Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Formation Process of White Etching Area under Rolling Contact in Bearing Steel
Hisashi HARADANoriyasu OGUMAAtsushi YAMAMOTOHarushige TSUBAKINO
Author information
JOURNALS FREE ACCESS

2003 Volume 89 Issue 7 Pages 789-795

Details
Abstract

The formation process of White Etching Area (WEA) under rolling contact was investigated to characterize the WEA formation mechanism using radial type rolling fatigue test machine. The examination was carried out under rapid acceleration and deceleration of rotating speed. From observation of test pieces by Scanning Ion Microscope (SIM) and Transmission Electron Microscope (TEM), it was found that acicular structures were formed before forming WEA. The length and width of acicular structures were about 20 μm and about 2 μm respectively. Acicular structures were formed separately from each other and fine granular structures formed from martensite. It was considered that acicular structures were formed by locally microstructural change of martensite due to rolling contact fatigue. The distance from surface to acicular structures were concerned with the location of maximum value of shear stress under rolling contact. An angle between rolling contact surface and acicular structures wasn't consistent with the analytical shear stress angle. It suggested that the stress to govern the forming the acicular structure was not only shear stress under rolling contact but also secondary dynamic stress.

Information related to the author
© The Iron and Steel Institute of Japan
Previous article Next article
feedback
Top