Creep Damage Evaluation of Titanium Alloy Using Nonlinear Ultrasonic Lamb Waves

Creep Damage Evaluation of Titanium Alloy Using Nonlinear Ultrasonic Lamb Waves
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利用非线性超声兰姆波评估钛合金的蠕变损伤

DOI:
10.1088/0256-307x/29/10/106202
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发表时间:
2012-10
影响因子:
3.5
通讯作者:
Chen Ding-Yue
Chen Ding-Yue
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Xiang Yan-Xun;Deng Ming-Xi;Xuan Fu-Zhen;Chen Hu;Chen Ding-Yue

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使用超声兰姆波的非线性效应测量耐高温钛合金 Ti60 的蠕变损伤。结果表明,兰姆波的归一化声学非线性随蠕变损伤呈现出“增加-减少”趋势的变化。基于金相研究,分析了微观结构演化对非线性兰姆波传播的影响,结果表明,归一化声学非线性由于早期析出体积分数和位错密度的增加而增大,而在位错变化和材料中微孔萌生的综合作用下,归一化声学非线性减小。非线性兰姆波展现了评估金属剩余蠕变寿命的潜力。
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 acoustic 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.
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