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

Abstract

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.

Effect of hot band grain size on development of textures and magnetic properties in 2.0% Si non-oriented electrical steel sheet

“…Accordingly, <100> is the easiest direction and <111> the hardest direction for magnetization [1][2][3]. As reported elsewhere [10][11][12]18,41,42], the dependency of the magneto- The values of () Ah were calculated from the annealing textures of both samples for seven inplane angles . In Fig.…”

Decoupling the effect of stress and microstructure on MBN response in cast Q1N steel

“…The temporary domain wall pinning is the result of various microstructural parameters, such as inhomogeneities in the form of carbides, inclusions and precipitates [10,13] as well as plastic deformation involving dislocation structure [14]. Grain size [15], texture [16] and phase change [17] can also affect the domain structure, which, in turn, modifies interactions with domain wall pinning sites. Size, density, distribution and strength of pinning sites have significant effects on the critical magnetic field required to start domain wall motion [18].…”

Towards a Physics Based Model of Magnetic Barkhausen Noise in Steel

“…Magnetic Barkhausen noise (MBN) demonstrates sensitivity to material condition [1] and therefore, has been considered for non-destructive monitoring of ferromagnetic structures. However, MBN is sensitive to presence of impurity elements, carbides and inclusions, which pin domain walls [8], plastic deformation, which carry dislocations [11], the presence of residual [15,16] and applied stress [12,13], and a large number of material parameters including steel surface condition [17], grain size [18], carbon content [19], crystallographic texture [20], and microstructure [21]. Form of the domain structure is determined by previous and current magnetization states.…”