Laser-Ultrasound-Based Grain Size Gauge for the Hot Strip Mill

Author:

Malmström MikaelORCID,Jansson Anton,Hutchinson Bevis,Lönnqvist Johan,Gillgren Lars,Bäcke Linda,Sollander Hans,Bärwald Matthias,Hochhard Sascha,Lundin Peter

Abstract

The paper summarizes the creation of a robust online grain size gauge for a hot strip mill. A method and algorithm for calculating the grain size from the measured ultrasonic attenuation is presented. This new method is self-calibrating, does not rely on a geometrical reference sample and can cope with the effects of diffraction on the attenuation. The model is based on 52 quenched samples measured with more than 23,000 laser ultrasonics shots and has a correlation coefficient R2 of 0.8. Typical online laser ultrasonic measurements from the hot strip mill and the calculated grain size versus length are presented for a couple of steel strips.

Funder

The strategic innovation program for Metallic material, by Vinnova, the Swedish Energy Agency, and Formas

Publisher

MDPI AG

Subject

Fluid Flow and Transfer Processes,Computer Science Applications,Process Chemistry and Technology,General Engineering,Instrumentation,General Materials Science

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