scholarly journals Magnetic Properties of Silicon Steel after Plastic Deformation

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4361
Author(s):  
Andries Daem ◽  
Peter Sergeant ◽  
Luc Dupré ◽  
Somsubhro Chaudhuri ◽  
Vitaliy Bliznuk ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Magnetic Properties ◽  
Stress State ◽  
Mechanical Load ◽  
Rolling Direction ◽  
Silicon Steel ◽  
Hysteresis Loss ◽  
Energy Losses ◽  
Core Energy ◽  
Load Release

The energy efficiency of electric machines can be improved by optimizing their manufacturing process. During the manufacturing of ferromagnetic cores, silicon steel sheets are cut and stacked. This process introduces large stresses near cutting edges. The steel near cutting edges is in a plastically deformed stress state without external mechanical load. The magnetic properties of the steel in this stress state are investigated using a custom magnetomechanical measurement setup, stress strain measurements, electrical resistance measurements, and transmission electron microscopic (TEM) measurements. Analysis of the core energy losses is done by means of the loss separation technique. The silicon steel used in this paper is non-grain oriented (NGO) steel grade M270-35A. Three differently cut sets of M270-35A are investigated, which differ in the direction they are cut with respect to the rolling direction. The effect of sample deformation was measured—both before and after mechanical load release—on the magnetization curve and total core energy losses. It is known that the magnetic properties dramatically degrade with increasing sample deformation under mechanical load. In this paper, it was found that when the mechanical load is released, the magnetic properties degrade even further. Loss separation analysis has shown that the hysteresis loss is the main contributor to the additional core losses due to sample deformation. Releasing the mechanical load increased the hysteresis loss up to 270% at 10.4% pre-release strain. At this level of strain, the relative magnetic permeability decreased up to 45% after mechanical load release. Manufacturing processes that introduce plastic deformation are detrimental to the local magnetic material properties.

Effect of Annealing on the Magnetic Properties of a Cold Rolled Non-Oriented Grain Electrical Steels

2009 ◽  
Vol 1243 ◽  
Author(s):  
N.M. López G. ◽  
A. Salinas R.
Keyword(s):  
Plastic Deformation ◽  
Magnetic Properties ◽  
Grain Growth ◽  
Annealing Temperature ◽  
Cold Work ◽  
Rolling Direction ◽  
Energy Losses ◽  
Hysteresis Losses ◽  
Core Losses ◽  
Rate Of Recovery

ABSTRACTThe effect of plastic deformation and subsequent annealing on the microstructure and magnetic properties (hysteresis core losses) of non-oriented grain semi-processed Si-Al electrical steel sheet are investigated. Plastic deformation of strip samples is performed by cold-rolling (5–20% reduction in thickness) along the original rolling direction. Annealing is carried out in air during 1 or 60 minutes at temperatures between 650 and 850°C. Measurements of B-H hysteresis curves are performed using a Vibrating Sample Magnetometer and characterization of annealed microstructures is carried out using optical metallography. The results show that hysteresis losses increase by a factor between 1.2 and 2.0 as the magnitude of the applied plastic deformation increases from 5 to 20% reduction in thickness. The rate of recovery of energy losses as a result of annealing depends on annealing time. Short annealing times produce full recovery of the effect of cold work and values of energy losses lower than in undeformed material. The magnitude of the additional recovery increases with strain but does not depend on annealing temperature. Long annealing times, which induce complete recrystallization, and either normal or abnormal grain growth, enhance recovery of hysteresis losses. The rate of recovery increases as both the strain and annealing temperature increase. Recovery of the deformation microstructure and internal stress relief produce only limited recovery of the magnetic properties. However, recrystallization and grain growth brings about a significant decrease in hysteresis losses.

scholarly journals Prediction of Magnetic Properties of a Plastically Deformed Steel and One Way to Measure its Plastic Deformation

2020 ◽  
Vol 20 (2) ◽  
pp. 5-13
Author(s):  
M.J. Sablik
Keyword(s):  
Plastic Deformation ◽  
Magnetic Properties ◽  
Dislocation Density ◽  
Plastic Strain ◽  
Yield Stress ◽  
Magnetic Materials ◽  
Power Law ◽  
Phenomenological Model ◽  
Magnetic Hysteresis ◽  
Hysteresis Loss

AbstractIn this paper, we use a phenomenological model based on the Jiles-Atherton-Sablik model of stress affecting the magnetic hysteresis of magnetic materials as modified when stress goes past the yield stress We use this to show that (1) the model produces sharp shearing of hysteresis curves, as seen experimentally and that (2) it also produces a step in the hysteresis loss at small residual plastic strain. We also find that the step in the hysteresis loss can be fitted to a power law, and find that the power law can be fitted by the power m=0.270, different from the mechanical Ludwik Law exponent, and reasonably close to the experimental 0.333 and 0.202. We will also suggest a method of measuring how plastically deformed the material is by suggesting how the dislocation density can be measured.

