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Tribology Letters

, 57:6 | Cite as

In Situ X-Ray Diffraction Study of Phase Transformation of Steel in Scuffing Process

  • Seiji KajitaEmail author
  • Kazuyuki Yagi
  • Takashi Izumi
  • Jun Koyamachi
  • Mamoru Tohyama
  • Koji Saito
  • Joichi Sugimura
Original Paper

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.

Keywords

In situ observation X-ray diffraction Scuffing Steel Phase transformation Austenite 

Notes

Acknowledgments

We acknowledge Dr. Y. Hayashi at Toyota Central R&D Labs., Inc., who performed the XRD data acquisition. The synchrotron radiation experiments were performed at the BL33XU line of SPring-8 with the approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2013B7021).

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Seiji Kajita
    • 1
    Email author
  • Kazuyuki Yagi
    • 2
  • Takashi Izumi
    • 1
  • Jun Koyamachi
    • 3
  • Mamoru Tohyama
    • 1
  • Koji Saito
    • 4
  • Joichi Sugimura
    • 2
  1. 1.Toyota Central R&D Labs., Inc.NagakuteJapan
  2. 2.Department of Mechanical Engineering, Faculty of EngineeringInternational Institute for Carbon-Neutral Energy Research (I²CNER) Kyushu UniversityFukuokaJapan
  3. 3.Department of Hydrogen Energy Systems, Graduate School of EngineeringKyushu UniversityFukuokaJapan
  4. 4.Toyota Motor CorporationToyotaJapan

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