A development of swept-frequency eddy current for aging characterization of heat resistant steel
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Author list: Kiattisaksri P., Phung-On I., Poopat B.
Publisher: IOS Press
Publication year: 2017
Journal: International Journal of Applied Electromagnetics and Mechanics (1383-5416)
Volume number: 55
Issue number: 2
Start page: 279
End page: 287
Number of pages: 9
ISSN: 1383-5416
eISSN: 1875-8800
Languages: English-Great Britain (EN-GB)
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Abstract
This study presents an application of the swept-frequency eddy current (SFEC) technique for characterization of aging conditions of 5Cr-0.5Mo heat resistant steel by a U-shaped, eddy current probe. An optimal eddy current probe was established and employed to investigate the specimens under different simulated service conditions. Sweep frequencies from 500 to 10,000 Hz were generated to measure the impedance changes using a precision LCR meter. As results, the normalized impedances showed the highest differences in each aging condition at the frequency of 3,200 Hz. Microstructural observations were utilized to give details of the differences in microstructures among aged conditions, which related to the carbide precipitation characteristics of the specimens. In addition, a micro-hardness was tested on the carbide colonies in complement the aged conditions. The results showed that the hardness correlated well to the normalized impedances obtained from the swept-frequency eddy current testing. ฉ 2017 - IOS Press and the authors. All rights reserved.
Keywords
carbide precipitates, heat-resistant steel, swept-frequency
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