Ti6321合金的拉-扭疲劳行为研究

陈沛; 李冲; 袁晓东; 高灵清; 张欣耀; 查小琴; 张鑫钰; 高宇昊

Ti6321合金的拉-扭疲劳行为研究

陈沛¹,
李冲^1,2,
袁晓东¹,
高灵清^1,3,
张欣耀^1,3,
查小琴^1,3,
张鑫钰¹,
高宇昊¹

1. 中国船舶重工集团公司第七二五研究所, 河南洛阳 471023;
2. 河南省船舶及海工装备结构材料技术与应用重点实验室, 河南洛阳 471023;
3. 先进钛及钛合金材料技术国家地方联合工程研究中心, 河南洛阳 471023

详细信息

作者简介:
陈沛,男,1987年生,主要从事金属材料的疲劳、断裂性能的测试、评价及研究工作,主要研究方向为材料疲劳性能测试评价、构件的安全评定及寿命预测

中图分类号: TG146.2
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出版历程
- 收稿日期: 2021-07-26
- 网络出版日期: 2022-06-11

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

摘要

摘要: 通过Ti6321合金的拉-扭疲劳试验,对0°和30°相位差的疲劳寿命进行对比分析,研究0°相位差时微裂纹和宏观裂纹扩展路径,并对疲劳断口进行分析。结果表明:相同Mises等效应力幅下,相位差为30°时疲劳寿命相对相位差为0°时的较低;受切应力主要作用,Ti6321合金表面萌生的微裂纹绝大部分分布在与试样轴向夹角20°~30°范围内,且随着等效应力幅增大,拉扭疲劳试样外表面萌生的微裂纹数量也随之增多,主裂纹在扩展过程中与这些微裂纹合并,使得其尖端发生与试样轴向呈小夹角方向急转弯,抑制了其向沿大夹角方向的最大正应力所在平面方向扩展的趋势,从而影响了宏观裂纹的扩展面角度;拉扭疲劳主裂纹在扩展过程中留下了明显的台阶状形貌,这是由于主裂纹在扩展过程中通过此区域时,各界面微裂纹扩展情况不同而造成的。
- Ti6321合金 /
- 拉-扭疲劳 /
- 相位差 /
- 微裂纹 /
- 裂纹扩展面
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.
- Ti6321 alloy /
- tensile-torsional fatigue /
- phase difference /
- micro-crack /
- crack propagation plane

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