Metal treatment – Process of modifying or maintaining internal physical... – Heating or cooling of solid metal
Patent
1991-12-09
1992-12-01
Dean, R.
Metal treatment
Process of modifying or maintaining internal physical...
Heating or cooling of solid metal
148555, 252 793, B22D 11126
Patent
active
051677342
ABSTRACT:
A process for identificaiton, 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, such as liquid penetration evaluation.
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Metals Handbook, 9th Ed, vol. 5; pp. 563-568; 669-675; 1982.
Allen Robert E.
Berry Thomas F.
Glynn Christopher C.
Mueller Peter W.
Samons Larry R.
Dean R.
General Electric Company
Maria Carmen Santa
Phipps Margery S.
Squillaro Jerome C.
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