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Ni based superalloy, member of Ni based superalloy, and method for producing same

  • US 10,557,189 B2
  • Filed: 06/17/2015
  • Issued: 02/11/2020
  • Est. Priority Date: 06/18/2014
  • Status: Active Grant
First Claim
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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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