In situ x-ray diffraction study of phase transformation of steel in scuffing process

Seiji Kajita, Kazuyuki Yagi, Takashi Izumi, Jun Koyamachi, Mamoru Tohyama, Koji Saito, Joichi Sugimura

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    15 Citations (Scopus)

    Abstract

    We developed a novel in situ observation method associated with synchrotron radiation X-ray diffraction (XRD) that enables us to simultaneously monitor structural changes of materials, images at frictional interfaces, friction force and temperature with a time resolution on the order of tens of milliseconds. The in situ method was applied to study scuffing process of martensitic steel under a dry condition. The result shows that during scuffing, martensite to austenite phase transformation occurred with plastic flow. The generated austenite phase disappeared when the shear test was stopped. The austenite was present at a surface temperature lower than the nominal austenitisation temperature. After intermittent occurrences of the austenitisation with local plastic flow, the scuffing feature showed a larger amount of austenite, higher friction and greater plastic flow. The XRD spectra suggest that some metallurgical properties of the near-surface material of the steel may change at the scuffing-mode transition.

    Original languageEnglish
    Article number6
    Pages (from-to)1-11
    Number of pages11
    JournalTribology Letters
    Volume57
    Issue number2
    DOIs
    Publication statusPublished - Feb 1 2015

    All Science Journal Classification (ASJC) codes

    • Mechanics of Materials
    • Mechanical Engineering
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films

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