Characterization of Electron Beam Welded Non-Oriented Electrical Steel with Magnetic Barkhausen Noise

2014 ◽  
Vol 605 ◽  
pp. 39-42 ◽  
Author(s):  
Polykseni Vourna
Keyword(s):  
Mechanical Properties ◽  
Magnetic Properties ◽  
Electron Beam ◽  
Electrical Steel ◽  
Electron Beam Welding ◽  
Magnetic Measurements ◽  
Barkhausen Noise ◽  
Magnetic Barkhausen Noise ◽  
Electrical Steels

In this paper the influence of Electron Beam Welding (EBW) on the microstructure, mechanical and magnetic properties of Non-Oriented Electrical steels was presented and evaluated. Single pass welds free of defects were produced at welding speeds and pulsed currents following a predesigned protocol. The samples microstructure and the macrohardness tests were concluded with the magnetic measurements (Barkhausen Noise) in order to correlate the structural and mechanical properties with the magnetizing behavior of Non-Oriented Electrical Steel.

Microstructural Magnetic Characterization of Annealed Non-Oriented Electrical Steel

2018 ◽  
Vol 915 ◽  
pp. 190-195
Author(s):  
Evangelos Hristoforou ◽  
Athanasios G. Mamalis
Keyword(s):  
Magnetic Properties ◽  
Magnetic Permeability ◽  
Electrical Steel ◽  
Barkhausen Noise ◽  
Magnetic Barkhausen Noise ◽  
Magnetic Characterization ◽  
Microstructural Changes ◽  
Wide Range ◽  
Nondestructive Characterization

The present paper investigates the utilization of the magnetic Barkhausen noise and magnetic permeability methods for the nondestructive characterization of annealed non-oriented electrical steel samples which were isothermally annealed in a wide range of temperatures (400°C – 950°C) and subsequently cooled in air. The resulting magnetic properties were compared with the microstructural changes occurring during annealing.

Correlation of Microstructure to Macroscopic Magnetic Measurements on Electrical Steels

2011 ◽  
Vol 495 ◽  
pp. 257-260 ◽  
Author(s):  
Polykseni Vourna ◽  
Aphrodite Ktena
Keyword(s):  
Easy Axis ◽  
Annealing Temperature ◽  
Electrical Steel ◽  
Magnetic Measurements ◽  
Barkhausen Noise ◽  
Magnetic Barkhausen Noise ◽  
Electrical Steels ◽  
Reversal Mechanism ◽  
Domain Wall Propagation ◽  
Scanning Electron

Results of an experimental study of electrical steel annealed at 500, 600, 700 °C and subsequently cooled via quenching or air, are presented. The samples have been characterized with respect to their magnetic properties using Magnetic Barkhausen Noise (MBN) and major and minor loop (B-H) measurements. MBN increases slightly with the annealing temperature especially in the quenched samples. The B-H loops suggest that the prevalent magnetization reversal mechanism in the air cooled samples is domain wall propagation, while in the quenched samples non 180odomain rotation seems to be significant approaching the high induction region. Scanning Electron Microscopy studies show a more homogeneous texture after annealing which in the case of the quenched samples is accompanied by not fully formed grain boundaries and orientation along he easy axis

scholarly journals Identification of Grain Oriented SiFe Steels Based on Imaging the Instantaneous Dynamics of Magnetic Barkhausen Noise Using Short-Time Fourier Transform and Deep Convolutional Neural Network

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 118
Author(s):  
Michal Maciusowicz ◽  
Grzegorz Psuj ◽  
Paweł Kochmański
Keyword(s):  
Fourier Transform ◽  
Barkhausen Noise ◽  
Magnetic Barkhausen Noise ◽  
Short Time Fourier Transform ◽  
Deep Convolutional Neural Networks ◽  
Electrical Steels ◽  
New Approach ◽  
Time Frequency ◽  
Short Time

This paper presents a new approach to the extraction and analysis of information contained in magnetic Barkhausen noise (MBN) for evaluation of grain oriented (GO) electrical steels. The proposed methodology for MBN analysis is based on the combination of the Short-Time Fourier Transform for the observation of the instantaneous dynamics of the phenomenon and deep convolutional neural networks (DCNN) for the extraction of hidden information and building the knowledge. The use of DCNN makes it possible to find even complex and convoluted rules of the Barkhausen phenomenon course, difficult to determine based solely on the selected features of MBN signals. During the tests, several samples made of conventional and high permeability GO steels were tested at different angles between the rolling and transverse directions. The influences of the angular resolution and the proposed additional prediction update algorithm on the DCNN accuracy were investigated, obtaining the highest gain for the angle of 3.6°, for which the overall accuracy exceeded 80%. The obtained results indicate that the proposed new solution combining time–frequency analysis and DCNN for the quantification of information from MBN having stochastic nature may be a very effective tool in the characterization of the magnetic materials.

