METALLOGRAPHIC TECHNIQUE FOR THE DEVELOPMENT OF MICROSTRUCTURAL CONSTITUENTS IN GUN STEEL.
WATERVLIET ARSENAL N Y
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An investigation was undertaken to develop etching procedures to clearly distinguish certain metallographic features of large forgings. The investigation demonstrates that 1 good microstructure resolution was obtained in untempered martensite using a 2 nital etchant, 2 either 25 sodium bisulfite in water or 4 picral plus hydrochloric acid yielded the best results for both tempered martensite and a duplex structure of tempered martensite and tempered lower bainite, and 3 an aqueous solution of 1 picric acid and 7 sodium tridecylbenzene sulfonate proved highly satisfactory in revealing both the prior austenitic grain boundaries and the macrostructure. Author
- Properties of Metals and Alloys