Ni based superalloy, member of Ni based superalloy, and method for producing same
First Claim
1. A manufacturing process of a Ni based superalloy softening material comprising:
- a step for preparing a raw material of a Ni-based superalloy, the raw material of a Ni-based superalloy being subjected to a softening step in a next step;
a step for softening the raw material of the Ni based superalloy and improving workability, the step being performed subsequently to the step for preparing a raw material of a Ni-based superalloy, whereinthe step for softening the Ni based superalloy and improving workability is a step for precipitating a gamma prime phase that is incoherent with a gamma phase that is a matrix of the Ni based superalloy by 20 vol % or more, and the step of softening the Ni based superalloy and improving workability comprises;
a first step for hot-forging the Ni based superalloy at a temperature below the solvus of the gamma prime phase; and
a second step, being performed subsequently to the first step, for precipitating the gamma prime phase that is incoherent with a gamma phase that is a matrix by 20 vol % or more by slow cooling at equal to or more than 10°
C./h and equal to or less than 100°
C./h from a temperature below the solvus of the gamma prime phase and increasing the amount of the gamma prime incoherent phase,wherein the solvus of the gamma prime phase is 1,050°
C. or above; and
further comprising a step of cooling the Ni based superalloy by quenching after the second step.
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Abstract
To provide a manufacturing process of a Ni based superalloy and a member of the Ni based superalloy which achieves both of excellent workability in a manufacturing step of the Ni based superalloy of the precipitation strengthening type which contains much amount of the gamma prime phase and excellent high temperature strength of the Ni based superalloy. The manufacturing process of a Ni based superalloy includes a step for softening the Ni based superalloy and improving the workability, in which the step for softening the Ni based superalloy and improving the workability is a step for precipitating the gamma prime phase that is incoherent with a gamma phase that is a matrix by 20 vol % or more.
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Citations
5 Claims
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1. A manufacturing process of a Ni based superalloy softening material comprising:
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a step for preparing a raw material of a Ni-based superalloy, the raw material of a Ni-based superalloy being subjected to a softening step in a next step; a step for softening the raw material of the Ni based superalloy and improving workability, the step being performed subsequently to the step for preparing a raw material of a Ni-based superalloy, wherein the step for softening the Ni based superalloy and improving workability is a step for precipitating a gamma prime phase that is incoherent with a gamma phase that is a matrix of the Ni based superalloy by 20 vol % or more, and the step of softening the Ni based superalloy and improving workability comprises; a first step for hot-forging the Ni based superalloy at a temperature below the solvus of the gamma prime phase; and a second step, being performed subsequently to the first step, for precipitating the gamma prime phase that is incoherent with a gamma phase that is a matrix by 20 vol % or more by slow cooling at equal to or more than 10°
C./h and equal to or less than 100°
C./h from a temperature below the solvus of the gamma prime phase and increasing the amount of the gamma prime incoherent phase,wherein the solvus of the gamma prime phase is 1,050°
C. or above; and
further comprising a step of cooling the Ni based superalloy by quenching after the second step. - View Dependent Claims (2, 3, 4, 5)
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Specification