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Characterizing Non-Metallic Inclusions in Steel by Ultrasonic Spectrum

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Ultrasonic characterization of non-metallic inclusions in steel can be largely categorized into two aspects, i.e., time-domain and frequency-domain characterizations. In general, characterization parameters in time domain are insensitive to the type, location, and size of non-metallic inclusions; meanwhile, traditional frequency-domain characterization parameters cannot represent the features of inclusions generally and accurately due to that they are calculated by several key points on spectrum curve. Therefore, critical spectrum parameters calculated by all points on spectrum curve are put forward to characterize the depth and size of non-metallic inclusion, including spectrum energy, waveform factor and kurtosis coefficient. Simulations and experiments of Al2O3 inclusions in galvanized sheet were carried out by 50 MHz immersion spot focusing ultrasonic transducer in pulse-echo mode to testify the validity of the proposed parameters. The depths of inclusions were 0.45–0.95 mm in simulation, while the sizes were 0.03–0.20 mm. Results of both methods indicate that the three new parameters all have specific relationships with the depth and size of non-metallic inclusions, and they are more sensitive to the change of the size. Furthermore, the qualitative characterization of the depth and size of non-metallic inclusion can be achieved by the new parameters. Especially, the quantitative characterization of inclusion depth is tentatively in reach.
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Document Type: Research Article

Publication date: January 1, 2018

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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