Claims
- 1. 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.degree. 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
- 2. 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.degree. 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
- 3. 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
- 4. 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.degree.-55.degree. F., an incipient melting point of 2435.degree.-2440.degree. F. and a gamma prime solvus of 2385.degree. F.
- 5. 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.degree. F.
- 6. 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.degree. F.-2000.degree. F. for long periods of time.
- 7. 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.degree.-55.degree. F., an incipient melting point of 2435.degree.-2440.degree. F., a gamma prime solvus of 2385.degree. F. and capable of total primary gamma prime solutioning at 2400.degree. 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.degree. 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
- 8. A gas turbine engine blade or vane as claimed in claim 7 solution treated at 2400.degree. F. for three hours and then gas fan quenched.
- 9. The casting as claimed in either claims 1 or 2 cast as a blade for a gas turbine engine.
- 10. The casting as claimed in either claims 1 or 2 cast as a vane for a gas turbine engine.
- 11. 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.degree. F. (27.8.degree. 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.
Parent Case Info
This application is a continuation in part of U.S. patent application, Ser. No. 209 501, entitled "Single Crystal (Single Grain) Alloy" filed Nov. 24, 1980, abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4116723 |
Gell et al. |
Sep 1978 |
|
4209348 |
Duhl et al. |
Jun 1980 |
|
4402772 |
Duhl et al. |
Sep 1983 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
209501 |
Nov 1980 |
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