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<p>The aim of this study is to investigate the low-cycle fatigue performance of weathering bridge steels after corrosion. This study investigates the low-cycle fatigue performance of smooth and rusted Q500qENH bridge steel under symmetric strain control conditions. The microstructure, fracture morphology, and crack propagation characteristics of high-strength steel under low-cycle fatigue loading were analyzed by means of electron backscatter diffraction (EBSD) and scanning electron microscopy (SEM). The results show that the corrosion pits in the rusted specimens lead to the generation of more crack sources. The stress concentration caused by the corrosion pits intensifies dislocation motion, thereby refining the grains around the cracks. In addition, the rusted specimens have a greater impact on plasticity, leading to a decline in their low-cycle fatigue performance.</p>

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Low-Cycle Fatigue Behavior of High-Strength Weathering Bridge Steel Q550qENH after Corrosion

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Xincheng Chen,
  • Hongyan Wu,
  • Wanqi Wang,
  • Xiuhua Gao,
  • Cairu Gao,
  • Linxiu Du,
  • Wang Li,
  • Cuncai Peng,
  • Qiuju Bu,
  • Yuxuan Qiao

摘要

The aim of this study is to investigate the low-cycle fatigue performance of weathering bridge steels after corrosion. This study investigates the low-cycle fatigue performance of smooth and rusted Q500qENH bridge steel under symmetric strain control conditions. The microstructure, fracture morphology, and crack propagation characteristics of high-strength steel under low-cycle fatigue loading were analyzed by means of electron backscatter diffraction (EBSD) and scanning electron microscopy (SEM). The results show that the corrosion pits in the rusted specimens lead to the generation of more crack sources. The stress concentration caused by the corrosion pits intensifies dislocation motion, thereby refining the grains around the cracks. In addition, the rusted specimens have a greater impact on plasticity, leading to a decline in their low-cycle fatigue performance.