US4582548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single crystal (single grain) alloy
Assignee: Cannon Muskegon Corp
•
Filing: 1982-01-15
•
Granted: 1986-04-15
•
Expires: 2002-01-15
Abstract
Abstract The alloy is a nickel base, superalloy specifically intended for the making of castings which consist of a single crystal. The castings are intended for use under extreme conditions of high temperature and stress. The alloy, for the first time, achieves the desired characteristics of phase stability, high stress-rupture strength and resistance to oxidation while maintaining a sufficient temperature differential between gamma prime solvus and incipient melting temperatures, that it is practical to solution heat treat without unacceptable percentages of rejects due to failure either to completely solution the primary coarse gamma prime or to initiation of incipient melting. In a modified form the coated oxidation/corrosion resistance of the alloy is increased by the addition of a trace quantity of hafnium.
Inventors
- 👤 Kenneth Harris
- 👤 Gary L. Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:02
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/057; C30; C30B; C30B11/00; C30B29/00; C30B29/10; C30B29/52
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
84 words
A single crystal casting to be used under high stress, high temperature conditions in an oxidizing environment and capable of total primary gamma prime solutioning during heat treatment at a temperature of up to 55° F. below the incipient melting temperature without incipient melting and cast from an alloy having no Hf and consisting essentially of the following elements in the following proportions expressed as percentages of weight: Co: 4.6 Cr: 7.8 Mo: 0.5 W: 8.0 Ta: 6.0 Al: 5.6 Ti: 1.0 Ni: Bal
Claim 2
Dependent Claim
84 words
A single crystal casting to be used under high stress, high temperature conditions in an oxidizing environment and capable of total primary gamma prime solutioning during heat treatment at a temperature of up to 55° F. below the incipient melting temperature without incipient melting and cast from an alloy having no Hf and consisting essentially of the following elements in the following proportions expressed as percentages of weight: Co: 4.6 Cr: 7.8 Mo: 0.5 W: 8.0 Ta: 6.0 Al: 5.6 Ti: 1.0 Ni: Bal
Claim 3
Dependent Claim
86 words
A single crystal casting to be used under high stress, high temperature conditions in an oxidizing environment and capable of total primary gamma prime solutioning during heat treatment at a temperature of up to 55° F. below the incipient melting temperature without incipient melting and cast from an alloy having no Hf and consisting essentially of the following elements in the following range of proportions expressed as percentages of weight: Co: 4.3-4.9 Cr: 7.5-8.2 Mo: 0.3-0.7 W: 7.6-8.4 Ta: 5.8-6.2 Al: 5.45-5.75 Ti: 0.8-1.2 Ni: Balance
Claim 4
Dependent Claim
86 words
A single crystal casting to be used under high stress, high temperature conditions in an oxidizing environment and capable of total primary gamma prime solutioning during heat treatment at a temperature of up to 55° F. below the incipient melting temperature without incipient melting and cast from an alloy having no Hf and consisting essentially of the following elements in the following range of proportions expressed as percentages of weight: Co: 4.3-4.9 Cr: 7.5-8.2 Mo: 0.3-0.7 W: 7.6-8.4 Ta: 5.8-6.2 Al: 5.45-5.75 Ti: 0.8-1.2 Ni: Balance
Claim 5
Dependent Claim
44 words
The casting described in either claims 1 or 2 wherein each of the following elements as unintentional additions may be present in the alloy in the proportion of parts per million maximum: C: 60 Zr: 50 Hf: 50 B: 30 S: 20 Si 400
Claim 6
Dependent Claim
44 words
The single crystal casting described in either claims 1 or 2 wherein the alloy from which it was cast is characterized by a heat treatment "window" of 50°-55° F., an incipient melting point of 2435°-2440° F. and a gamma prime solvus of 2385° F.
Claim 7
Dependent Claim
33 words
The casting described in claim 4 further characterized the alloy from which it was cast is capable of total solution of its gamma prime in three hours of heat treatment at 2400° F.
Claim 8
Dependent Claim
49 words
The casting described in claim 4 wherein the alloy from which it is cast is characterized by resistance to precipitation of constituent elements and the formation of deleterious plate-like and/or acicular precipitates during continuous exposure to temperatures in the range of 1600° F.-2000° F. for long periods of time.
Claim 9
Dependent Claim
113 words
A single crystal blade or vane for a gas turbine engine cast from an alloy having no Hf and characterized by a heat treatment "window" of 50°-55° F., an incipient melting point of 2435°-2440° F., a gamma prime solvus of 2385° F. and capable of total primary gamma prime solutioning at 2400° F. and freedom from the precipitation of deleterious plate-like and/or acicular and particulate precipitates during 1000 hours of continuous exposure at temperatures in excess of 1800° F. and consisting essentially of the following range of elements in the following proportions expressed as percentages of weight: Co: 4.3-4.9 Cr: 7.5-8.2 Mo: 0.3-0.7 W: 7.6-8.4 Ta: 5.8-6.2 Al: 5.45-5.75 Ti: 0.8-1.2 Ni: Balance
Claim 10
Dependent Claim
113 words
A single crystal blade or vane for a gas turbine engine cast from an alloy having no Hf and characterized by a heat treatment "window" of 50°-55° F., an incipient melting point of 2435°-2440° F., a gamma prime solvus of 2385° F. and capable of total primary gamma prime solutioning at 2400° F. and freedom from the precipitation of deleterious plate-like and/or acicular and particulate precipitates during 1000 hours of continuous exposure at temperatures in excess of 1800° F. and consisting essentially of the following range of elements in the following proportions expressed as percentages of weight: Co: 4.3-4.9 Cr: 7.5-8.2 Mo: 0.3-0.7 W: 7.6-8.4 Ta: 5.8-6.2 Al: 5.45-5.75 Ti: 0.8-1.2 Ni: Balance
Claim 11
Dependent Claim
25 words
A gas turbine engine blade or vane as claimed in claim 7 solution treated at 2400° F. for three hours and then gas fan quenched.
Claim 12
Dependent Claim
19 words
The casting as claimed in either claims 1 or 2 cast as a blade for a gas turbine engine.
Claim 13
Dependent Claim
19 words
The casting as claimed in either claims 1 or 2 cast as a vane for a gas turbine engine.
Claim 14
Dependent Claim
94 words
A single crystal super alloy casting for use in a gas turbine engine cast from an alloy having no Hf and consisting essentially of the elements expressed as percentage of weight Co 4.3-4.9, Cr 7.5-8.2, mo 0.3-0.7, W 7.6-8.4, Ta 5.8-6.2, Al 5.45-5.75, Ti 0.8-1.2, balance Ni and as cast having an incipient melting temperature approximately 50° F. (27.8° C.) higher than its gamma prime solvus temperature, said casting being capable of heat treatment at a temperature and for a time period sufficient to solutionize all its primary gamma prime without any incipient melting.
Claim 15
Dependent Claim
94 words
A single crystal super alloy casting for use in a gas turbine engine cast from an alloy having no Hf and consisting essentially of the elements expressed as percentage of weight Co 4.3-4.9, Cr 7.5-8.2, mo 0.3-0.7, W 7.6-8.4, Ta 5.8-6.2, Al 5.45-5.75, Ti 0.8-1.2, balance Ni and as cast having an incipient melting temperature approximately 50° F. (27.8° C.) higher than its gamma prime solvus temperature, said casting being capable of heat treatment at a temperature and for a time period sufficient to solutionize all its primary gamma prime without any incipient melting.
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) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |