Method for producing low thermal expansion Ni-base superalloy

Details Method for producing low thermal expansion Ni-base superalloy Method for producing low thermal expansion Ni-base superalloy

2005-04-27

2011-12-27

Roe, Jessee R. (Department: 1733)

Metal treatment

Process of modifying or maintaining internal physical...

Heating or cooling of solid metal

C420S449000

Reexamination Certificate

active

08083874

ABSTRACT:
A method for producing a low thermal expansion Ni-base superalloy including the steps of subjecting the alloy to a solution heat treatment under the condition of at a temperature of 1000 to 1200° C. and subjecting the alloy to either a carbide stabilizing treatment for making aggregated carbides on grain boundaries and stabilizing the carbides under the conditions of at a temperature of not less than 850° C. and less than 1000° C. and for 1 to 50 hours, or a carbide stabilizing treatment for making aggregated carbides on grain boundaries and stabilizing the carbides by cooling from the temperature in the solution heat treatment to 850° C. at a cooling rate of 100° C. or less per hour. The method also including the steps of subjecting the alloy to a first aging treatment for precipitating y′ phase under the conditions of at a temperature of 720 to 900° C. and for 1 to 50 hours, and subjecting the alloy to a second aging treatment for precipitating A2B phase under the conditions of at a temperature of 550 to 700° C. and for 5 to 100 hours.

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G. Shen, D. Furrer: Manufacturing of Aerospace Forgings, Journal of Material Processing Technology, 98, 2000, pp. 189-195.

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