Study on fatigue failure mechanism at various temperatures of a high-speed railway wheel steel

Xiu-Yang Fang; Yong-Xiang Zhao; Huan-Wei Liu

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Study on fatigue failure mechanism at various temperatures of a high-speed railway wheel steel

机译：高速铁路车轮钢在不同温度下的疲劳失效机理研究

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摘要

The fatigue life and limit of the wheel rim and the wheel web position of a high-speed railway wheel steel at various testing temperatures (-60 to 60 ℃) were investigated. Both microstructures and fracture morphologies were observed in details. The fatigue failure mechanism at various temperatures was discussed. The results demonstrated that the wheel rim had a longer fatigue lifetime and a higher value of fatigue limit than the corresponding properties of the wheel web due to various microstructural distributions. The temperature, microstructure and stress amplitude had a significant impact on the fatigue initiation and propagation. The typical features including the propagation zone of regular fan-like shapes, the fatigue step, the gray wear facets and the fatigue striation were observed on the fracture surface, which were related to the failure mechanism transition.

机译：研究了在各种测试温度（-60至60℃）下高速铁路车轮钢的疲劳寿命，轮辋极限和轮辐位置。详细观察了微观结构和断裂形态。讨论了各种温度下的疲劳破坏机理。结果表明，由于各种微观结构分布，轮辋比轮辐的相应性能具有更长的疲劳寿命和更高的疲劳极限值。温度，微观结构和应力振幅对疲劳的萌生和扩展具有重要影响。在断裂面上观察到典型特征，包括规则的扇形形状的传播区，疲劳台阶，灰色磨损面和疲劳条纹，这与失效机理的转变有关。

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来源
《Materials Science and Engineering》 |2017年第1期|299-314|共16页
作者
Xiu-Yang Fang; Yong-Xiang Zhao; Huan-Wei Liu;
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作者单位

School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China;

School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China;

State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China;

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正文语种 eng
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关键词
Railway wheel steel; Fatigue; Failure mechanism; Microstructure; Temperature;

机译：铁路车轮钢;疲劳;失效机制;微观结构温度;

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Study on fatigue failure mechanism at various temperatures of a high-speed railway wheel steel

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