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Short time Fourier transform (STFT) has been used to study the distribution of ultrasonic energy as a function of the frequency of the wave in the backscatter and the back-wall echoes obtained from austenitic stainless steel specimens with different grain sizes in a range of 30–210μm. A 25MHz nominal frequency immersion transducer was used in pulse-echo mode for data acquisition. In specimens with...
Ultrasonic velocity measurements have been used to estimate average grain size in an AISI type 316 stainless steel. For precise ultrasonic transit time measurements, the pulse-echo-overlap technique has been used. Master graphs relating ultrasonic velocity with metallographically obtained grain size have been generated. Using these graphs, grain sizes in new specimens have been obtained. The results...
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