Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
ELECTROLYTIC POTENTIAL IN ELECTROLYTIC ISOLATION OF CARBIDES OF BALL-BEARING STEELS
Manabu UenoHirooki Nakashima
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1958 Volume 44 Issue 4 Pages 483-486

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Abstract

In isolation of carbides of bearing steels their matrices do not always completely dissolve electrolytically. There is the so-called "peeling phenomenon" of the matrix in some samples.
In this report, effect of the electrolytic potential and the copper content in steels on this phenomenon is discussed.
(1) In electrolytic isolation of carbides of bearing steels the peeled matrix increases its amount, when the steel is quenched from higher temperature. This phenomenon is due to the reason why retained austenite increases at the higher quenching temperature and electrolytic potential of the matrix becomes nobler.
(2) The less copper content in steels, the baser the electrolytic potential of the steels without current and the less the amount of the peeled matrix. Electrolytic potential of bearing steel specimen is baser in the annealed than in the quenched state.
(3) The amount of the peeled matrix has a distinct relation to the copper content of the steels: its coefficient of correlation is 0.86. It is presumed that even a slight copper content in steels has at least a great influence on electrochemical properties of the steels.

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© The Iron and Steel Institute of Japan
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