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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

Measurement of Material Properties of Steel Sheets Using Laser Ultrasonic Technology