Application of laser-ultrasonics to texture measurements in metal processing

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• 作者：Pete Bate ; Peter Lundin ; Eva Lindh-Ulmgren ; Bevis Hutchinson ; ^{bevis.hutchinson@swerea.se" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Laser-ultrasonics ; Texture ; Modelling
• 刊名：Acta Materialia
• 出版年：2017
• 出版时间：15 January 2017
• 年：2017
• 卷：123
• 期：Complete
• 页码：329-336
• 全文大小：1542 K

文摘

The paper describes in principle how information about textures can be obtained through the application of laser-ultrasonics (LUS) which can be carried out at elevated temperatures, for example in connection with hot rolling. The benefits from getting a measure of texture in this way are explained together with the proposed methodology which is based on the elastic anisotropic properties of the textured material. Measurements are made using only a single laser pulse and in real-time.

Two approaches are presented to modelling the propagation of elastic waves, ray tracing and finite difference modelling. These give consistent results but the latter provides a more complete prediction of the ultrasonic spectrum that can be quantitatively related to measured signals through a cross-correlation procedure.

Some experimental results are presented for room temperature measurements on a sheet of interstitial-free steel. Agreement between experimental data and modelling results is good and allows estimation of the 4th order coefficients of the orientation distribution function.