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首页> 外文期刊>Materials Science & Engineering. A, Structural Materials: Properties, Microstructure and Processing >Characterization of solutionizing behavior in VT14 titanium alloy using ultrasonic velocity and attenuation measurements
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Characterization of solutionizing behavior in VT14 titanium alloy using ultrasonic velocity and attenuation measurements

机译：利用超声速度和衰减测量表征VT14钛合金中的固溶行为

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摘要

VT14 titanium alloy (Ti-4.5Al-3Mo-1V) was subjected to a series of heat treatments consisting of solutionizing for 1 h at the selected temperatures in range of 923-1323 K at an interval of 50 K, followed by water quenching. Hardness and optical microscopy results are correlated with ultrasonic longitudinal and shear wave velocities and attenuation in these specimens. Ultrasonic velocities and hardness decrease with solution annealing temperature (SAT) in the 923-1123 K range. Beyond 1123 up to 1223 K, they increase slightly. Beyond 1223 K, ultrasonic velocities become constant, whereas hardness increases up to 1323 K. Ultrasonic attenuation exhibits an opposite behavior to velocity and hardness. Further, for the first time, authors have shown that ultrasonic velocity can be used to identify the beta-transus temperature in this alloy. Because of non-monotonous variation of velocity and attenuation with solutionizing temperature, it was not possible to identify the SAT using any one of these parameters. Hence, a new parameter, ratio of normalized differential of ultrasonic attenuation to normalized differential of ultrasonic velocity (RNDAV) has been used, which is found to increase monotonously with SAT and hence enabling unambiguous characterization of SAT in solution annealed VT14 alloy.
机译：对VT14钛合金（Ti-4.5Al-3Mo-1V）进行一系列热处理，包括在923-1323 K的选定温度下以50 K的间隔固溶1 h，然后进行水淬。硬度和光学显微镜检查的结果与这些样本的超声波纵向和剪切波速度以及衰减相关。超声波速度和硬度会随着溶液退火温度（SAT）在923-1123 K范围内降低。从1123到1223 K，它们会略有增加。超过1223 K，超声速度变得恒定，而硬度增加到1323K。超声衰减表现出与速度和硬度相反的行为。此外，作者首次表明，超声速度可用于识别这种合金中的β-转变温度。由于固溶温度下速度和衰减非单调变化，因此无法使用这些参数中的任何一个来识别SAT。因此，使用了新的参数，即超声衰减的归一化微分与超声速度的归一化微分（RNDAV）之比，发现该参数随SAT单调增加，因此能够明确表征溶液退火的VT14合金中的SAT。

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