No.1014E 2017Special Edition on Automotive Bearing Technologies Improvement of Bearing Life through Bonding of Non-metallic Inclusions with Matrix

Author T. SADA
Material R&D Dept., Research & Development Headquarters
Heat treatment Production Engineering Dept., Production Engineering Headquarters
Material R&D Dept., Research & Development Headquarters
Abstract Non-metallic inclusions in the material of rolling bearings are well-known to induce subsurface initiated spalling. Among these inclusions, oxides in particular are believed to harm bearing life due to the weak adhesion between the oxide and the matrix. In this study, life tests were carried out for the inner rings of deep groove ball bearings made from low cleanliness bearing steel to which hot isostatic pressing (HIP) had been applied. From the experimental results, we confi rmed that life improvement of radial bearings can be achieved by bonding the oxides with the matrix. Furthermore, void closing analyses were carried out using a model for ideal void shape. From the correlation between the void closing rates obtained by these analyses and the interface bonding rates measured for the inner rings, we found that void closing analysis is effective in predicting the state of the interface between the oxide and the matrix.
Keyword rolling bearing, rolling contact fatigue, non-metallic inclusion, hot isostatic pressing, fi nite element analysis

K. KIZAWA, M. GOTOH : Estimation of Rolling Contact Fatigue Life through Evaluation of Cleanliness in Bearing Steel, Koyo Engineering Journal, No. 163E (2003) 37.

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