Studies of the effect of surface roughness in the behaviour of ultrasonic signals in AISI-SAE-4340 steel: spectral and wavelets analysis
by Antonio J. Salazar; Edda C. Rodríguez
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 6, No. 3/4, 2011

Abstract: This study reports the influence of surface roughness on the characterisation, through the use of ultrasonic signals, of AISI-SAE 4340 steel samples. The samples were prepared with varying surface roughnesses, applied through mechanical methods and measured using a Mitutoyo Surfest-211. A normal incidence direct contact pulse-echo method was applied, using transducers of 5, 7.5 and 10 MHz, all with a 0.375 inch diameter. Fundamental spectral and wavelet signal analysis allowed for quantitative determination of a number of characteristics. Specific behaviours were detected, which varied according to the frequency of the probe. The methods proved to be complementary to each other, which contributed for a more complete evaluation and characterisation of the samples. This study serves as an initial step in the development of a thorough quantitative characterisation method of materials with different internal and surface defectology. Further studies and their findings have been and will be presented in additional articles.

Online publication date: Thu, 20-Oct-2011

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