Rolling contact fatigue behaviour of heat resistant bearing steels at high operational temperatures

Böhmer, H.-Jürgen; Hirsch, Thomas; Streit, Edgar

doi:10.1002/(sici)1521-4052(199909)30:9<533::aid-mawe533>3.3.co;2-o

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2015

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“…However, heat treatments can be designed so that the proeutectoid cementite need not be present in the final microstructure. 55 Indeed, carbide-free structures are now being investigated for low alloy bearing steels; 51,55 more expensive steels containing a large solute content, such as the Cronidur 30, 56,57 are already available for specialist aerospace applications, with a low carbon concentration that avoids carbides that are undissolved at the austenitisation temperature.…”

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confidence: 99%

Critical Assessment 13: Elimination of white etching matter in bearing steels

Bhadeshia

Solano-Alvarez

2015

Materials Science and Technology

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One form of damage due to rolling contact fatigue is the formation of localised regions of extremely hard material forming within the body of a bearing. These regions have a relatively homogeneous structure and hence etch mildly with respect to the surrounding unaffected matrix. They, therefore, appear white in a darker background when examined using optical microscopy. We assess here the cause of this damage and propose solutions that are backed by evidence that already is available. The issue is important because of the spate of unexpected failures in large wind turbine bearings and of generic importance in determining the life of more well behaved bearing applications.

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