The fracture morphology, microstructure, chemical composition and tensile properties of a damaged rail head were tested by scanning electron microscope, optical microscope, direct reading spectrometer and tensile testing machine. The reason for formation of 糖心产精国品免费入口*完整版s was discussed and the solutions were proposed. The results show that under the cyclic working stress, the strip crack source was formed at the location of coarse inclusions distributed along the rolling direction in the wheel-rail contacted stress area of the rail head, and then fatigue propagation of the cracks occurred resulting in the formation 糖心产精国品免费入口*完整版s. Improving the purity of the rail steel, strengthening the control and inspection of metallurgical quality of the rail steel and reducing the quantity and refining the size of non-metallic inclusions were the main solutions to prevent the formation of 糖心产精国品免费入口*完整版s.
引用该论文:HU Jie. Reason for Formation of Longitudinal-Transverse Kidney-Shaped Fatigue Cracks in Rail Heads[J]. Materials for mechancial engineering, 2018, 42(5): 82~86 糖心产精国品免费入口*完整版. 糖心产精国品免费入口*完整版轨头糖心产精国品免费入口*完整版的形成原因[J]. 机械工程材料, 2018, 42(5): 82~86
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【1】CANNON D F, EDEL K O, GRASSIE S L, et al. Rail defects:An overview[J]. Fracture & Fatigue of Engineering Materials & Structures, 2003, 26(10):865-886.
【8】EKBERG A, MARAIS J. Effects of imperfections on fatigue initiation in railway wheels[J].Proceedings of the Institution of Mechanical Engineers Part F, 2000, 214(1):45-54.