Patent US3891431A successfully refreshed from Google Patents.
US3891431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of, and apparatus for, controlling the crystalline structure of alloys, and alloys so produced
Assignee: BBC Brown Boveri AG Germany
•
Filing: 1972-04-17
•
Granted: 1975-06-24
•
Expires: 1992-04-17
Abstract
Abstract The crystalline structure of an alloy having a structure which is at least partially eutectic is controllable by heat-treatment, by forming in a body of the alloy a zone of high temperature gradient between a melting region and an adjacent solidification region. The rate of progress of said high temperature gradient over the body may be controlled whereby to influence a predetermined crystallization in the matrix of the eutectic.
Inventors
- 👤 Peter Sahm
- 👤 Renata Sebalj-Novosel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:56
CPC Classifications
C; C22; C22F; C22F1/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
119 words
IN A METHOD OF CONTROLLING BY HEAT TREATMENT THE CRYSTALLINE STRUCTURE OF AN AT LEAST PARTIALLY EUTECTIC ALLOY HAVING A CRYSTALLINE (CR,ME)-C3 PHASE EMBEDDED IN A ME-CHROMIUMCARBON MATRIX PHASE, WHEREIN ME IS SELECTED FROM THE GROUP CONSISTING OF FE, CO, NI, MN AND COMBINATIONS THEREOF, WHEREIN ONE OF SAID PHASE IS AT LEAST SUBSTANTIALLY ISOTROPIC, AND THE OTHER PHASE IS CHARACTERIZED BY A HIGHLY ANISOTROPIC CRYSTALLINE STRUCTURE, THE IMPROVEMENT COMPRISING SYMMETRIZING SAID STRUCTURE BY PASSING SAID BODY THROUGH A MELTING ZONE AND A SOLIDIFICATION ZONE WHEREIN THE TEMPERATURE GRADIENT BETWEEN THE MELTING ZONE AND THE SOLIDIFICATION ZONE IS AT LEAST 2,500*C/CM, AND WHEREIN THE SPEED OF SAID BODY IS ADVANCED THROUGH SAID ZONES IS A RATE OF FROM 1-100CM/HR.
Claim 2
Dependent Claim
119 words
IN A METHOD OF CONTROLLING BY HEAT TREATMENT THE CRYSTALLINE STRUCTURE OF AN AT LEAST PARTIALLY EUTECTIC ALLOY HAVING A CRYSTALLINE (CR,ME)-C3 PHASE EMBEDDED IN A ME-CHROMIUMCARBON MATRIX PHASE, WHEREIN ME IS SELECTED FROM THE GROUP CONSISTING OF FE, CO, NI, MN AND COMBINATIONS THEREOF, WHEREIN ONE OF SAID PHASE IS AT LEAST SUBSTANTIALLY ISOTROPIC, AND THE OTHER PHASE IS CHARACTERIZED BY A HIGHLY ANISOTROPIC CRYSTALLINE STRUCTURE, THE IMPROVEMENT COMPRISING SYMMETRIZING SAID STRUCTURE BY PASSING SAID BODY THROUGH A MELTING ZONE AND A SOLIDIFICATION ZONE WHEREIN THE TEMPERATURE GRADIENT BETWEEN THE MELTING ZONE AND THE SOLIDIFICATION ZONE IS AT LEAST 2,500*C/CM, AND WHEREIN THE SPEED OF SAID BODY IS ADVANCED THROUGH SAID ZONES IS A RATE OF FROM 1-100CM/HR.
Claim 3
Dependent Claim
30 words
The method of claim 1, wherein said metal is cobalt and wherein the total composition of the resulting cobalt-chromium-carbon alloy lies within the following corner compositions in percentages by weight:
Claim 4
Dependent Claim
15 words
The method of claim 1, wherein the upper limit of the temperature gradient is 10,000*C/cm.
References Cited (Backward Citations)
US3124452A
Cited
US2739088A
Cited
US2719799A
Cited
US3060123A
Cited
US3030194A
Cited
US2855335A
Cited
US3498851A
Cited
US3536540A
Cited
US3496033A
Cited
US3564940A
Cited
US3552953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |