Use of ultrasonic waves for estimating the carburized case depth in a 8620-H steel
Keywords:Backscattered wave, Carburized case, Rayleigh wave, Amplitude, Thicknes of carburization
Non destructive estimation of the carburize case depth by using ultrasonic Rayleigh waves in a 8620- H low carbon steel. Before the experimental work the relationship between backscattered Rayleigh wave amplitude and carburized depth was investigated. These studies depend on the concept that the amplitude of backscattered waves is attenuated by the microstructure according to a combined law established between the attenuation coefficient of the carburized case and the noncarburized base material, confirming the results of the theoretical study. The amplitude of the backscattered Rayleigh wave was measured in four tests of different thicknesses of the carburized case. These measurements indicated that the amplitude of the wave decreases exponentially in accordance with the carburized case measured, as an expression which contracts with the theoretical investigation.
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