Integrally Rotating Machinery and Method and Apparatus for Achieving the Same

Abstract

An article formed with blading members comprising a rotor a a plurality of blading members integrally formed with the rotor wherein each blading member having continuous zones of compressive residual stress on the pressure side and the suction side and extending substantially along the perimeter and extending inwards, towards the center of each blading member, and wherein the continuous zones of compressive residual stress have an improved surface finish.

1 . An article having blading members comprising:
 a rotor having a plurality of blading members integrally formed with said rotor, each said blading member having a pressure side and a suction side in opposition to one another and a perimeter defined by a leading edge, trailing edge, and a tip of said blading member;   wherein said blading members have continuous zones of compressive residual stress on said pressure side and said suction side of each blading member, said continuous zones of compressive residual stress extending substantially along said perimeter of said blading member and extending inwards, towards the center of said blading member;   wherein said continuous zones of compressive residual stress have an improved surface finish.   
     
     
         2 . The article of  claim 1  wherein said improved surface finish is in the range of about 5 μin. to about 20 μin 
     
     
         3 . The article of  claim 1  wherein said continuous compressive zones of compressive residual stress extend substantially through the thickness of the blading member. 
     
     
         4 . The article of  claim 1  wherein said continuous compressive zones of compressive residual stress operate to offset areas of residual tensile stress and high applied stresses that occur during operation of the blading member. 
     
     
         5 . The article of  claim 1  wherein said continuous compressive zones of compressive residual stress operate to mitigate foreign object damage during operation of the blading member. 
     
     
         6 . The article of  claim 1  wherein said continuous compressive zones of compressive residual stress has an associated cold work on the order of less than about 5%. 
     
     
         7 . The article of  claim 1  wherein said continuous compressive zones of compressive residual stress has an associated cold work on the order of less than about 3.5%.