Nickel-Based Alloy Regenerated Member and Method for Manufacturing Same

A method for manufacturing a regenerated member of a nickel-based alloy member for use in a turbine,

• the nickel-based alloy member being a nickel-based alloy unidirectional solidification article or single crystalline solidification article comprising a γ phase as a matrix and a γ′ phase precipitating in the γ phase in a volume fraction of 30 volume % or more in an operational environment of the turbine,
• the method comprising:
• a solution/non-recrystallization heat treatment step of subjecting a used member to a solution/non-recrystallization heat treatment in which the used member is held at a temperature at least 10° C. higher than the solvus temperature of the γ′ phase but not higher than a temperature that is 10° C. lower than the melting point of the γ phase, for a holding duration within a time range in which recrystallized grains of the γ phase do not generate, the used member being the nickel-based alloy member having operated for a predetermined period of time in the turbine;
• and
• an aging heat treatment step of subjecting the used member having undergone the solution/non-recrystallization heat treatment to allow the γ′ phase to precipitate in the γ phase,
• wherein when a rocking curve of a predetermined crystal face of the γ phase crystal grain of the used member undergone the solution/non-recrystallization heat treatment step is measured by an X-ray diffraction technique, a full width at half maximum of the rocking curve is within a range from 0.25° to 0.30°.