Manufacturing method of Ni-based super heat-resistant alloy and Ni-based super heat-resistant alloy

摘要

Provided are a method for producing a Ni-based superheat-resistant alloy having a component composition in which the equilibrium precipitation amount of the gamma prime phase at 700 ° C. is 35 mol% or more, and a Ni-based superheat-resistant alloy. The method of the present invention is for (a) a material having a component composition having a carbon content of 0.05 to 0.25% by mass and an equilibrium precipitation amount of the gamma prime phase at 700 ° C. of 35 mol% or more. , The step of producing the first processed material by cooling after performing plastic working at a temperature of 900 ° C. or higher, and (b) heating the first processed material to a temperature of 900 ° C. or higher to perform heat treatment. The step of producing the first heat-treated material is included. Further, (c) a step of plastically working the first heat-treated material at a temperature of 500 ° C. or lower to produce a second processed material is further included. The present invention is for cold plastic working, has the above-mentioned component composition, has an area ratio of M23C6 of 4.0 area% or less in a cross-sectional structure, and has an average particle size of the maximum diameter of crystal grains of 1. It is a Ni-based super heat-resistant alloy of 4 to 100 μm.