Nondestructive metallographic examination of gas turbine compone

Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge

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20412985, 204146, C25F 302, C25F 500

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active

042343976

ABSTRACT:
A method is disclosed for the nondestructive examination of coated gas turbine components after service. An electrolytic polishing technique is used to uniformly remove the coating from a portion of the component. An electrolytic etching process is then used to preferentially remove a portion of the underlying substrate so as to leave the microstructure in relief. A metallographic examination may then be made to determine if the part is suitable for reuse. Apparatus for conducting the previously described method is also prevented.

REFERENCES:
patent: 2706171 (1955-04-01), Goral et al.
patent: 2840521 (1958-06-01), Wasserman
patent: 3434956 (1969-03-01), Glenn
patent: 3779879 (1973-12-01), Scott
patent: 3788958 (1974-01-01), Dillenberg

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