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    Rolling Contact Fatigue Damage of High-Speed Railway Wheels With Upper Bainite

    Source: Journal of Tribology:;2021:;volume( 144 ):;issue: 005::page 51502-1
    Author:
    Zhang, Guan-Zhen
    ,
    Liu, Chun-Peng
    ,
    Wu, Si
    ,
    Zhao, Sa
    ,
    Zhang, Bin
    DOI: 10.1115/1.4052868
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: This work investigates the effect of abnormal microstructure on rolling contact fatigue (RCF) damage of high-speed railway wheels under service and the formation mechanism of abnormal microstructure by optical microscopy, scanning electron microscopy, transmission electron microscopy, nano indentation and laser-induced break down spectroscopy. Results show that there are large amounts of upper bainite in the wheel tread, which destroyed the uniformity of the microstructures of the wheel matrix. The bainite is composed of ferrite with high density of dislocations and short bar-shaped cementite. The bainite exhibited higher hardness and elasticity but lower plasticity than the matrix microstructure. The incongruity of plastic deformation between upper bainite and matrix microstructures will lead to stress concentration at boundary of the microstructures, thus accelerating the RCF crack initiation and propagation. The formation of upper bainite is caused by carbon segregation. Segregation of carbon element will make the continuous cooling transformation (CCT) curve shift to the right significantly, thus increasing the probability of bainite transformation in segregation zone at higher cooling rate. Therefore, large amounts of upper bainite were formed at wheel tread.
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      Rolling Contact Fatigue Damage of High-Speed Railway Wheels With Upper Bainite

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4284297
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    contributor authorZhang, Guan-Zhen
    contributor authorLiu, Chun-Peng
    contributor authorWu, Si
    contributor authorZhao, Sa
    contributor authorZhang, Bin
    date accessioned2022-05-08T08:45:11Z
    date available2022-05-08T08:45:11Z
    date copyright12/2/2021 12:00:00 AM
    date issued2021
    identifier issn0742-4787
    identifier othertrib_144_5_051502.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4284297
    description abstractThis work investigates the effect of abnormal microstructure on rolling contact fatigue (RCF) damage of high-speed railway wheels under service and the formation mechanism of abnormal microstructure by optical microscopy, scanning electron microscopy, transmission electron microscopy, nano indentation and laser-induced break down spectroscopy. Results show that there are large amounts of upper bainite in the wheel tread, which destroyed the uniformity of the microstructures of the wheel matrix. The bainite is composed of ferrite with high density of dislocations and short bar-shaped cementite. The bainite exhibited higher hardness and elasticity but lower plasticity than the matrix microstructure. The incongruity of plastic deformation between upper bainite and matrix microstructures will lead to stress concentration at boundary of the microstructures, thus accelerating the RCF crack initiation and propagation. The formation of upper bainite is caused by carbon segregation. Segregation of carbon element will make the continuous cooling transformation (CCT) curve shift to the right significantly, thus increasing the probability of bainite transformation in segregation zone at higher cooling rate. Therefore, large amounts of upper bainite were formed at wheel tread.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleRolling Contact Fatigue Damage of High-Speed Railway Wheels With Upper Bainite
    typeJournal Paper
    journal volume144
    journal issue5
    journal titleJournal of Tribology
    identifier doi10.1115/1.4052868
    journal fristpage51502-1
    journal lastpage51502-11
    page11
    treeJournal of Tribology:;2021:;volume( 144 ):;issue: 005
    contenttypeFulltext
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