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Open AccessArticle

Influence of Contact Stress on Surface Microstructure and Wear Property of D2/U71Mn Wheel-Rail Material

1
School of Material Science and Engineering, Dalian Jiaotong University, Dalian 116028, China
2
Key Laboratory of Critical Materials of Rail Transportation in Liaoning Province, Dalian Jiaotong University, Dalian 116028, China
3
National and Local Joint Engineering Center of Rail Transit Equipment Design and Manufacturing Technology, Dalian Jiaotong University, Dalian 116028, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(19), 3268; https://doi.org/10.3390/ma12193268
Received: 12 August 2019 / Revised: 18 September 2019 / Accepted: 20 September 2019 / Published: 8 October 2019
To investigate the relationship between surface microstructure and wear mechanism in D2/U71Mn wheel-rail material under different contact stress conditions, rolling wear tests using a GPM-40 wear machine to simulate the wheel-rail operation was performed. After wear tests, an optical microscope (OM), scanning electron microscope (SEM) and micro-hardness testers were used to characterize the microstructure and fatigue wear cracks. The results show that the thickness of the plastic deformation layer and surface hardness is increased with the increase of contact stress. Under high contact stress condition (1200 MPa), the severe plastic deformation layer led to the formation of fatigue wear of wheel-rail samples. Under a contact stress of 700 MPa, the wear mechanism of samples is adhesive wear and wear rate is low. With the increase of contact stress, the fatigue cracks are gradually severe. Under a contact stress of 1200 MPa, the wear mechanism of samples becomes fatigue wear and the fatigue wear cracks cause the increase of wear rate. The fatigue wear can accelerate the wear failure of wheel-rail samples. The fatigue wear cracks of wheel samples are severer than that of rail samples due to both the rate of plastic strain and the content of proeutectoid ferrite. View Full-Text
Keywords: D2 wheel steel; U71Mn rail steel; contact stress; surface microstructure; fatigue wear D2 wheel steel; U71Mn rail steel; contact stress; surface microstructure; fatigue wear
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MDPI and ACS Style

Liu, C.-P.; Zhao, X.-J.; Liu, P.-T.; Pan, J.-Z.; Ren, R.-M. Influence of Contact Stress on Surface Microstructure and Wear Property of D2/U71Mn Wheel-Rail Material. Materials 2019, 12, 3268.

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