HOT EXTRUSION-MOLDING METHOD FOR Ni-BASED SUPER HEAT-RESISTANT ALLOY AND PRODUCTION METHOD FOR Ni-BASED SUPER HEAT-RESISTANT ALLOY EXTRUSION MATERIAL

Abstract

A 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 having 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 adjustment is made so the relationship between the outer diameter DB (mm) of the billet at the time of insertion in a container and the inner diameter DC (mm) of the container satisfies (DC-DB): 2-8 mm, or adjustment is made so 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 (DC′−DB′): 3-9 mm. A production method is performed using the hot extrusion-molding method mentioned above.

1 - 5 . (canceled) 
     
     
         6 . A method of manufacturing an extruded material of a precipitation strengthening type super heat resistant Ni-based alloy, wherein an amount of precipitated gamma prime in equilibrium at 700° C. in the Ni-based alloy is not less than 40 mol %, the method comprising:
 heating a billet made of the Ni-based alloy at a hot-working temperature; and 
 inserting the heated billet into a container; and 
 applying a compressive force to the billet from one end of the container to extrude the billet through a hole of a dice at the other end of the container, thereby producing the extruded material of the Ni-based alloy, 
 wherein the method further comprises
 attaching a lubricating glass pad between the dice and the billet, and 
 
 wherein an outer diameter D B  (mm) of the billet and an inner diameter D C  (mm) of the container, when the billet is inserted into the container, have a relationship: (D C −D B )=2 to 8 mm. 
 
     
     
         7 . The method according to  claim 6 , wherein the inner diameter D C  (mm) is 60 to 180 mm. 
     
     
         8 . A method for manufacturing an extruded material made of a precipitation strengthening type heat-resistant Ni-based super alloy, wherein an amount of precipitated gamma prime in equilibrium at 700° C. in the Ni-based alloy is not less than 40 mol %, the method comprising:
 heating a billet of the Ni-based alloy at a hot-working temperature; and 
 inserting the billet heated at the hot-working temperature into a container, container; and 
 applying a compressive force to the billet from one end of the container to extrude the billet from a dice hole at the other end of the container, thereby producing an extruded material of the Ni-based alloy, 
 wherein the method further comprises
 attaching a lubricating glass pad between the dice and the billet, and 
 
 wherein an outer diameter D B ′ (mm) of the billet before heated at the hot-working temperature and an inner diameter D C ′ (mm) of the container before heated at a preheating temperature have a relationship: (D C ′−D B ′)=3 to 9 mm. 
 
     
     
         9 . The method according to  claim 8 , wherein the inner diameter D C ′ (mm) of the container is 60 to 180 mm. 
     
     
         10 . The method according to  claim 6 , wherein the hot-working temperature is 1150 to 1180° C. 
     
     
         11 . The method according to  claim 8 , wherein the hot-working temperature is 1150 to 1180° C.