METHOD FOR MANUFACTURING SUPER-REFRACTORY NICKEL-BASED ALLOY AND SUPER-REFRACTORY NICKEL-BASED ALLOY

摘要

The present invention is a method for manufacturing a super-refractory nickel-based alloy with a constituent composition such that the gamma-prime average precipitation quantity at 700°C is at least 35 mol%. This method includes a preparation step in which a material with a crystal grain diameter of 200 µm or less is manufactured by hot extrusion and a processing step in which this material is subjected to cold plastic processing with a processing rate of at least 30%. The cold plastic processing can be performed a plurality of times with a cumulative processing rate of at least 30%, and heat treatment is not performed between instances of cold plastic processing. Moreover, the present invention is a super-refractory nickel-based alloy with a constituent composition such that the gamma-prime average precipitation quantity at 700°C is at least 35 mol%. This alloy can have a linear organization of a gamma phase and a gamma-prime phase or can comprise a carbide aggregated in an isometric crystal organization that includes a gamma phase and a gamma-prime phase.