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Journal of Electronic Imaging

Imaging the transformation of hot strip steel using magnetic techniques
Author(s): E. Sharif; Cathy Bell; Peter F. Morris; A. J. Peyton
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Paper Abstract

In the production of steel strip, the temperature distribution and cooling rates along the mill run-out table have a significant effect on the steel microstructure and hence on final material properties, e.g., yield strength, tensile strength, and ductility. Noncontacting optical temperature sensors are typically used to implement feedback control of cooling, but water spray and surface emissivity irregularities can adversely affect these sensors. Ideally, the control of cooling path should account for the progress of dynamic transformation at required points rather than the strip temperature alone. There are several reports describing the use of magnetic sensors to monitor transformation. These sensors exploit the change in the electromagnetic properties as the steel progresses through transformation, for example the austenitic phase is paramagnetic and the ferritic phase is ferromagnetic below the Curie point. Previous work has concentrated on the operation and design of individual transformation sensors. This paper now describes the use of an array of electromagnetic sensors to image the progression of transformation along a sample steel block on a pilot scale industrial mill. The paper will describe the underlying physical principles, the design of the system, and present images showing the progress of transformation along one surface of the sample.

Paper Details

Date Published: 1 July 2001
PDF: 10 pages
J. Electron. Imag. 10(3) doi: 10.1117/1.1380386
Published in: Journal of Electronic Imaging Volume 10, Issue 3
Show Author Affiliations
E. Sharif, Lancaster Univ. (United Kingdom)
Cathy Bell, Corus Group plc (United Kingdom)
Peter F. Morris, Corus Group plc (United Kingdom)
A. J. Peyton, Lancaster Univ. (United Kingdom)

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