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US 11,453,939 B2Granted
Heat treatments for improved ductility of Ni—Cr—Co—Mo—Ti—Al alloys
AssigneeHaynes International, Inc.
InventorLee Pike
Life of this patent
Estimating the term…
Abstract
In a method for heat treating alloy compositions within UNS N07028 the alloy composition is heated at a temperature between 1550° F. and 1750° F. for at least two hours, and then heated at a lower temperature between 1300° F. and 1550° F. for at least two hours. The alloy composition may be heated at a temperature between 1850° F. and 1950° F. for at least one hour before heating the alloy composition at a temperature between 1550° F. and 1750° F.
Claims17
A method for heat treating alloy compositions containing in weight percent:
- 18.5 to 20.5
- chromium
- 9.0 to 11.0
- cobalt
- 8.0 to 9.0
- molybdenum
- 1.38 to 1.65
- aluminum
- up to 1.5
- iron
- 1.90 to 2.30
- titanium
- 0.04 to 0.08
- carbon
- up to 0.15
- silicon
- up to 0.015
- phosphorus
- up to 0.015
- sulfur
- 0.003 to 0.010
- boron
- up to 0.2
- niobium
- up to 0.5
- tungsten
- up to 0.1
- tantalum
- up to 0.1
- copper
- up to 0.3
- manganese
- up to 0.1
- zirconium
- balance
- nickel
- comprising:
- heating the alloy composition at a temperature between 1550° F. and 1750° F. for at least two hours, and
- then heating the alloy composition at a lower temperature between 1300° F. and 1550° F. for at least two hours,
- thereby forming an alloy composition having a complex grain boundary layer containing gamma prime and M23C6 carbide.
37 more elements
Dependencies are inferred from the claim text.