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首页> 外文期刊>Materials Science and Engineering >The difference in low cycle fatigue behavior of CP-Ti under fully reversed strain and stress controlled modes along rolling direction
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The difference in low cycle fatigue behavior of CP-Ti under fully reversed strain and stress controlled modes along rolling direction

机译：CP-Ti在完全反向应变和应力控制模式下沿轧制方向的低周疲劳行为的差异

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摘要

In order to understand the effects of cyclic asymmetry and control mode on low cycle fatigue (LCF) behavior of CP-Ti along rolling direction (RD), symmetrical strain and stress-controlled fatigue tests were conducted in this paper. LCF behavior of CP-Ti along RD under different control modes was systematically compared from the aspects of cyclic response, microstructure evolution and fatigue life with the technique of electron backscatter diffraction (EBSD) and scanning electron microscope (SEM). It was found that cyclic softening resulted by dislocation slip dominates strain-controlled fatigue. On the contrary, cyclic hardening dominates stress-controlled fatigue at high stress amplitude, leading to a higher cyclic stress-strain curve. Owing to asymmetrical hysteresis loop, compressive ratcheting strain is accumulated in stress-controlled LCF test despite of the fully reversed stress cycling. EBSD results show there is a transition of deformation mechanism from dislocation slip to dislocation slip and twinning dominated cyclic deformation with the increase of compressive ratcheting strain. Meanwhile, GOS analysis and SEM observation indicate that the appearance of massive twins results in the heterogeneous plastic deformation and micro-cracks are favorable to be initiated in the twin abundant area. Besides, compressive ratcheting strain has significant effects on fatigue crack growth as the fracture surface presents the serious abrasion of cleavage facets and fatigue striations. Finally, strain-life curves under different control modes are identical, indicating that fatigue life along RD is insensitive to compressive ratcheting strain under the interaction of these factors.
机译：为了了解循环不对称性和控制方式对CP-Ti沿轧制方向（RD）的低周疲劳（LCF）行为的影响，本文进行了对称应变和应力控制疲劳试验。利用电子背散射衍射（EBSD）技术和扫描电子显微镜（SEM）从循环响应，微观组织演变和疲劳寿命等方面系统地比较了CP-Ti在不同控制模式下沿RD的LCF行为。发现由位错滑移引起的循环软化在应变控制疲劳中占主导地位。相反，循环硬化在高应力振幅下主导着应力控制的疲劳，导致循环应力-应变曲线更高。由于不对称的磁滞回线，尽管应力循环完全反向，但在应力控制的LCF测试中仍会累积压缩棘轮应变。 EBSD结果表明，随着压缩棘轮应变的增加，变形机制从位错滑移到位错滑移，并以孪晶为主的周期性变形。同时，GOS分析和SEM观察表明，大量孪晶的出现导致塑性变形的不均匀，并且微裂纹有利于在孪晶丰富区域引发。此外，由于断裂表面呈现出严重的开裂面磨损和疲劳条纹，压缩棘轮应变对疲劳裂纹扩展具有显着影响。最后，在不同控制模式下的应变寿命曲线是相同的，这表明沿RD的疲劳寿命在这些因素的相互作用下对压缩棘轮应变不敏感。

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  • 来源
    《Materials Science and Engineering》 |2019年第10期|211-223|共13页
  • 作者

    Chang Le; Zhou Bin-Bin; Ma Tian-Hao; Li Jian; He Xiao-Hua; Zhou Chang-Yu;

  • 作者单位

    Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Jiangsu, Peoples R China|Jiangsu Key Lab Design & Manufacture Extreme Pres, Nanjing 211816, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Jiangsu, Peoples R China|Jiangsu Key Lab Design & Manufacture Extreme Pres, Nanjing 211816, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Jiangsu, Peoples R China|Jiangsu Key Lab Design & Manufacture Extreme Pres, Nanjing 211816, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Jiangsu, Peoples R China|Jiangsu Key Lab Design & Manufacture Extreme Pres, Nanjing 211816, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Jiangsu, Peoples R China|Jiangsu Key Lab Design & Manufacture Extreme Pres, Nanjing 211816, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Sch Mech & Power Engn, Nanjing 211816, Jiangsu, Peoples R China|Jiangsu Key Lab Design & Manufacture Extreme Pres, Nanjing 211816, Jiangsu, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    CP-Ti; LCF; EBSD; Compressive ratcheting;

    机译：CP-Ti;LCF;EBSD;压缩棘轮;

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