Ni-Based Alloy Product and Method for Producing Same, and Ni-Based Alloy Member and Method for Producing Same

A method for producing an Ni-based alloy product having a two-phase structure composed of crystalline grains of a γ phase and crystalline grains of the γ′ phase, in which the γ′ phase is an incoherent γ′ phase being located through γ phase grain boundaries of an incoherent interface, and in which the incoherent γ′ phase is present at a ratio of 20 volume % or higher in the two-phase structure, the method comprising:

• the step of melting and casting a first Ni-based alloy material to produce a second Ni-based alloy material;
• and
• the step of hot-forging the second Ni-based alloy material obtained through the melting and casting step at temperatures equal to or higher than 1000° C. and wherein the γ and the γ′ phases coexist to produce a third Ni-based alloy material having an ingredient composition in which a γ′ phase at a ratio of 36 to 60 volume % can be precipitated in a temperature range of 700 to 900° C.;
• and
• the step of forming the Ni-based alloy product from the third Ni-based alloy material.