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<p>The fatigue properties, microstructure and influencing factors of Q345B steel were studied in this paper. Tensile fatigue tests of the elevated temperatures were conducted in this study. SEM and EBSD were used to characterize microstructure and fracture surfaces. The results demonstrated that the fatigue properties and failure modes of Q345B steel were influenced by the coupled effects of temperature and load. Specifically, a critical temperature for the thermal fatigue effect of Q345B steel was identified. When the temperature surpassed this critical value, the fatigue life of Q345B steel in the high-stress region was enhanced. However, the fatigue life of Q345B steel diminished with increasing temperature at low stress levels. The interval of microfatigue striation as well as the depth and uniformity of dimples were observed in Q345B steel specimens.</p>

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Effect of Temperature and Load Coupling on Fatigue Properties of Q345B Steel

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Hui Pan,
  • Congzhong Wen,
  • Ke Ma,
  • Xinwei Wang

摘要

The fatigue properties, microstructure and influencing factors of Q345B steel were studied in this paper. Tensile fatigue tests of the elevated temperatures were conducted in this study. SEM and EBSD were used to characterize microstructure and fracture surfaces. The results demonstrated that the fatigue properties and failure modes of Q345B steel were influenced by the coupled effects of temperature and load. Specifically, a critical temperature for the thermal fatigue effect of Q345B steel was identified. When the temperature surpassed this critical value, the fatigue life of Q345B steel in the high-stress region was enhanced. However, the fatigue life of Q345B steel diminished with increasing temperature at low stress levels. The interval of microfatigue striation as well as the depth and uniformity of dimples were observed in Q345B steel specimens.