Volume 37 Issue 1
Jun.  2022
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CHEN Pei, LI Chong, YUAN Xiaodong, GAO Lingqing, ZHANG Xinyao, CHA Xiaoqin, ZHANG Xinyu, GAO Yuhao. Research on Behavior of Tensile-torsional Fatigue of Ti6321 Alloy[J]. Development and Application of Materials, 2022, 37(1): 1-7.
Citation: CHEN Pei, LI Chong, YUAN Xiaodong, GAO Lingqing, ZHANG Xinyao, CHA Xiaoqin, ZHANG Xinyu, GAO Yuhao. Research on Behavior of Tensile-torsional Fatigue of Ti6321 Alloy[J]. Development and Application of Materials, 2022, 37(1): 1-7.
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Research on Behavior of Tensile-torsional Fatigue of Ti6321 Alloy

  • 1. Luoyang Ship Material Research Institute, Luoyang 471023, China;

  • 2. Henan Key Laboratory of Technology and Application of Structural Materials for Ships and Marine Equipments, Luoyang 471023, China;

  • 3. National and Local Joint Engineering Research Center of Advanced Titanium and Titanium Alloy Materials Technology, Luoyang 471023, China

  • Received Date: 2021-07-26
    Available Online: 2022-06-11
    Abstract
  • The fatigue life of Ti6321 alloy with phase differences of 0°and 30°is analyzed by tensile-torsional fatigue test. The propagation path of micro-cracks and macro-cracks at 0°phase difference is studied, and the fatigue fracture surface analyzed.Resultsshow that axial-torsional fatigue life of Ti6321 alloy at 30° phase difference is shorter than that at 0° phase difference. The Ti6321 surface micro-cracks, mainly affected by shear stress, is initiated in the range of 20°~30° to axial direction. Besides, with the increase of equivalent stress amplitude, the number of initiated surface micro-cracks increases. And the main crack tip makes a sharp turn in the direction of small angle to axial direction due to the main crack and merges with micro-cracks during propagation, which restrains the main crack propagation along the maximum normal stress direction. The main axial-torsional fatigue crack, influenced by the micro-cracks, presents step morphology in the propagation zone.

     

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