Cleanliness of Bearing Steels and Fatigue Life of Rolling Contacts

    Volume 3, Issue 6 (June 2006)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 17 May 2006

    Page Count: 6


    Kerrigan, A
    Focus Area Expert, Engineer, and Senior Engineer, SKF Engineering Research Centre, Nieuwegein,

    Kuijpers, JC
    Focus Area Expert, Engineer, and Senior Engineer, SKF Engineering Research Centre, Nieuwegein,

    Gabelli, A
    Focus Area Expert, Engineer, and Senior Engineer, SKF Engineering Research Centre, Nieuwegein,

    Ioannides, E
    Technical Director Product R&D, SKF Group Quality & Technology Development, Nieuwegein,

    (Received 25 May 2005; accepted 10 March 2006)

    Abstract

    Established metallographic methods of determining the cleanliness of bearing steels with respect to micro-inclusions, such as ASTM E 45, are capable of differentiating poor quality melts from good quality melts. However, as steelmaker capabilities improve, with increasing numbers being able to consistently produce good quality melts, the established methods of cleanliness assessment are unable to differentiate between melts. These established methods, which give single figure ratings based on both the size and number of inclusions, are extremely difficult to use in predicting the performance of a bearing component under conditions of rolling contact fatigue. In this work, the method of Extreme Value Analysis (EVA) is used to characterize the inclusion population of five different steel melts of known and varying quality. A link between the EVA distribution and the measured bearing life, performed on material with a low reduction ratio, is also presented.


    Paper ID: JAI14040

    DOI: 10.1520/JAI14040

    ASTM International is a member of CrossRef.

    Author
    Title Cleanliness of Bearing Steels and Fatigue Life of Rolling Contacts
    Symposium Bearing Steel Technologies: 7th International Symposium, 2005-05-19
    Committee A01