Super Long Life Fatigue Properties of Rail Steel U71Mn and U75V

Abstract:

Railway track steel, U71Mn and U75V were fatigued in this study, with the help of ultrasonic fatigue test system, to investigate the high cycle fatigue life behaviors. The results showed that the fatigue damage still occurs when the fatigue life exceeds 107, and the evolution of S-N curve showed a ladder type. This test showed that the traditional view of fatigue design and life prediction method were unable to meet the requirements of machinery and equipment working in gigacycle fatigue range, very high cycle fatigue behavior of fatigue has become a major challenge for researchers. The scanning electron microscope analysis of crack initiation was performed to clarify the mechanism of very high cycle fatigue failure.

• Periodical: Advanced Materials Research (Volumes 690-693)
• Pages: 1753-1756
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.690-693.1753
• Online since: May 2013
• Authors: Ze Fu Luo, Shi Ming Cui, Yan Zeng Wu, Qingyuan Wang
• Keywords: Fractography Analysis, S-N Curves, Ultrasonic Fatigue, Welded Joint

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