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首页> 外文期刊>Materials Science and Engineering >Crack initiation mechanism and fatigue life of titanium alloy Ti-6Al-2Sn-2Zr-3Mo-X: Effects of stress ratio and loading frequency
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Crack initiation mechanism and fatigue life of titanium alloy Ti-6Al-2Sn-2Zr-3Mo-X: Effects of stress ratio and loading frequency

机译：钛合金Ti-6AL-2SN-2ZR-3MO-X的裂纹起始机理和疲劳寿命：应力比和装载频率的影响

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摘要

In this paper, the fatigue behavior of Ti-6Al-2Sn-2Zr-3Mo-X alloy with basketweave microstructure is investigated at stress ratios R = -1, -0.5,0.1 and 0.3 and loading frequencies f= 0.4 Hz, 4 Hz and 35 Hz. It is shown that the Ti-6Al-2Sn-2Zr-3Mo-X alloy presents two different crack initiation mechanisms. One is due to the cleavage of α grains and the other is due to the microstructure inhomogeneity and deformation incompatibility. For the former case, the fracture surface exhibits facet feature in the crack initiation region. For the latter case, the crack nucleates and initiates at α grains or interfaces and the fracture surface presents no facet feature in the crack initiation region. The higher stress ratio and the lower frequency tend to induce the higher probability for the occurrence of multiple crack initiation mode. Moreover, the paper indicates that the effect of stress ratio on fatigue life could be expressed as N_f= A [(1-R)/2]~lσ~m_(a,R), where A, l and m are material parameters. The scatter of fatigue life is related to both the stress amplitude and the loading frequency. For relative higher stress amplitude, the fatigue life and the frequency at R = -1 could be correlated by a linear relation in log-log scale.
机译：在本文中，在应力比R = -1，-0.5,0.1和0.3和装载频率f = 0.4Hz，4Hz和4 Hz，4 Hz和0.4 Hz，4 Hz和4 Hz和35 Hz。结果表明，Ti-6Al-2SN-2ZR-3MO-X合金呈两种不同的裂纹启动机制。一种是由于α颗粒的切割，另一个是由于微观结构的不均匀性和变形不相容性。对于前壳体，裂缝表面在裂纹起始区域中表现出小关节特征。对于后一种情况，裂缝成核并在α颗粒或界面引发，并且裂缝表面在裂纹引发区域中没有面部特征。较高的应力比和较低频率倾向于诱导较高的多裂纹启动模式的发生概率。此外，纸张表明应力比对疲劳寿命的影响可以表示为n_f = a [（1-r）/ 2]〜lσ〜m_（a，r），其中a，l和m是材料参数。疲劳寿命的散射与应力幅度和负载频率都有关。对于相对较高的应力幅度，疲劳寿命和r = -1处的频率可以通过日志日志比例中的线性关系来相关。

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  • 来源
    《Materials Science and Engineering》 |2020年第4期|140265.1-140265.13|共13页
  • 作者

    Chengqi Sun; Yanqing Li; Ruxu Huang; Lei Wang; Jialong Liu; Lingling Zhou; Guihua Duan;

  • 作者单位

    State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China School of Engineering Science University of Chinese Academy of Sciences Beijing 100049 China;

    State Key Laboratory of Deep-sea Manned Vehicles (China Ship Scientific Research Center) Wuxi 214082 China;

    State Key Laboratory of Deep-sea Manned Vehicles (China Ship Scientific Research Center) Wuxi 214082 China;

    State Key Laboratory of Deep-sea Manned Vehicles (China Ship Scientific Research Center) Wuxi 214082 China;

    Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China;

    State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China;

    State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Ti-6Al-2Sn-2Zr-3Mo-X; Stress ratio; Frequency; Crack initiation mechanism; Fatigue life;

    机译：TI-6AL-2SN-2ZR-3MO-X;压力比;频率;裂纹启动机制;疲劳寿命;

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