Abstract
The volume fraction of the primary α phase affects the mechanical and processing properties of the dual-phase titanium alloy, its online detection is necessary and important for product quality control. In this study, samples with different microstructural characteristics were obtained by solution treated from 920 °C to 1000 °C, and the volume fraction of the primary α phase was counted by Image-Pro Plus software. Then, calculate the velocity of ultrasonic longitudinal waves in different samples and time-frequency analysis according to the signals obtained from the laser ultrasonic experiment. Finally, a prediction model of the volume fraction of the primary α phase linearly related to the ultrasonic longitudinal wave velocity was established, and the linear fit has a higher R2 than 0.96. This study can provide a reference for the online detection of phase volume fraction.
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