C - Chemistry – Metallurgy – 23 – F
Patent
C - Chemistry, Metallurgy
23
F
13/1, 22/191, 14
C23F 17/00 (2006.01) B21J 5/00 (2006.01) B22D 31/00 (2006.01) C21D 7/13 (2006.01) C21D 10/00 (2006.01) C22F 1/00 (2006.01) C22F 1/10 (2006.01)
Patent
CA 2034370
13DV-9768 ABSTRACT A process for identification, evaluation and removal of microshrinkage of investment cast superalloy parts and parts produced by the process. Parts free of deleterious microshrinkage capable of longer life at existing stress levels or use at higher alternating stresses are produced by first subjecting the parts to hot isostatic pressing to eliminate nonsurface connected subsurface microshrinkage. Next, in order to expose near-surface microshrinkage microscopically connected to the surface, the parts are immersed in an acid solution for a time sufficient to uniformly remove at least about 0.005 inches of the original as cast surface. The exposed microshrinkage is evaluated for acceptability or removal by standard nondestructive techniques.
Allen Robert E.
Berry Thomas F.
Glynn Christopher C.
Mueller Peter W.
Samons Larry R.
Company General Electric
Craig Wilson And Company
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