AMOUNT OF B PHASE BEING UP TO 30 PERCENT, WHICH COMPRISES THE STEPS OF HEATING THE INGOT BEFORE SUCCESSIVE FORGING STEPS, THE FIRST HEATING EXCEEDING BY 50*-80*C THE TEMPERATURE OF PHASE TRANSFORMATION FROM B TO A + B STRUCTURE; SUBJECTING SAID INGOT TO SUCCESSIVE MULTIPLE PLASTIC DEFORMATIONS IN THE AXIAL, RADIAL, AND TANGENTIAL DIRECTIONS OF THE INGOT WITH AN OVERALL DEGREE OF DEFORMATION BEING NOT LESS THAN 60 PERCENT TO FORM A BLANK; DECREASING EACH HEATING STEP DURING SAID DEFORMATION FROM SAID FIRST HEATING TEMPERATURE TO A TEMPERATURE 20*-30*C BELOW THE TEMPERATURE OF SAID PHASE TRANSFORMATION BEFORE THE LAST MENTIONED DEFORMATION, THE TEMPERATURE OF EACH HEATING STEP BEING BETWEEN 950* AND1050*C; AND ANNEALING THE BLANK ON COMPLETION OF SAID PLASTIC DEFORMATION, THE ANNEALING BEING PERFORMED AT A TEMPERATURE SOMEWHAT BELOW SAID TEMPERATURE OF PHASE TRANSFORMATION WHEREBY AT LARGE ANNULAR BLANK HAVING SOLELY A UNIFORM EQUIAXIAL MICROSTRUCTURE IS PRODUCED.
Claim 2
Independent Claim
175 words
A METHOD FOR PRODUCING LARGE ANNULAR FORGINGS OF MORE THAN ABOUT 500KG. BY FREELY FORGING AN INGOT MADE OF TITANIUM-BASED ALLOYS WISTH A DOUBLE-PHASE A+B STRUCTURE, THE AMOUNT OF B PHASE BEING UP TO 30 PERCENT, WHICH COMPRISES THE STEPS OF HEATING THE INGOT BEFORE SUCCESSIVE FORGING STEPS, THE FIRST HEATING EXCEEDING BY 50*-80*C THE TEMPERATURE OF PHASE TRANSFORMATION FROM B TO A + B STRUCTURE; SUBJECTING SAID INGOT TO SUCCESSIVE MULTIPLE PLASTIC DEFORMATIONS IN THE AXIAL, RADIAL, AND TANGENTIAL DIRECTIONS OF THE INGOT WITH AN OVERALL DEGREE OF DEFORMATION BEING NOT LESS THAN 60 PERCENT TO FORM A BLANK; DECREASING EACH HEATING STEP DURING SAID DEFORMATION FROM SAID FIRST HEATING TEMPERATURE TO A TEMPERATURE 20*-30*C BELOW THE TEMPERATURE OF SAID PHASE TRANSFORMATION BEFORE THE LAST MENTIONED DEFORMATION, THE TEMPERATURE OF EACH HEATING STEP BEING BETWEEN 950* AND1050*C; AND ANNEALING THE BLANK ON COMPLETION OF SAID PLASTIC DEFORMATION, THE ANNEALING BEING PERFORMED AT A TEMPERATURE SOMEWHAT BELOW SAID TEMPERATURE OF PHASE TRANSFORMATION WHEREBY AT LARGE ANNULAR BLANK HAVING SOLELY A UNIFORM EQUIAXIAL MICROSTRUCTURE IS PRODUCED.
Claim 3
Dependent Claim
21 words
The method as in claim 1, wherein the first of the forging operations comprises deforming the ingot in the radial direction.
Claim 4
Dependent Claim
144 words
The method as in claim 1, wherein plastic deformation is realized during the forging operations in the following succession and under the following conditions: ingot drawing with a lateral deformation amounting to 30-50 percent of the overall deformation at a temperature which exceeds by 50*-80*C the temperature of phase transformation of the alloy from Beta to Alpha + Beta structure; upsetting with a deformation of 50-70 percent and hole piercing at a temperature exceeding by 30*-50*C said phase transformation temperature; drawing the hollow blank to a deformation of 30-40 percent, expanding with deformation of 20-30 percent, and upsetting with deformation of 10-30 percent at a temperature being 20*-30*C higher than said phase transformation temperature; then drawing the blank with a relative deformation of up to 30 percent and expanding with deformation of 40-50 percent at a temperature from 20*-30*C below said phase transformation temperature.
Claim 5
Dependent Claim
57 words
The method as in claim 3, wherein annealing is carried out by heating the blank to 800*-900*C and keeping it at this temperature for not less than 1 hour, with subsequent complete air cooling; then secondary heating to a temperature of 550*-650*C and maintaining at this temperature for not less than 1 hour; and finally completely cooling.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |