Journal ArticleDOI
Effect of microstructure of low carbon steels on ultrasonic attenuation
Bongyoung Ahn,Seung Seok Lee +1 more
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TLDR
The ultrasonic attenuation in low carbon steel with 0.04 wT% C to 0.80 wt% C was measured over a frequency range of 5 to 15 MHz, and the effects of the carbon content and normalizing temperature were analyzed.Abstract:
The ultrasonic attenuation in low carbon steel with 0.04 wt% C to 0.80 wt% C was measured over a frequency range of 5 to 15 MHz, and the effects of the carbon content and normalizing temperature were analyzed. In pure iron, the attenuation is determined from the average grain size, which increases as the normalizing temperature increases; there is a noticeable effect caused by a few large grains. In the case of the hypoeutectoid steels, the proeutectoid ferrite grain, the size of which depends on prior austenite grain size, acts as the main scatterer. The prior austenite grain size increases as the carbon content decreases and the normalizing temperature increases. The colony is responsible for scattering in the eutectoid steel; scattering by pearlite is greater than that by ferrite.read more
Citations
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Review on Structural Health Evaluation with Acoustic Emission
TL;DR: In this article, a review introduces several areas of importance in acoustic emission (AE) technology, starting from signal attenuation, which is a critical issue in any large-scale AE monitoring, but few systematic studies have appeared.
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A Comprehensive Report on Ultrasonic Attenuation of Engineering Materials, Including Metals, Ceramics, Polymers, Fiber-Reinforced Composites, Wood, and Rocks
TL;DR: In this article, the attenuation spectra are characterized in combination with four power law terms, with many showing linear frequency dependence, with or without Rayleigh scattering, and a new mechanism is proposed to explain some of the linear frequency dependencies.
Journal ArticleDOI
Characterization of microstructural phases of steels by sound velocity measurement
C. Hakan Gür,B. Orkun Tuncer +1 more
TL;DR: In this article, the effect of phases on sound velocity was investigated by measuring sound velocities for both longitudinal and transversal waves, the reference values were obtained for each individual phase.
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Evaluation of material degradation using phased array ultrasonic technique with full matrix capture
TL;DR: In this article, a new approach based on phased array ultrasonic technique (PAUT) with full matrix capture (FMC) is presented to effectively measure acoustic properties such as ultrasonic wave velocity and attenuation coefficient and to evaluate material degradation.
Journal ArticleDOI
Nondestructive investigation of the effect of quenching and tempering on medium-carbon low alloy steels
C. Hakan Gür,B. Orkun Tuncer +1 more
TL;DR: In this paper, the effect of quenching and tempering on sound velocities of steels was investigated and the authors contributed to the non-destructive control and optimisation of the quenched/tempering systems.
References
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Journal ArticleDOI
Ultrasonic attenuation by spectrum analysis of pulses in buffer rods: Method and diffraction corrections
TL;DR: In this article, a method for measuring ultrasonic attenuation as a function of frequency by spectrum analysis of broadband echoes in a buffer/specimen system is presented, and a new technique for diffraction corrections in this configuration is also presented.
Journal ArticleDOI
Ultrasonic wave attenuation spectra in steels
W. N. Reynolds,R. L. Smith +1 more
TL;DR: In this paper, the attenuation characteristics of high frequency ultrasonic waves depend on the mean grain size, the grain size distribution and on a damping term that has been associated with dislocations.
Journal ArticleDOI
Ultrasonic materials characterization
TL;DR: In this paper, the authors reviewed the progress made in applying ultrasonic attenuation measurements to the determination of such quantities as grain size and dislocation content, which enables the contributions of scattering and absorption to the total attenuation to be separated.
Journal ArticleDOI
Influence of Preferred Orientation on Ultrasonic Grain Scattering
TL;DR: In this paper, it was shown through the analysis of a two-dimensional mathematical model of the elastic anisotropy of a grain that preferred orientation tends to reduce the anisotropic factor in the grain scattering formulas.