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    Volume 5, Issue 1

    Evaluation of Rolling Contact Fatigue Using X-Ray Diffraction Ring

    (Received 26 May 2015; accepted 29 October 2015)

    Published Online: 2016

    CODEN: MPCACD

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    Abstract

    In this report, a novel approach for evaluating the progressive degree of rolling contact fatigue (RCF) is introduced. The rolling contact surface after two-cylinder testing was evaluated by a new X-ray analyzer, which can rapidly obtain tri-axial residual stresses and the orientation of crystallite from an X-ray diffraction ring (Debye ring) on a two-dimensional detector. The non-uniform intensity of the Debye ring was observed for the tested sample under boundary lubrication. This makes it clear that RCF, under asperity contact conditions, accompanies the formation of an oriented texture of martensite grain. In addition, characteristic residual stresses that differ from the plane stress condition were observed for asperity contact surface, and residual von Mises stress, derived from their tri-axial residual stresses, demonstrates severe plastic deformation close to yield stress of hardened bearing steel. The behaviors of martensite grain orientation, tri-axial residual stress, and surface damage were investigated for several samples under different RCF conditions to clarify the mechanism of surface-initiated failure. The Debye ring analyzer can rapidly obtain more information regarding accumulation of fatigue, criteria of fracture, crack development, and shake-down in rolling contact subsurface, as compared with conventional X-ray diffraction analyzers. This new system is a promising method, not only to investigate the mechanism of RCF, but also to allow for the quantitative estimation of the progressing degree of RCF.


    Author Information:

    Fujita, Takumi
    Elemental Technological R&D Center, NTN Corporation, Kuwana-shi, Mie

    Kamura, Naoya
    Advanced Technology R&D Center, NTN Corporation, Kuwana-shi, Mie

    Maruyama, Yoichi
    X-Ray Applications Equipment Section, Engineering Department, Pulstec Industrial Co., Ltd., Kita-ku, Hamamatsu-city, Shizuoka,

    Sasaki, Toshihiko
    School of Humanities, College of Human and Social Science, Kanazawa University, Ishikawa,


    Stock #: MPC20150027

    ISSN:2165-3992

    DOI: 10.1520/MPC20150027

    Author
    Title Evaluation of Rolling Contact Fatigue Using X-Ray Diffraction Ring
    Symposium ,
    Committee F34