Powder metallurgy method for producing non-molybdenum segregated article

Abstract

A powder metallurgy method for producing a non-molybdenum-segregated article is disclosed. The method includes use of a Ni—Mo—Cr powder that has a composition in which Ni is the base element and the Mo and Cr are alloy elements. The composition comprises, by weight, at least 20% of the Mo, and the Mo is dispersed in the Ni—Mo—Cr powder. The Ni—Mo—Cr powder is inserted into a hermetic chamber of a canister, followed by evacuating the hermetic chamber. The canister with the Ni—Mo—Cr powder in the hermetic chamber is then subjected to a hot isostatic pressing process that includes heating the canister and the Ni—Mo—Cr powder and applying isostatic pressure to the canister. The heating and the isostatic pressure causes fusion and consolidation of the Ni—Mo—Cr powder to form a solid article. The Mo remains dispersed such that the solid article is non-molybdenum-segregated. The canister is then removed from the solid article.

What is claimed is: 
     
         1 . A powder metallurgy method for producing a non-molybdenum-segregated article, the method comprising:
 a Ni—Mo—Cr powder that has a composition in which Ni is the base element and the Mo and the Cr are alloy elements, the composition comprises, by weight, at least 20% of the Mo, and the Mo is dispersed in the Ni—Mo—Cr powder;   inserting the Ni—Mo—Cr powder into a hermetic chamber of a canister, followed by evacuating the hermetic chamber;   subjecting the canister with the Ni—Mo—Cr powder in the hermetic chamber to a hot isostatic pressing process that includes heating the canister and the Ni—Mo—Cr powder and applying isostatic pressure to the canister, the heating and the isostatic pressure causing fusion and consolidation of the Ni—Mo—Cr powder to form a solid article, the Mo remaining dispersed such that the solid article is non-molybdenum-segregated; and   removing the canister from the solid article.   
     
     
         2 . The method as recited in  claim 1 , wherein the composition comprises, by weight, 24% to 26% of the Mo. 
     
     
         3 . The method as recited in  claim 2 , wherein the composition comprises, by weight, 7% to 9% of the Cr. 
     
     
         4 . The method as recited in  claim 1 , further comprising forming one or more end-use components from the solid article. 
     
     
         5 . The method as recited in  claim 1 , further comprising forming the Ni—Mo—Cr powder. 
     
     
         6 . An end-use component formed from the solid article produced by the method as recited in any of the prior claims. 
     
     
         7 . A powder metallurgy method for producing a non-molybdenum-segregated article, the method comprising:
 forming a Ni—Mo—Cr powder that has a composition in which Ni is the base element and the Mo and the Cr are alloy elements, the composition comprises, by weight, at least 20% of the Mo, and the Mo is dispersed in the Ni—Mo—Cr powder;   inserting the Ni—Mo—Cr powder into a hermetic chamber of a canister, followed by evacuating the hermetic chamber;   subjecting the canister with the Ni—Mo—Cr powder in the hermetic chamber to a hot isostatic pressing process that includes heating the canister and the Ni—Mo—Cr powder and applying isostatic pressure to the canister, the heating and the isostatic pressure causing fusion and consolidation of the Ni—Mo—Cr powder to form a solid article, the Mo remaining dispersed such that the solid article is non-molybdenum-segregated;   removing the canister from the solid article; and   forming one or more end-use components from the solid workpiece.   
     
     
         8 . The method as recited in  claim 7 , wherein the composition comprises, by weight, 24% to 26% of the Mo. 
     
     
         9 . The method as recited in  claim 8 , wherein the composition comprises, by weight, 7% to 9% of the Cr. 
     
     
         10 . The method as recited in  claim 7 , wherein the forming includes extruding the solid article. 
     
     
         11 . The method as recited in  claim 7 , wherein the forming includes cutting the solid article into pieces. 
     
     
         12 . The method as recited in  claim 7 , wherein the forming includes forging the solid article. 
     
     
         13 . The method as recited in  claim 7 , wherein the forming includes extruding the solid article into a billet, cutting the billet into pieces, and forging the pieces.