Fumio Kurosawa1, Isamu Taguchi1 and Ryutaro Matsumoto1
1Fundamental Research Laboratories, Nippon Steel Corporation, Kawasaki
Crystallographic morphology of the diamond-shaped β phase in stainless steel (25%Ni-19%Cr-5%Al) has been studied using the non-aqcuous electrolyte-potentiostatic etching method (the SPEED method).
The results are summarized as follows;
(1) The diamond-shaped β phase crystals which existed in the same δ -ferrite phase were found to be identical in morphology. The β phase crystal grows to eight < 111 > directions. The three typical shapes of the β phase crystal were newly observed from low indexes by SEM.
(2) The three shapes of the β phase were observed by the rotation of the β phase crystal.
(3) The β phase crystals are grown by agglomeration.
(4) The composition of the β phase was found to be (Ni, Fe, Cr)Al by EDX analysis of the residues collected on a silver membrane filter after the non-aqueous electrolyte-potentiostatic isolation.
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