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This paper presents a modeling and experimental study, based on a magnetic induction spectroscopy (MIS) technique, for non-destructive evaluation of rail decarburization. The inductive sensor contained an H-shaped ferrite core, which was excited with a multi-frequency waveform over the range of approximately 1 kHz to 100 kHz. Finite-element (FE) simulation was carried out to understand the link between...
This paper presents the measurement of decarburization of steel rods with an electromagnetic sensor using an analytical model. Loss of carbon (decarburization) at the steel surface can have a significantly detrimental effect on mechanical properties of products, since hardness, fatigue, strength, and wear properties are strongly dependent on carbon content. Currently, measurement of decarburization...
This paper presents the measurement of ferrite/austenite phase fraction using a multi-frequency electromagnetic sensor. A simple analytical model was established that can describe the response of the sensor for samples containing varying fractions of ferromagnetic phase over a wide range of frequencies (100 Hz to 1 MHz). In particular, a new feature, the peak frequency of the imaginary part of the...
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