Abstract:White etching area (WEA) is widely known as a microstructural change caused by rolling contact fatigue of a bearing. It has been reported that early flaking accompanied by the WEA occurred in such bearings as those for automotive alternators, and effective measures have been demanded. The WEA type microstructural change has so far been studied in detail, particularly for butterfly, which was metallographically characterized as follows: First, the WEA coexists with microcracks, which was initiated by nonmetalli… Show more
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