Laser-ultrasonic measurement of microstructure evolution during metals processing

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Proceedings titleRTO Meetings Proceedings 9
ConferenceNATO RTO Workshop I - Intelligent Processing of High Performance Materials, May 13-14 1998, Brussels, Belgium.
AbstractLaser-ultrasonics, a technique based on the generation of ultrasonic waves by a pulsed laser and on their detection by a laser interferometer, was used to monitor microstructure evolution during austenitization and phase transformations of A36 and IF steels, and during the sintering of a green powder metal iron compact. Ultrasonic attenuation measurements allowed the observation of grain growth during austenitization and of nucleation and growth during phase transformations. A calibration based on the metallographic evaluation of austenite grain sizes on quenched steel samples was obtained to quantitatively relate ultrasonic attenuation to austenite grain sizes. Ultrasonic velocity measurements also allowed the monitoring of the first two stages of the sintering process in a green powder metal iron compact. The laser-ultrasonic technique provided, in real-time, microstructural information using traditional metallographic techniques. The results presented in this paper establish laser-ultrasonics as a powerful laboratory tool to study microstructural evolution at high temperatures.
Publication date
AffiliationNRC Industrial Materials Institute; National Research Council Canada
Peer reviewedYes
NPARC number21273314
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Record identifier2cccfcdc-8d53-4e6b-bbfb-60817f3fa817
Record created2015-01-07
Record modified2016-05-09
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