Investigation of the influence of macrozones in titanium alloys on the propagation and scattering of ultrasound
Investigation of the influence of macrozones in titanium alloys on the propagation and scattering of ultrasound
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DOI：
10.1098/rspa.2023.0176
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发表时间：
2023-04
期刊：
影响因子：
--
通讯作者：
W. Yeoh;Bo Lan;M. J. Lowe
中科院分区：
文献类型：
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作者：
W. Yeoh;Bo Lan;M. J. Lowe
Ti-6Al-4V（Ti-64）中存在的宏观区（或微观纹理区域）被证明是冷驻留疲劳开始的潜在原因，冷驻留疲劳显著降低疲劳寿命。过去的研究已经证明了使用超声波检测宏区表征的潜力，在宏区的存在下，超声衰减，后向散射和速度的变化。然而，由于微观结构的复杂性，观察到的一些物理现象仍然没有得到很好的理解。在这项研究中，我们提出了使用有限元多晶模型，为我们提供了一种手段，系统地研究波宏区相互作用。通过使用二维模型进行的这项调查，我们能够识别宏观区域特征（大小，形状和纹理）和超声响应（衰减，反向散射和速度）之间的重要相关性。观察到的行为，然后通过实验验证，我们还强调了这种理解如何可能有助于在Ti-64样品中的宏区的表征。
The presence of macrozones (or micro-textured regions) in Ti-6Al-4V (Ti-64) was shown to be a potential cause to the onset of cold dwell fatigue which reduces fatigue life significantly. Past research has demonstrated the potential of using ultrasonic testing for macrozone characterization, with the variation of ultrasound attenuation, backscatter and velocity in the presence of macrozones. However, due to the complexity of the microstructure, some physical phenomena that were observed are still not well understood. In this study, we propose the use of finite-element polycrystalline models to provide us with a means to systematically study the wave-macrozone interaction. Through this investigation performed using two-dimensional models, we are able to identify important correlations between macrozone characteristics (size, shape and texture) and ultrasound responses (attenuation, backscatter and velocity). The observed behaviours are then validated experimentally, and we also highlight how this understanding can potentially aid with the characterization of macrozones in Ti-64 samples.