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Austenitic Mn steels - Chemical etching

Material Name: Austenitic Mn steels
Recipe No.: 10508
Primary Chemical Element in Material: Fe
Sample Type: Bulk
Uses: General microstructure
Etchant Name: None
Type (Macro/Micro): Micro
Etching Method: Chemical
Etchant (Electrolyte) Composition: Solution a: 98 ml ethanol, 2 ml HNO3. Solution b: 20 g sodium metabisulfite, 100 ml distilled water.
Procedure (Condition): Etch in solution a for 5 s, rinse, dry. Etch in solution b until surface is darkened.
Note: For austenitic Mn steels. Produces excellent grain contrast, reveals depth of surface decarburization.
Reference: Vander Voort, Metallography Principles and Practice, McGraw-Hill, Inc., 1984, p. 634.