Method, alloy and component
AssigneeVolvo Aero Corporation
InventorsDzevad Imamovic, Göran Sjöberg
Life of this patent
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Abstract
A method for heat treating a nickel base alloy includes the steps of: a. heating a nickel base alloy to at least its delta (δ) phase solvus temperature, and lower than its incipient melting temperature for a predetermined time sufficient to dissolve substantially all of the nickel base alloy's delta (δ) phase, and b. cooling the nickel base alloy to a temperature below the gamma prime (υ) precipitation temperature at a rate sufficient to precipitate the alloy's chromium carbide and gamma prime (υ) in a serrated grain boundary.
Claims15
Method for heat treating a nickel base alloy, comprising the steps of:
- a) heating a nickel base alloy to at least its delta (δ) phase solvus temperature, and lower than its incipient melting temperature for a predetermined time sufficient to dissolve substantially all of the nickel base alloy's delta (δ) phase, and
- b) cooling the nickel base alloy to a temperature below the gamma prime (γ1) precipitation temperature at a rate sufficient to precipitate the alloy's chromium carbide and gamma prime (γ1) in a serrated grain boundary.
- wherein the nickel base alloy has the following composition in weight- %:
- Cr 17-21
- C 0.01-0.05
- Mn max 0.35
- Si max 0.35
- P 0.004-0.020
- S max 0.0025
- Mo 2.5-3.1
- Nb 5.2-5.8
- Ti 0.5-1
- Al 1.2-1.7
- Co 8-10
- W 0.8-1.4
- B 0.003-0.008
- Cu max 0.3
- Fe 8-10
- balance Ni and normally occurring impurities.
Method for heat treating a nickel base alloy, comprising the steps of:
- a) heating a nickel base alloy to at least its delta (δ) phase solvus temperature, and lower than its incipient melting temperature for a predetermined time sufficient to dissolve substantially all of the nickel base alloy's delta (δ) phase, and
- b) cooling the nickel base alloy to a temperature below the gamma prime (γ1) precipitation temperature at a rate sufficient to precipitate the alloy's chromium carbide and gamma prime (γ1) in a serrated grain boundary
- c) heating the nickel based alloy at a first aging temperature below the solvus temperatures for the gamma prime phase and the gamma double prime phase to form primary precipitates of the gamma prime and gamma double prime phase.
Method for heat treating a nickel base alloy, comprising:
- heating a nickel base alloy to at least its delta (δ) phase solvus temperature, and lower than its incipient melting temperature for a predetermined time sufficient to dissolve substantially all of the nickel base alloy's delta (δ) phase, and
- cooling the nickel base alloy to a temperature below the gamma prime (γ1) precipitation temperature at a rate sufficient to precipitate the alloy's chromium carbide and gamma prime (γ1) in a serrated grain boundary, and
- cooling the nickel base alloy to a temperature of 650° C. ±14° C. in step b).
Dependencies are inferred from the claim text.