Untersuchungen zur Anwendung des Impuls- Wirbelstromverfahrens für die zerstörungsfreie Prüfung von austenitischen Komponenten / Investigations on the application of the pulsed eddy current method to nondestructive testing of austenitic components / Etudes pour P’utilisation de la methode des courants de Foucault a impulsions pour essais non destructifs des composantes austenitiques

In this study, coil sensors that are used with a pulsed eddy current (PEC) were designed and fabricated. The proposed sensor is a differential send-receive type that eliminates the voltage induced by the direct field from the exciting coil in a PEC probe. The signal from the sensing coil is generated only on a metal specimen. For the experiment, various metal plates of different conductivities and aluminum plates of different thicknesses from 1 mm to 25 mm were prepared. A voltage square pulse was applied to an exciting coil, and the output from the sensing coil was captured by a digital oscilloscope. The applied voltage was approximately 20 volts at its greatest with a current peak of approximately 15 amperes. A 10% variation of the thickness of an aluminum plate of 20 millimeter thick was measured.

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A Pulsed Eddy Current Method for Examining Thin-Walled Stainless Steel Tubing

Review of Progress in Quantitative Nondestructive Evaluation ◽

10.1007/978-1-4613-0979-6_99 ◽

1988 ◽

pp. 1695-1702

Author(s):

Chris A. Pickett ◽

D. W. Koerner ◽

W. E. Deeds ◽

C. V. Dodd

Keyword(s):

Stainless Steel ◽

Eddy Current ◽

Current Method ◽

Eddy Current Method ◽

Stainless Steel Tubing ◽

Pulsed Eddy Current ◽

Steel Tubing ◽

Thin Walled

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Assessment of the Properties of AISI 410 Martensitic Stainless Steel by an Eddy Current Method

Materials ◽

10.3390/ma12081290 ◽

2019 ◽

Vol 12 (8) ◽

pp. 1290 ◽

Cited By ~ 1

Author(s):

Huayu Zhang ◽

Zhiheng Wei ◽

Fengqin Xie ◽

Baohai Sun

Keyword(s):

Stainless Steel ◽

Thermal Treatment ◽

Nondestructive Testing ◽

Eddy Current ◽

Martensitic Stainless Steel ◽

Surface Hardness ◽

Current Method ◽

Eddy Current Method ◽

Current Output ◽

The Relationship

Based on electromagnetic theory, metallurgical characteristics can be detected by eddy current nondestructive testing technology. In this study, the relationship between the surface microstructure and the eddy current output of martensitic stainless steel AISI 410 was studied using this technology at different quenching temperatures. The mechanical properties include material hardness, microstructure types and microstructural changes after thermal treatment was evaluated. Using Vickers hardness as the surface hardness index of AISI 410 steel, the relationship between eddy current output signal, in terms of impedance and inductance, and sample surface hardness was studied and the effects of different quenching temperatures on the steel’s surface hardness was examined. In addition, the change of microstructure types of AISI 410 steel after thermal treatment was detected by the eddy current nondestructive testing method, and the results were verified by metallographic microscopy.

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