Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Peculiar Microstructure Formed by Rolling Contact Fatigue in Bearing Steels
Akira MUROGAHiroyasu SAKA
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1998 Volume 84 Issue 5 Pages 351-356

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Abstract

A peculiar microstructure formed in a case-hardened steel has been examined by transmission electron microscopy. The microstructure is called a bright etched region (BER) because it appears bright when etched with Nital. BER consists mainly of very fine grains, the average size of which is a few tens nanometers. An amorphous region is observed near a crack which is formed in BER. The observation indicates that, during rolling contact fatigue, a coarse grain of martensite is transformed into polycrystals with very fine grains, and then into an amorphous region, from which a crack initiates.

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© The Iron and Steel Institute of Japan
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