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Influence of slip ratio on worn-surface microstructure and fatigue wear behavior of D2 wheel steel

  • Chun-peng Liu
  • Xiu-juan Zhao
  • Peng-tao Liu
  • Chong Xu
  • Rui-ming Ren
Original Paper
  • 3 Downloads

Abstract

To investigate the worn-surface microstructure and fatigue cracks in D2 wheel steel under the pure rolling and 0.5% slip ratio conditions, a rolling wear test using a GPM-40 wear machine to simulate the wheel/rail operation was performed. After testing, a transmission electron microscope, a scanning electron microscope with electron backscatter diffraction, and micro-hardness testers were used to characterize the microstructure and fatigue cracks. The surface microstructure and hardness of the pure rolling sample were in a steady state after 8 × 104 cycles; however, the 0.5% slip ratio sample reached a steady state after 7 × 103 cycles. Regardless of whether the test uses the slip ratio, the orientation of lamellar pearlites gradually became parallel to the surface and a portion of lamellar cementites was fragmented and dissolved during the formation of steady-state microstructure. The slip ratio accelerates this process. The hardening mechanism of the samples shows a decrease in the lamellar spacing of pearlite and the refinement of proeutectoid ferrite (PF). As the number of cycles increased, plastic deformation of samples became increasingly severe and the wear mechanism of the samples was fatigue wear in steady state. The sample surfaces formed shallow cracks, which gradually peeled off. The slip ratio accelerated the initiation and propagation of fatigue cracks because of the high friction stress on the contact surface. Most fatigue cracks initiated at the interface of pearlite and PF and in the PF region.

Keywords

D2 wheel steel Slip ratio Worn-surface microstructure Wheel/rail system Rolling wear 

Notes

Acknowledgements

This research was supported by National Key Basic Research Program of China (No. 2015CB654802).

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Copyright information

© China Iron and Steel Research Institute Group 2018

Authors and Affiliations

  • Chun-peng Liu
    • 1
  • Xiu-juan Zhao
    • 1
    • 2
  • Peng-tao Liu
    • 1
  • Chong Xu
    • 3
  • Rui-ming Ren
    • 1
    • 2
  1. 1.School of Material Science and EngineeringDalian Jiaotong UniversityDalianChina
  2. 2.Key Laboratory of Critical Materials of Rail Transportation in Liaoning ProvinceDalian Jiaotong UniversityDalianChina
  3. 3.School of Mechanical EngineeringDalian Jiaotong UniversityDalianChina

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