Creep Damage Evaluation of Titanium Alloy Using Nonlinear Ultrasonic Lamb Waves

The creep damage in high temperature resistant titanium alloys Ti60 is measured using the nonlinear effect of an ultrasonic Lamb wave. The results show that the normalised acoustic nonlinearity of a Lamb wave exhibits a variation of the increase-decrease" tendency as a function of the creep dam...

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Published in:Chinese physics letters 2012-10, Vol.29 (10), p.106202-1-106202-5
Main Authors: Xiang, Yan-Xun, Deng, Ming-Xi, Xuan, Fu-Zhen, Chen, Hu, Chen, Ding-Yue
Format: Article
Language:English
Subjects:
Creep (materials)
Damage
Dislocation density
Lamb waves
Nonlinearity
Precipitation
Titanium base alloys
Wave propagation
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description The creep damage in high temperature resistant titanium alloys Ti60 is measured using the nonlinear effect of an ultrasonic Lamb wave. The results show that the normalised acoustic nonlinearity of a Lamb wave exhibits a variation of the increase-decrease" tendency as a function of the creep damage. The influence of microstructure evolution on the nonlinear Lamb wave propagation has been analyzed based on metallographic studies, which reveal that the normalised acotistic nonlinearity increases due to a rising of the precipitation volume fraction and the dislocation density in the early stage, and it decreases as a combined result of dislocation change and micro-void initiation in the material. The nonlinear Lamb wave exhibits the potential for the assessment of the remaining creep life in metals.
doi_str_mv 10.1088/0256-307X/29/10/106202
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source Institute of Physics
subjects Creep (materials)
Damage
Dislocation density
Lamb waves
Nonlinearity
Precipitation
Titanium base alloys
Wave propagation
title Creep Damage Evaluation of Titanium Alloy Using Nonlinear Ultrasonic Lamb Waves
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