Measurement of Material Properties of Steel Sheets Using Laser Ultrasonic Technology

A non-contact laser ultrasound measuring system for material properties of high-strength steels was developed. This system can measure material properties such as crystal grain size by analyzing high-frequency ultrasound waveforms generated by a pulsed laser. For this purpose, a light equalizing dev...

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Bibliographic Details
Published inProcedia engineering Vol. 81; pp. 1414 - 1419
Main Authors Sano, Mitsuhiko, Ohara, Kazuhiro, Shimoda, Naoki, Tsugeno, Masashi
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 2014
Subjects
Grain size
Hot strip mill
Laser-ultrasound
Material property
Non-contact measurement
Rolling
Material property
Grain size
Hot strip mill
Rolling
Non-contact measurement
Laser-ultrasound
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Summary:A non-contact laser ultrasound measuring system for material properties of high-strength steels was developed. This system can measure material properties such as crystal grain size by analyzing high-frequency ultrasound waveforms generated by a pulsed laser. For this purpose, a light equalizing device is applied to the pulsed laser path so that the excited ultrasound can propagate a long distance without being weakened by diffusion. Therefore, the characteristics of the waveform can be captured clearly and analyzed correctly by this system. The advantages of this device were confirmed by numerical simulation of the ultrasonic propagation. The capability of this measuring system was shown by experimental measurement of various high-strength steel specimens. The measured crystal grain sizes showed good agreement with the results of SEM-EBSD observations. The measured crystal grain size also showed good correlation with the tensile test results.
ISSN:1877-7058
1877-7058
DOI:10.1016/j.proeng.2014.10.166