PROCÉDÉ DE MOULAGE PAR EXTRUSION À CHAUD POUR ALLIAGE À BASE DE NI TRÈS RÉSISTANT À LA CHALEUR ET PROCÉDÉ DE PRODUCTION D'UN MATÉRIAU D'EXTRUSION D'ALLIAGE À BASE DE NI TRÈS RÉSISTANT À LA CHALEUR

摘要

Provided are: a hot extrusion-molding method for a precipitation strengthened-type Ni-based super heat-resistant alloy; and a production method for a Ni-based super heat-resistant alloy extrusion material. The hot extrusion-molding method is for a Ni-based super heat-resistant alloy, wherein: a billet has a component composition for a precipitation strengthened-type Ni-based super heat-resistant alloy which has a gamma prime phase equilibrium precipitation amount of 40 mol% or more at 700°C; a lubrication glass pad is installed between a die and the billet; and an adjustment is made such that the relationship between the outer diameter DB (mm) of the billet at the time of being inserted in a container and the inner diameter DC (mm) of the container satisfies the condition, (DC-DB): 2-8 mm, or an adjustment is made such that the relationship between the outer diameter DB' (mm) of the billet prior to being heated to a hot processing temperature and the inner diameter DC' (mm) of the container prior to being heated to a preheating temperature satisfies the condition, (DC'-DB'): 3-9 mm. The production method for a Ni-based super heat-resistant alloy extrusion material is performed using the hot extrusion-molding method mentioned above.