日本金属学会誌

J. Japan Inst. Metals, Vol. 29, No. 3 (1965),
pp. 252-257

The Potentiostatic Etching Figures af Cold-Rolled Austenitic Stainless Steels

Tatsuo Maekawa1, Sadayoshi Nagata1, Nobuo Nakajima1 and Masaru Kagawa1

1Engineering and Research Laboratory, Mitsubishi Atomic Power Industries Incorporated, Saitama

Abstract:

The potentiostatic etching technique for austenitic stainless steels was studied to observe the variation of the structure by cold-rolling. The etching potentials of each phase (ferrite, austenite and grain boundary) were determined from the etching figures of an annealed AISI 321L stainless steel. 1 N H2SO4 (containing 0.01 g/L NH4SCN) and conc HNO3 solutions were selected as etching solutions. The ferrite phase caused by cold-working was etched at a potential of -0.35 V (vs S.C.E.) in H2SO4, and the distribution of ferrite phase was observed by an electron microscope. The slipping band was etched at -0.2 V, the etching potential of austenite phase. The grain boundary was etched at 1.2 V in conc HNO3, and the deformation of the grain by rolling was observed.


(Received 1964/8/7)

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