In-situ Observation of Grain Structures During Scuffing of Steel by Synchrotron X-ray Diffraction
K. Yagi (1), T. Izumi (2), T. Adachi (1), S. Yamaguchi (2), K. Saito (3), J. Sugimura (1) | TLT 2016 TFC Abstract Highlights October 2018
1. Kyushu University
2. Toyota Central R&D Labs, Inc.
3. Toyota Motor Corp.
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Co-sponsored by ASME Tribology Division.
In-situ observations of grain structures of friction surfaces were conducted during scuffing. The in-situ observation system comprises the synchrotron XRD, a visible camera and a near-infrared camera. A contact area was created between a rotating sapphire ring and a fixed martensitic steel pin. The figure shows in-situ visible images, near-infrared images and X-Ray Diffraction (XRD) spectra of a steel surface during scuffing. The use of synchrotron X-ray beam at SPring-8, Japan enables us to apply the XRD to in-situ analysis for friction surface. The in-situ observation system succeeds in capturing with 30 fps of XRD spectra, visible images, near-infrared images. Captured XRD spectra tell us a transition of the steel surface conditions during scuffing, such as phase, surface temperature, grain diameter and dislocation density.
