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GRAINS SIZE CHARACTERIZATION BY WAVES ULTRASONICFREQUENCY

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Journées COFREND 2008 2008

GRAINS SIZE CHARACTERIZATION BY WAVES ULTRASONICFREQUENCY

A. Badidi Bouda, R. Halimi, A. Mebtouche, W. Djerir

Abstract : In this paper we propose an experimental study of the steel grains size effect on the shiftfrequency of the ultrasonic waves being propagated in this material. By suitable heat treatment on samples resulting from the same bar, we have obtained identical samples butwith different mean grains sizes. We have then measured the ultrasonic shifts frequency after propagation in the material. The results obtained show a direct effect on the meangrains sizes on the ultrasonic frequency. These results, in conformity with the theory, showthe possibility of characterizing a material grains size by a nondestructive method:ultrasounds.It is known that a material characterization is possible through the measurement of someultrasonic parameters such as propagation velocities and attenuation coefficients. Wepropose a method which exploits the frequency and whose measurement is easy.

Theseresults open way to a more inclusive and nondestructive characterization of materials byultrasounds.

Keywords : ultrasonic frequency, propagation velocities, attenuation coefficients, nondestructive characterization

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