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US 4,300,980 AGranted
Overlapping double etch technique for evaluation of metallic alloys to stress corrosion cracking
AssigneeThe United States of America as represented by the United States Department of Energy
InventorsArthur F. Steeves, James C. Stewart
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Abstract
A double overlapping etch zone technique for evaluation of the resistance of metallic alloys to stress corrosion cracking. The technique involves evaluating the metallic alloy along the line of demarcation between an overlapping double etch zone and single etch zone formed on the metallic alloy surface.
Claims8
A method for evaluating metallic alloy substrates for resistance to stress corrosion cracking comprising:
- (a) applying an etch resistant masking material to a preselected area of said substrate leaving another area of said substrate uncoated,
- (b) etching said uncoated area with a material suitable to delineate the grain boundaries on said substrate,
- (c) removing the etch resistant masking material thereby obtaining a substrate possessing etched and non-etched surface areas,
- (d) etching the uncoated areas with a material suitable to determine the location of the carbide precipitates on said substrate thereby establishing an overlapping double etch zone and a single etch zone, and
- (e) evaluating said substrate for resistance to stress corrosion cracking by examining said substrate along the line of demarcation established between the overlapping double etch zone and single etch zone formed during the second etching step.
2 more elements
Dependencies are inferred from the claim text.