PRODUCTION METHOD FOR RING-ROLLED MATERIAL OF Fe-Ni-BASED SUPER-HEAT-RESISTANT ALLOY

摘要

Provided is a production method for an Fe-Ni-based super-heat-resistant alloy ring-rolled material that is highly circular, suppresses AGG, and has a fine grain structure that has an ASTM grain size number of at least 8. A production method for a ring-rolled material of an Fe-Ni-based super-heat-resistant alloy that has an alloy 718 composition. As ring rolling steps for finishing a ring-shaped ring-rolled raw material that has the abovementioned composition, the production method involves heating the ring-rolled raw material at a temperature of 900°C–980°C and performing finishing ring rolling on the ring-rolled raw material, heating the finishing-ring-rolled ring-rolled material at a temperature of 980°C–1010°C, and using a ring expander to expand the ring-rolled material and correct the ellipticity thereof.