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Ni-based superalloys - General macrostructure

Material Name: Ni-based superalloys
Recipe No.: 9614
Primary Chemical Element in Material: Ni
Sample Type: Bulk
Uses: General macrostructure
Etchant Name: None
Type (Macro/Micro): Macro
Etching Method: Chemical
Etchant (Electrolyte) Composition: 80 ml HCl, 2 ml HNO3, 11 ml H2O, 16 g FeCl3.
Procedure (Condition): Preheat sample in hot water (180 F) for a few minutes before etching.
Note: Widely used for pickling and macroetchinh of superalloys. Produce grain contrast.
Reference: Vander Voort, Metallography Principles and Practice, McGraw-Hill, Inc., 1984, p. 526.