Effect of demagnetizing action of an interface on the field of surface flaws upon magnetization with an attached electromagnet

Gusev, A. P.; Kosovets, S. A.

doi:10.1134/s1061830906050044

Cited by 5 publications

(3 citation statements)

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“…It is unable to detect further magnetisation in the deep subsurface and that involving the effect of harder microstructural features due to weak magnetising field strength. The low carbon steel will tend to demagnetise faster due to higher magnetisation than the high carbon steel [22]. Hence, the ascending part of the HFMBN profile starts increasing earlier in the low carbon steel than that in the high carbon steel.…”

Section: Effect Of Isothermally Annealed Microstructures On the Mbn Pmentioning

confidence: 95%

“…sample and hence the magnetisation range are also smaller. It has been considered that the surface of a ferromagnetic material undergoes faster demagnetisation than the subsurface and bulk due to the dominant effect of surface magnetic free poles and that a material with a higher magnetisation will have a larger demagnetisation effect than the material with a lower magnetisation [22,23]. Due to high frequency of the acquired HFMBN signals (predominantly in the 70-200 kHz range), the skin-depth of the HFMBN signal is also very shallow (o20 mm), limited by the strong electromagnetic attenuation.…”

Section: Effect Of High Frequency Magnetic Excitationmentioning

confidence: 99%

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On the shape of the magnetic Barkhausen noise profile for better revelation of the effect of microstructures on the magnetisation process in ferritic steels

Vashista

Moorthy

2015

Journal of Magnetism and Magnetic Materials

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a b s t r a c tThe shape of the Magnetic Barkhausen Noise (MBN) profiles has been compared for two different methods of MBN measurements in order to reveal the true extent of the influence of different carboncontent related microstructures on the magnetisation process. The MBN profiles were measured using high frequency and low frequency MBN measurement systems on samples from low carbon 18CrNiMo5 steel and high carbon 42CrMo4 steel heat treated by isothermal annealing, spheroidising annealing and quenching and tempering processes. The high frequency MBN (HFMBN) profile shows only a single peak for all the samples due to insufficient applied magnetic field strength and shallow skin-depth of detection of HFMBN signals. The low frequency MBN (LFMBN) profile shows two peaks for all the samples due to larger magnetisation range revealing the difference in the interaction of domain walls with different microstructural features such as ferrite, pearlite, martensite and carbides. The shape of the LFMBN profile shows systematic and distinct variation in the magnetisation process with respect to carbon content and different microstructures. This study shows that the LFMBN profile reveals distinct changes in shape which could be successfully used for characterisation of different microstructural phases in ferritic steels.

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Section: Effect Of Isothermally Annealed Microstructures On the Mbn Pmentioning

confidence: 95%

Section: Effect Of High Frequency Magnetic Excitationmentioning

confidence: 99%

On the shape of the magnetic Barkhausen noise profile for better revelation of the effect of microstructures on the magnetisation process in ferritic steels

Vashista

Moorthy

2015

Journal of Magnetism and Magnetic Materials

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“…In case of electromagnetic yoke type closed loop magnetising circuit, the demagnetising effect will be smaller due to closed magnetic flux path. In addition, it is also known that the demagnetising factor, N d , is a strong function of geometry and magnetisation of the ferromagnetic sample [14,15]. For example, ferromagnetic sample with smaller length (l) to diameter (d) ratio will have larger demagnetising field which will reduce the effective magnetic field strength in the sample as compared to a sample with larger (l/d) ratio.…”

Section: Principle Of Distortion Of Tangential Magnetic Fieldmentioning

confidence: 97%

Unique correlation between non-linear distortion of tangential magnetic field and magnetic excitation voltage – Unexplored ferromagnetic phenomena and their application for ferromagnetic materials evaluation

Moorthy

2016

Journal of Magnetism and Magnetic Materials

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a b s t r a c tUnexplored ferromagnetic phenomena of non-linear distortion of tangential magnetic field (H T ) and that of excitation voltage (V E ) across the electromagnetic (EM) yoke, in the presence of a ferromagnetic material between the poles of the EM yoke, have been uniquely correlated in this study. Both the H T and V E show similar distortion behaviour, but in the opposite direction, with unique shape for each ferromagnetic sample with different microstructural conditions. Interestingly unique correlation between) profiles and their ability to distinguish different magnetisation behaviour of ferromagnetic material with different microstructures have also been discussed in this study. One to one correlation between the distortion of H T and V E shown in this study is clear evidence that both these parameters are strongly influenced by the same mechanism of magnetisation process, but in different ways. The systematic changes in the height and position of the peak and the trough on the time derivative profiles of V E and H T reflect the subtle differences in the magnetisation process for each microstructural condition of the steel. This study reveals the new scientific insight and good potential of this novel as well as very simple approach of distortion analysis of H T and V E for understanding the influence of material properties on the mechanism of magnetisation process and also their suitability for variety of applications related to materials evaluation of ferromagnetic components and structures.

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Important Factors Influencing the Magnetic Barkhausen Noise Profile

Moorthy

2016

IEEE Trans. Magn.

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Effect of demagnetizing action of an interface on the field of surface flaws upon magnetization with an attached electromagnet

Cited by 5 publications

References 1 publication

On the shape of the magnetic Barkhausen noise profile for better revelation of the effect of microstructures on the magnetisation process in ferritic steels

On the shape of the magnetic Barkhausen noise profile for better revelation of the effect of microstructures on the magnetisation process in ferritic steels

Unique correlation between non-linear distortion of tangential magnetic field and magnetic excitation voltage – Unexplored ferromagnetic phenomena and their application for ferromagnetic materials evaluation

Important Factors Influencing the Magnetic Barkhausen Noise Profile

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