Überrollungslebensdauer des Wälzlagerstahls100Cr6 in Abhängigkeit von nicht idealenGefügeausbildungen unter besondererBerücksichtigung der Karbidzeiligkeit

In this study rolling contact fatigue life tests of different variants of 100Cr6 (SAE 52100) bearing steel were performed with roller bearings under hydrodynamic lubrication. All bearings failed from subsurface crack initiation. Additionally determined fatigue lives gained from compression torsion tests with round specimens could be correlated with the results of the rolling contact fatigue tests. Carbide strings resulting from primary carbides are locally concentrated in the core of the semi-finished material where the non-metallic inclusion content is also increased. Generally, carbide strings may have a negative influence on the fatigue life behaviour. If present in regions of highly stressed material in the bearings oxides are the life limiting factor of rolling contact fatigue life.