Analysis of the Tribological Behaviour of Stainless and Ball Bearing Steels Sliding in the Presence of Sulphur Extreme-Pressure Additives

  • Sattar J. Dawud

    Student thesis: Master's ThesisMaster of Philosophy


    Conventional wear tests using a Four-Ball Lubricant Tester
    with the British Standard SAE 52100 steel were supplemented by tests
    with a stainless steel (AISI 420). Four combinations of these two
    materials were studied, namely each material was used in turn for the
    upper (driven) ball and the lower (clamped) balls. The tribological
    behaviour of stainless and ball bearing steel were studied under
    extreme pressure and/or anti-wear lubrication conditions in the
    presence of sulphur and sulphur containing additives, in order to compare
    the wear behaviour of the AISI 420 stainless steel with the SAE 52100
    steel, taking into account the influence of chromium in both materials.
    Electron Probe Microanalysis and Glancing Angle X-ray Diffraction
    combined with Scanning Electron Microscopy have been used to identify
    the thin films produced on the worn surfaces and to study the micro-
    Structures of the subsurface layers. This investigation shows that the
    wear behaviour of a combination of materials is worsened by the greater
    use of the stainless steel in the rotating and stationary balls. The
    percentage of chromium does have a deleterious effect on the wear
    behaviour of the AISI 420 stainless steel, where the anti wear and
    extreme pressure actions were suppressed. These effects were 3
    investigated using surface analytical techniques by using the same and
    mixed specimens.
    Date of Award1985
    Original languageEnglish


    • tribological behaviour
    • steels
    • anti-wear
    • additives
    • extreme-pressure
    • physical analysis

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