Correlation of Magnetic Barkhausen Noise with Microstructure in the In-Depth Direction of a Railhead

2014 ◽  
Vol 605 ◽  
pp. 677-680
Author(s):  
Charalampos Sokos
Keyword(s):  
Mechanical Properties ◽  
Vital Role ◽  
Barkhausen Noise ◽  
Magnetic Barkhausen Noise ◽  
Damage Initiation ◽  
Depth Direction ◽  
Non Destructive ◽  
Evaluation Techniques ◽  
Magnetic Steel

The characterization of microstructures, mechanical properties, deformation, damage initiation, and growth by Non-Destructive Evaluation techniques is assuming a vital role in various materials. In this paper, the use of Magnetic Barkhausen Noise technique for characterization of mechanical properties in magnetic steel would be discussed. The results have shown that hardening depth and its quality with respect to the microstructure in induction hardened specimens could also be established using the Magnetic Barkhausen Noise technique.

Use of Superficial Magnetic Techniques to Evaluate the Mechanical Properties of Duplex Stainless Steels

2011 ◽  
Vol 495 ◽  
pp. 253-256
Author(s):  
Christina Giannouli
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Magnetic Properties ◽  
Stainless Steels ◽  
Tensile Deformation ◽  
Magnetic Measurements ◽  
Barkhausen Noise ◽  
Exponential Relationship ◽  
Two Phase ◽  
Magnetic Techniques

Aim of this study is the correlation among magnetic properties, tensile deformation and microstructure of the duplex stainless steel 2205. This correlation is achieved by the magnetic ferrite phase of the two phase microstructure. The amount of Barkhausen noise for a given material is linked with the amount of impurities, crystal dislocations, etc. and can be a good indication of mechanical properties of the material. Specimens of the alloy DSS2205 were tested under tensile deformation in different percentages and the magnetic measurements were taken online, during the tensile deformation. The measurements of the parameters of BHN combined with the percentages of the deformations and their graphic plot showed an exponential relationship. Microstructure studied with SEM technique. Macro hardness also measured and its measurements compared with those of BHN. The resultant plots showed a linear proportion among them.

Magnetic Barkhausen Noise Characterization of the Recrystallization of a Non-Oriented Electrical Steel after Cold Rolling at Different Angles to the Hot Rolling Direction

2018 ◽  
Vol 941 ◽  
pp. 274-279
Author(s):  
You Liang He ◽  
Mehdi Mehdi ◽  
Erik J. Hilinski ◽  
Afsaneh Edrisy
Keyword(s):  
Magnetic Properties ◽  
Cold Rolling ◽  
Hot Rolling ◽  
Electrical Steel ◽  
Electron Backscatter Diffraction ◽  
Rolling Direction ◽  
Barkhausen Noise ◽  
Magnetic Barkhausen Noise ◽  
Final Annealing ◽  
Steel Sheets

Non-oriented electrical steel sheets are the most commonly used material for the manufacturing of magnetic cores for electric motors and generators. The microstructure and texture of the steel after final annealing have a significant effect on the magnetic properties of the lamination core. To investigate the effect of cold rolling and annealing on the magnetic properties of the steel sheets, a 0.9 wt% Si non-oriented electrical steel was cold rolled at different angles to the hot rolling direction (HRD) and annealed at various temperatures (600°C to 750°C) to produce dissimilar microstructures. The progress of recrystallization was characterized by electron backscatter diffraction (EBSD), and the magnetic response of the steel at various stages of recrystallization was evaluated by magnetic Barkhausen noise (MBN). A number of MBN parameters, e.g. the root mean square, the smoothed envelope, the peak, the full width at half maximum (FWHM) of the envelope, the time integral of the MBN signals and the MBN energy, were analyzed with respect to the fraction of recrystallization during annealing. The results show that cold rolling at different angles to the hot rolling direction induces various deformation microstructures and stored energies, which, in turn, lead to considerably different recrystallization behaviours during annealing. The difference in recrystallization of these materials is also reflected in the MBN parameters.

Metallurgical, Mechanical and Magnetic Properties of Electrical Steel Sheets in TIG and PLASMA Welding

2013 ◽  
Vol 543 ◽  
pp. 479-482
Author(s):  
Polykseni Vourna ◽  
Aphrodite Ktena
Keyword(s):  
Magnetic Properties ◽  
Electrical Steel ◽  
Magnetic Measurement ◽  
Plasma Welding ◽  
Mechanical Grinding ◽  
Electrical Steels ◽  
Steel Sheets ◽  
Polishing Procedures ◽  
Electrical Steel Sheets

The influence of Tungsten Insert Gas (TIG) and Plasma welding on the microstructure, mechanical and magnetic properties of non-oriented electrical steels is presented and evaluated. Samples of sizes of 5.5 cm x 5.5cm x 2.0 mm were prepared from stock plate, installed on the welding table and welded at welding speeds and pulsed currents following a predesigned protocol. The samples microstructure was studied using SEM after standard mechanical grinding and polishing procedures. The characterization of the samples is concluded with microhardness tests and magnetic measurement (Barkhausen Noise) on TIG and Plasma welded joints in order to investigate the influence of welding on the magnetizing behavior of a high Si-alloyed grade of non-oriented electrical steel.

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