Supersolvus hot isostatic pressing and ring rolling of hollow powder forms

Abstract

An annular metallic article is fabricated by loading a metallic powder into a fill volume of a can, compacting the metallic powder by hot isostatic pressing the metallic powder within the can at a temperature above the precipitate solvus temperature and below the solidus temperature of the metallic powder to form a compacted powder mass, and ring rolling the compacted powder mass to form the metallic article having the annular circular shape.

1 . A method for fabricating an annular metallic article, comprising the steps of 
 providing a can having an outer wall, an inner wall, and a fill volume between the outer wall and the inner wall;    loading a metallic powder into the fill volume, wherein the metallic powder is of a composition that has a precipitate solvus temperature and a solidus temperature greater than the precipitate solvus temperature;    compacting the metallic powder at a temperature between the precipitate solvus temperature and the solidus temperature to form a compacted powder mass; and    ring rolling the compacted powder mass to form the annular metallic article.    
     
     
         2 . The method of  claim 1 , wherein the step of loading includes the step of 
 providing the metallic powder made of a pre-alloyed nickel-base superalloy having a gamma prime precipitate solvus temperature.    
     
     
         3 . The method of  claim 1 , wherein the step of loading includes the step of 
 providing the metallic powder made of a pre-alloyed nickel-base superalloy having a gamma prime precipitate solvus temperature, and the step of compacting includes the step of    compacting the metallic powder above the gamma prime precipitate solvus temperature.    
     
     
         4 . The method of  claim 1 , wherein the step of loading includes the step of 
 providing a metallic-powder composition having too high a strength and too low a malleability to be fabricated into an annular metallic article by casting and upset forging.    
     
     
         5 . The method of  claim 1 , wherein the step of compacting includes the step of 
 hot isostatic pressing the can with the metallic powder therein.    
     
     
         6 . The method of  claim 1 , wherein the method includes no press forging, no extrusion, and no upset forging.  
     
     
         7 . The method of  claim 1 , wherein the step of ring rolling includes the step of 
 ring rolling the compacted powder mass at a temperature below the precipitate solvus temperature.    
     
     
         8 . The method of  claim 1 , wherein the step of ring rolling includes the step of 
 ring rolling the compacted powder mass to an annular circular shape.    
     
     
         9 . The method of  claim 1 , wherein the step of ring rolling includes the step of 
 ring rolling the compacted powder mass to an annular circular shape having a ratio of an inner diameter to an outer diameter of greater than 0.75 and less than 1.0.    
     
     
         10 . The method of  claim 1 , including an additional step, after the step of compacting and before the step of ring rolling, of 
 removing the compacted powder mass from the can.    
     
     
         11 . The method of  claim 1 , including an additional step, after the step of ring rolling, of 
 removing the annular metallic article from the can.    
     
     
         12 . The method of  claim 1 , including an additional step, after the step of ring rolling, of 
 heat treating the annular metallic article.    
     
     
         13 . A method for fabricating an annular metallic article, comprising the steps of 
 providing a can having a cylindrical outer wall, a cylindrical inner wall, and a fill volume between the outer wall and the inner wall;    loading a metallic powder into the fill volume, wherein the metallic powder is a pre-alloyed nickel-base superalloy having a gamma prime precipitate solvus temperature and a solidus temperature, and wherein the solidus temperature is greater than the gamma prime precipitate solvus temperature;    compacting the metallic powder by hot isostatic pressing within the can at a temperature above the gamma prime precipitate solvus temperature and below the solidus temperature to form a compacted powder mass; and    ring rolling the compacted powder mass to form the metallic article having an annular circular shape.    
     
     
         14 . The method of  claim 13 , wherein the step of ploading includes the step of 
 providing a metallic-powder composition having too high a strength and too low a malleability to be fabricated into an annular metallic article by casting and upset forging.    
     
     
         15 . The method of  claim 13 , wherein the step of ring rolling includes the step of 
 ring rolling the compacted powder mass at a temperature below the gamma prime precipitate solvus temperature.    
     
     
         16 . The method of  claim 13 , wherein the step of ring rolling includes the step of 
 ring rolling the compacted powder mass to the annular circular shape having a ratio of an inner diameter to an outer diameter of greater than 0.75 and less than 1.0.    
     
     
         17 . The method of  claim 13 , including an additional step, after the step of compacting and before the step of ring rolling, of 
 removing the compacted powder mass from the can.    
     
     
         18 . The method of  claim 13 , including an additional step, after the step of ring rolling, of 
 removing the metallic article from the can.    
     
     
         19 . The method of  claim 13 , including an additional step, after the step of ring rolling, of 
 heat treating the metallic article.    
     
     
         20 . The method of  claim 13 , wherein the method includes no press forging, no extrusion, and no upset forging.