SQUID NDE Apparatus and Magnetic Calibration to Detect Degradation in Duplex Stainless Steel

[+] Author and Article Information
S. Evanson, M. Otaka, K. Hasegawa

Department of Industrial Technology, University of Bradford, Bradford BD7 1DP, England

J. Eng. Mater. Technol 114(1), 41-45 (Jan 01, 1992) (5 pages) doi:10.1115/1.2904138 History: Received October 01, 1990; Revised April 10, 1991; Online April 29, 2008


We report on apparatus for the magnetic material characterization of a wide range of steel grades of high and low magnetic permeability. The instrument has been used to detect thermal aging in Duplex steel by the measurement of the residual magnetization (Br ) of test specimens. A method to estimate the value of Br by remote measurements up to 200 mm from a specimen is described. The results are compared with data from conventional hysteresis loop measurements.

Copyright © 1992 by The American Society of Mechanical Engineers
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