Hardness ratio optimization of HiSi wheel/U71MnG rail tribo-pairs by sliding wear for high-speed train

Hardness matching of wheel and rail steels is important for the economic and safe operation of high-speed trains. A new wheel steel named HiSi has been developed by our group recently. Thus the aim of this paper is to explore the optimal hardness ratio of Hw/Hr for HiSi/U71MnG tribo-pairs. Therefore...

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Bibliographic Details
Published in:Materials research express 2020-01, Vol.6 (12), p.1265
Main Authors: Diao, Guijiang, Shi, Xiaojiao, Zhang, Xiaoxin, Wen, Zefeng, Jin, Xuesong, Yan, Qingzhi
Format: Article
Language:English
Subjects:
Hardness ratio
HiSi wheel
Sliding wear
U71MnG rail
Wear mechanism
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Summary:Hardness matching of wheel and rail steels is important for the economic and safe operation of high-speed trains. A new wheel steel named HiSi has been developed by our group recently. Thus the aim of this paper is to explore the optimal hardness ratio of Hw/Hr for HiSi/U71MnG tribo-pairs. Therefore, HiSi wheel steels with various hardness were prepared by tempering at 500 °C-660 °C. Then microstructure and mechanical properties including hardness, strength, elongation and absorbed energy was evaluated with the comparison of ER8 and U71MnG. With the increase of tempering temperature, cementite morphology was transformed from lamellar cementite to plate cementite then to spheroidized cementite, which improved the ductility and toughness of HiSi steel. Furthermore, the sliding wear test under the hardness ratio of 0.91-1.11 revealed that the optimal Hw/Hr in HiSi/U71MnG tribo-pairs was about 0.98-1.04, which can be attributed to the ploughing damage without material remove, more adhesive films and suitable mechanical properties of HiSi steel tempered at 560°C-620°C.
ISSN:2053-1591
2053-1591
DOI:10.1088/2053-1591/ab5f87