Ni-based forged alloy material and turbine high-temperature member using the same

摘要

An object of the present invention is to provide a Ni-based forged alloy material in which a tensile strength and a creep property are balanced at a higher level than before using an ultra-strong precipitation-strengthened Ni-based alloy and a turbine high-temperature member using the same. . The Ni-based forged alloy material according to the present invention has a chemical composition in which a γ ′ phase of 50 volume% or more and 70 volume% or less is precipitated in a matrix phase of a γ phase at a temperature of 700 ° C., An aging precipitation γ 'phase grain that precipitates in the crystal grains of the γ phase and a eutectic reaction γ' phase grain that precipitates between the crystal grains of the γ phase. And the Al content is higher than that of the aging precipitation γ ′ phase grains, and the average grain size is 2 μm or more and 40 μm or less.