US4003765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat treatment of cobalt base alloys
Assignee: Imphy SA
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Filing: 1974-10-01
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Granted: 1977-01-18
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Expires: 1994-10-01
Abstract
Abstract Cobalt based alloy containing 5% to 30% Ni; 18% to 25% Cr; 5% to 17% of at least one of W, Ta and Mo; 0.10% to 0.30% C; 50 ppm to 200 ppm B; 0 to 0.3% Fe; 0 to 2% Mn; 0 to 1% HF; 0 to 1% La; 0 to 1% Y; 0.5% to 2% in total of Ti and/or Nb, the balance being Co; and a heat treatment for such alloy comprising solution heat treatment in a protective atmosphere at 1150° C to 1250° C for at least 1 hour, rapid cooling, and then age hardening for from 12 to 24 hours at from 750° C to 850° C to effect carbide precipitation of MC carbides, M being titanium or niobium.
Inventors
- 👤 James H. Davidson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:28
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
148 words
A process of heat treating an alloy consisting in: preparing an alloy consisting of, in percentages by weight, from 5 to 30% nickel from 18 to 25% chromium, from 5 to 17% in total of one or more of tungsten, tantalum, and molybdenum, from 0.10 to 0.30% carbon, from 50 to 200 ppm boron, from 0 to 0.3% iron from 0 to 2% manganese, from 0 to 1% hafnium, from 0 to 1% lanthanum, from 0 to 1% yttrium, from 0.5 to 2% in total of titanium and/or niobium, the balance being cobalt and incidental impurities, solution heat treating the alloy in a protective atmosphere at from 1150° to 1250° C for at least 1 hour, and rapid cooling and then age hardening for from 12 to 24 hours at from 750° C to 850° C, to effect carbide precipitation of MC carbides, M being titanium or niobium.
Claim 2
Dependent Claim
148 words
A process of heat treating an alloy consisting in: preparing an alloy consisting of, in percentages by weight, from 5 to 30% nickel from 18 to 25% chromium, from 5 to 17% in total of one or more of tungsten, tantalum, and molybdenum, from 0.10 to 0.30% carbon, from 50 to 200 ppm boron, from 0 to 0.3% iron from 0 to 2% manganese, from 0 to 1% hafnium, from 0 to 1% lanthanum, from 0 to 1% yttrium, from 0.5 to 2% in total of titanium and/or niobium, the balance being cobalt and incidental impurities, solution heat treating the alloy in a protective atmosphere at from 1150° to 1250° C for at least 1 hour, and rapid cooling and then age hardening for from 12 to 24 hours at from 750° C to 850° C, to effect carbide precipitation of MC carbides, M being titanium or niobium.
Claim 3
Dependent Claim
41 words
A process of preparing an alloy according to claim 1, in which the additions of carbon, niobium and titanium are chosen so that the ratio (Ti + Nb)/C is substantially equal to one when the additions are expressed in atomic percentage.
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) | 1980-01-18 | 1980-07-19 | 1981-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-18 | 1984-07-19 | 1985-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-18 | 1988-07-19 | 1989-01-18 | $7700.00 | Window Closed / Lapsed |