Abstract
The microstructure of dual-phase titanium alloy is more complex than that of single-phase metallic materials, and its mechanical properties have a larger adjustment range. Online detection of the grain size of dual-phase titanium alloys is meaningful for improving product quality and controlling production costs. In this study, samples with different microstructures were obtained by heat treatment. Then, the attenuation coefficients of the ultrasonic wave were calculated by the experimental signals. Combined with metallographic images, the relationship between the attenuation coefficient and microstructure was analyzed. Finally, characterization models of the average grain size of dual-phase titanium alloys based on ultrasonic attenuation were established. In the Rayleigh region, the attenuation coefficient is proportional to the third power of the grain size and the fourth power of the frequency. This study can provide a reference for the online detection of grain size of metallic materials with complex microstructure based on laser ultrasonic technology.
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