Investigation of the Influence of Macrozones in Titanium Alloys on the Propagation and Scattering of Ultrasound

The presence of macrozones (or micro-textured regions) in Ti-6Al-4V (Ti64) 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 characterisation, with the...

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Veröffentlicht in:arXiv.org 2023-04
Hauptverfasser: Wei Yi Yeoh, Lan, Bo, Lowe, Michael J S
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description The presence of macrozones (or micro-textured regions) in Ti-6Al-4V (Ti64) 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 characterisation, 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 (FE) polycrystalline models to provide us with a means to systematically study the wave-macrozone interaction. Through this investigation performed using two-dimensional (2D) 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 characterisation of macrozones in Ti-64 samples.
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subjects Backscattering
Fatigue life
Finite element method
Microtexture
Titanium alloys
Titanium base alloys
Two dimensional models
Ultrasonic attenuation
Ultrasonic testing
title Investigation of the Influence of Macrozones in Titanium Alloys on the Propagation and Scattering of Ultrasound
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