STP1327: From White Etching Areas Formed Around Inclusions to Crack Nucleation in Bearing Steels Under Rolling Contact Fatigue

    Vincent, A
    Professor, Assistant Professor, Doctoral Student and Professor, Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux (U.M.R. C.N.R.S. 5510) / I.N.S.A., Villeurbanne,

    Lormand, G
    Professor, Assistant Professor, Doctoral Student and Professor, Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux (U.M.R. C.N.R.S. 5510) / I.N.S.A., Villeurbanne,

    Lamagnère, P
    Professor, Assistant Professor, Doctoral Student and Professor, Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux (U.M.R. C.N.R.S. 5510) / I.N.S.A., Villeurbanne,

    Gosset, L
    Research Engineer, Senior Engineer and Manager, SNR Roulements, Annecy,

    Girodin, D
    Research Engineer, Senior Engineer and Manager, SNR Roulements, Annecy,

    Dudragne, G
    Research Engineer, Senior Engineer and Manager, SNR Roulements, Annecy,

    Fougères, R
    Professor, Assistant Professor, Doctoral Student and Professor, Groupe d'Etudes de Métallurgie Physique et de Physique des Matériaux (U.M.R. C.N.R.S. 5510) / I.N.S.A., Villeurbanne,

    Pages: 15    Published: Jan 1998


    Abstract

    A method of calculating fatigue life of bearing steels, which accounts for the material fatigue process in relation with its microstructure, is required for optimizing these materials. Such a new approach is presented for bearing steels submitted to rolling contact fatigue, for which inclusions are well known to play a fundamental role on steel fatigue strength. A characterization of the steel is carried out by means of nano-indentation tests for determining the elastoplastic properties of the inclusions, and compression tests for determining the microyield stress and cyclic plasticity behavior of the steel matrix. Furthermore the number of cycles to crack nucleation is determined by high frequency ultrasonic echography. A model is developed to estimate movement and accumulation of dislocations around high modulus inclusions. This model enables us to calculate shape and size of white etching areas formed around inclusions as well as the number of cycles to crack nucleation.

    Keywords:

    bearing steel, rolling contact fatigue, inclusion, white etching area, crack nucleation


    Paper ID: STP12123S

    Committee/Subcommittee: A01.28

    DOI: 10.1520/STP12123S


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