In this work, the ultrasound attenuation in nodular cast iron was evaluated by using three different methodologies, here designated as the A, B, and C techniques. Six machined cast iron samples were tested, using two broadband transducers of 8 and 20 MHz in the pulse-echo configuration by immersion. The sample micrographic images were analyzed for microstructure characterization and graphite nodules size determination. Two experimental studies were accomplished: (1) evaluation of the performance of the A, B, and C techniques, and (2) determination of the reflection coefficient for different frequency values and its influence in the attenuation results. It was found that the attenuation exhibits a power law frequency dependence, with a very high coefficient of determination, which can be considered as a quasi-rayleigh regime. Although the present problem deals with nodular cast iron, it can be generalized to other scattering media.
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