Characterization of the magnetic easy axis in pipeline steel using magnetic Barkhausen noise

Krause, Thomas W.; Clapham, L.; Atherton, D.L.

doi:10.1063/1.356561

Cited by 90 publications

(51 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A higher TF and a lower b parameter indicated more easy axes aligned in the plane of interest for MBN, and more easy axes present are associated with a higher MBN energy. [26] The fit associated with the b parameter appeared to be slightly better than TF for the fully processed sample. This was attributed to the fact that the calculation of b involves every grain in the scan area, and accounts for the easy axis contribution from the {hk0} planes.…”

Section: Fully Processedmentioning

confidence: 91%

Local Magnetic Properties in Non-oriented Electrical Steel and Their Dependence on Magnetic Easy Axis and Misorientation Parameters

Gallaugher

Samimi

Krause

et al. 2015

Metall Mater Trans A

Self Cite

View full text Add to dashboard Cite

An understanding of how material parameters, especially orientation and misorientation, influence the magnetic properties of non-oriented electrical steel (NOES) is important for improving the efficiency of the material in service. In this study, the local magnetic properties were measured using magnetic Barkhausen noise (MBN) on different test locations on different strips of NOES material. Local variations in magnetic properties, texture, and misorientation were revealed. A new interpretation for misorientation, called the easy axis misorientation (EAM), was created to describe the alignment of the magnetic easy axes between neighboring grains. This new EAM, visualized as a single value parameter or graphed as a distribution, was shown to be more effective at predicting the isotropic magnetic properties than previously used texture parameters based on standard orientation/misorientation definitions. It was found that a larger EAM value, especially when associated with a lower small angle EAM intensity distribution, was associated with a larger MBN energy. A larger MBN energy has been previously associated with lower losses, and therefore a greater material efficiency.

show abstract

Section: Fully Processedmentioning

confidence: 91%

Local Magnetic Properties in Non-oriented Electrical Steel and Their Dependence on Magnetic Easy Axis and Misorientation Parameters

Gallaugher

Samimi

Krause

et al. 2015

Metall Mater Trans A

Self Cite

View full text Add to dashboard Cite

show abstract

“…9) (called the magnetic Barkhausen effect), or by an acoustic sensor (the acoustic Barkhausen effect). Studies indicate that the magnetic Barkhausen effect in many materials is primarily due to the motion of 180° domains, and its interactions with dislocation tangles [68,69], whereas the acoustic Barkhausen effect is due to magnetostrictive strain from the motion of non-180 o domain walls [70]. The number of Barkhausen counts depends on the permeability and conductivity of the sample, the density of domain walls at the applied field, the average critical velocity of a domain wall when it is released from pinning sites, and the average change in the local magnetic induction due to unit displacement per unit area of domain walls [70].…”

Section: Magnetic Barkhausen Effectmentioning

confidence: 99%

Roadmap for Nondestructive Evaluation of Reactor Pressure Vessel Research and Development by the Light Water Reactor Sustainability Program

Smith¹,

Nanstad²,

Clayton³

et al. 2012

View full text Add to dashboard Cite

“…To quantify the intensity of the MBN signal in terms of a single value, an MBN energy parameter was used as in previous studies [6,8,22],…”

Section: Flux Controlmentioning

confidence: 99%

Control of flux in magnetic circuits for Barkhausen noise measurements

White

Krause

Clapham

2007

Meas. Sci. Technol.

View full text Add to dashboard Cite

The consistency of magnetic Barkhausen noise (MBN) measurements under applied sinusoidal magnetic field control and sinusoidal magnetic circuit flux control was investigated under variable circuit permeability conditions. A U-core electromagnet was used to provide the alternating magnetic excitation. The magnetic circuit permeability was changed by varying excitation magnet lift-off and by using samples with known magnetic anisotropy. By controlling the circuit magnetic flux, measured as the flux in one of the U-core poles near the sample, MBN measurements were found to be consistent and independent of the excitation magnet lift-off in both a Si-Fe steel sample and an interstitial free (IF) steel sample at peak sample flux densities greater than 1.16 T and 0.29 T respectively. Consistency within a 95% confidence level was demonstrated for lift-off values of 0.6 mm or less, with decreasing sensitivity to lift-off observed at higher fluxes. MBN anisotropy measurements were also performed using both field control and flux control. Under field control conditions a component of the anisotropy signal was found to be dependent on the magnetic circuit permeability. This permeability dependence was absent when using flux control. The results demonstrated that flux control should be used when performing MBN measurements on samples where lift-off may be an issue, as values obtained will have less dependence on the excitation magnet characteristics than when field control is used.

show abstract

Characterization of the magnetic easy axis in pipeline steel using magnetic Barkhausen noise

Cited by 90 publications

References 10 publications

Local Magnetic Properties in Non-oriented Electrical Steel and Their Dependence on Magnetic Easy Axis and Misorientation Parameters

Local Magnetic Properties in Non-oriented Electrical Steel and Their Dependence on Magnetic Easy Axis and Misorientation Parameters

Roadmap for Nondestructive Evaluation of Reactor Pressure Vessel Research and Development by the Light Water Reactor Sustainability Program

Control of flux in magnetic circuits for Barkhausen noise measurements

Contact Info

Product

Resources

About