Nondestructive evaluation of a crack on austenitic stainless steel using a sheet type induced current and a Hall sensor array |
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| Authors: | Jongwoo Jun Jinyi Lee |
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| Affiliation: | (1) Department of Information and Communication Engineering, Graduate School, Chosun University, 375 Seosuk-dong, Dong-gu, Gwangju, 501-759, Korea;(2) Department of Control and Instrumentation Robot Engineering, Chosun University, 375, Seosuk-dong, Dong-gu, Gwangju, 501-759, Korea |
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| Abstract: | Austenitic stainless steels (hereafter A-STS) such as STS304 and STS316 are paramagnetic metals. However, a small amount of
partial magnetization is generated in A-STS because of the imperfect final heat treatment and mechanical processing. Surface
cracks on paramagnetic metal with a partially magnetized region (hereafter PMR) are difficult to inspect. In this paper, we
propose a method for high speed inspection and evaluation of a crack on A-STS. Cracks can be inspected with high speed by
using 64 arrayed Hall sensors (HSA) with 3.5 mm spatial resolution and a sheet type induced current (STIC). Then, a crack
can be evaluated quantitatively by using the detailed distribution of the magnetic field obtained by using single Hall sensor
scanning (SSS) around the inspected crack area. Several cracks on A-STS with partially magnetized areas were examined and
the experimental formulas were derived. |
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| Keywords: | Nondestructive evaluation Sheet type induced current Austenitic stainless steel Sensor array Sensor scanning |
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