On the Mechanical Properties Determination of Armco Steel Using Magnetic Hysteresis Loop and Barkhausen Noise

2011 ◽  
Vol 495 ◽  
pp. 269-271
Author(s):  
K. Kosmas
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Magnetic Properties ◽  
Hysteresis Loop ◽  
Mechanical Load ◽  
Magnetic Hysteresis ◽  
Magnetic Hysteresis Loop ◽  
Barkhausen Noise

Magnetic properties, namely B-H loops and Barkhausen noise, have been determined with respect to mechanical load in Armco steels. The monotonic response illustrated a clearly verified knee, corresponding to the initiation of plastic deformation.

scholarly journals A New 3D Method for Reactor Core Vibration Based on Silicon Steel Lamination Rules and Application in UHV Shunt Reactors

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Fangcheng Lü ◽  
Jiayi Guo ◽  
Leilei Niu ◽  
Jianghai Geng ◽  
Yirui Pan
Keyword(s):  
Magnetic Properties ◽  
Coordinate System ◽  
Rolling Direction ◽  
Silicon Steel ◽  
Magnetic Flux Density ◽  
Total Force ◽  
3D Analysis ◽  
Coordinate Systems ◽  
Rectangular Coordinate System ◽  
Shunt Reactors

A new three-dimensional (3D) analysis method is proposed as the existing two-dimensional (2D) method has low accuracy in analysing the vibration characteristics of oil-immersed shunt reactors, such as ultrahigh-voltage (UHV) shunt reactors. First of all, a set of 3D laminated coordinate systems was defined based on silicon steel lamination rules, in which the anisotropy of magnetic properties for laminated silicon steel in the rolling direction (RD), the transverse direction (TD), and the lamination direction (LD) were considered. Then, the mapping between laminated coordinate systems and space rectangular coordinate system was established to unify the parameters in different laminated coordinate systems. With the mapping, the anisotropy of the magnetic properties in the laminated coordinate systems was transformed into a rectangular coordinate system. Next, two sets of comparative studies between the new 3D method and the traditional 2D method were carried out, which show that the 3D method has high precision and a wide application range. Finally, the relationship between air gap number and core vibration of UHV shunt reactors was studied by the new 3D method. The results show that, as the number of air gaps increases, the magnetic flux density and the total force area of Maxwell force are increased, resulting in the intensification of core vibration. The conclusions of this paper are helpful for the design of large oil-immersed reactors.

scholarly journals Influence of plastic deformation on the magnetic properties of Heusler MnAu2Al

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Emily E. Levin ◽  
Daniil A. Kitchaev ◽  
Yolita M. Eggeler ◽  
Justin A. Mayer ◽  
Piush Behera ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Magnetic Properties

Percolation Effects in the Mechanical Properties of Granular Ni-A12O3 thin films

1990 ◽  
Vol 195 ◽  
Author(s):  
T.E. Schlesinger ◽  
A. Gavrin ◽  
R.C. Cammarata ◽  
C.-L. Chien
Keyword(s):  
Thin Films ◽  
Mechanical Properties ◽  
Plastic Deformation ◽  
Magnetic Properties ◽  
Percolation Threshold ◽  
Volume Fraction ◽  
Electrical And Magnetic Properties ◽  
Low Load

ABSTRACTThe mechanical properties of sputtered Ni-Al2O3 granular thin films were investigated by low load microharaness testing. It was found that the microhardness of these films displayed a percolation threshold at a nickel volume fraction of about 0.6, below which the hardness is greatly enhanced. This behavior is qualitatively similar to the electrical and magnetic properties of these types of films. A percolation threshold in hardness can be understood as due to a change in the mechanism for plastic deformation.

The Research of Non-Oriented Electrical Steel Processed by Stress Relief Annealing Experiments

2014 ◽  
Vol 887-888 ◽  
pp. 252-256
Author(s):  
Zhun Li ◽  
Jing Liu ◽  
Shi De Li ◽  
Ze Lin Zheng
Keyword(s):  
Magnetic Properties ◽  
Electrical Steel ◽  
Core Loss ◽  
Reference Method ◽  
Stress Relief ◽  
Hydrogen Atmosphere ◽  
Silicon Steel ◽  
Pure Hydrogen ◽  
Final Annealing ◽  
Annealing Experiments

A high grade non-oriented electrical steel final annealing product was processed by stress relief annealing experiments under pure hydrogen atmosphere using different process parameters. The samples were compared in the aspects of magnetic properties and anisotropy, then analyzed the phenomena concerned with grain size, texture and precipitates aspects. The experiments showed that the samples magnetic properties were most improved in the 850 degrees stress relief annealing experiment, thus providing a reference method for non-oriented silicon steel stress relief annealing experiments and to obtain low core loss non-oriented silicon steel.

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