Microstructural investigation on a rail fracture failure associated with squat defects

被引:6
|
作者
Al-Juboori, Ali [1 ,3 ]
Zhu, Hongtao [1 ]
Li, Huijun [1 ]
McLeod, John [2 ]
Pannila, Shamal [2 ]
Barnes, Jonathan [2 ]
机构
[1] Univ Wollongong, Fac Engn & Informat Sci, Wollongong, NSW, Australia
[2] Sydney Trains, Engn & Syst Integr Engn Maintenance Div, Sydney, NSW, Australia
[3] Middle Tech Univ, Tech Engn Coll Baghdad, Baghdad, Iraq
关键词
Squat defects; Rail fracture failure; Microscopic investigation; Rolling contact fatigue; ROLLING-CONTACT FATIGUE; WHITE ETCHING LAYER; SURFACE; GROWTH; CRACK; STEEL; WATER;
D O I
10.1016/j.engfailanal.2023.107411
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Squats, observed in numerous railway networks worldwide, are a significant concern for rail track maintenance. This work presents a specific case study of a rail fracture failure associated with squat defects. A detailed microstructural analysis was conducted to investigate the causes of squat formation, subsequent crack propagation, transverse defects, and fracture. According to the findings, the initiation of squats can be attributed to the presence of White Etching Layers on the rail surface and rolling contact fatigue. After the initiation of Squats, the cracks extended downwards into the bulk rail at a shallow angle until reaching a sizeable martensitic island located in the subsurface of the rail along the path of crack propagation. The brittleness of the undesired martensitic structure triggered rapid crack development, facilitated transverse cracking, and ultimately resulted in rail fracture failure. Transmission electron microscopy examination confirmed that the abnormal defects are plate martensite with a twin substructure and high carbon content, which could be generated as a result of improper heat treatment during the manufacturing of rails.
引用
收藏
页数:12
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