Core loss reduction in grain oriented silicon steel sheets by two-sided laser scribing in the presence of a magnetic field

Jahangiri, M. R.; Bayani, Hossein; Ardestani, Mohammad; Mehdizadeh, Mohsen

doi:10.1016/j.jallcom.2021.162080

Cited by 14 publications

(5 citation statements)

References 27 publications

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“…However, the classical formula mentioned above did not take into account the influence of magnetic domain structure. A previous study [24] showed that all moving domain walls produced the micro-eddy current, and the enhanced eddy-current damping was generated by this synergistic behaviour of complex fine domain structures. Figure 8 indicated that, whether columnar or equiaxed grains, the secondary grains were mainly composed of parallel 180 • sheet-like main magnetic domains.…”

Section: Effect Of Magnetic Domains On Iron Lossmentioning

confidence: 91%

Effect of Gradient Heat Conduction on Secondary Recrystallization of Grain-Oriented Silicon Steel

Gao,

Wang,

et al. 2024

Metals

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The grain-oriented silicon steels were subjected to gradient heat conduction during high-temperature annealing by using thermal insulation cotton. The macrostructures of samples subjected to circumferential gradient heat conduction showed a “petal-like” morphology with peripheral columnar grains and central equiaxed grains, while samples subjected to transverse gradient heat conduction showed a morphology with approximately 50% columnar grains and 50% equiaxed grains. The grain orientations, magnetic domains as well as magnetic properties in different regions were detected. Results showed that the magnetic induction intensity of cylindrical grains was better than that of equiaxed grains while the iron loss was worse, which indicated that a fast heating rate during high-temperature annealing was conducive to the accuracy of Goss grains. The magnetic domains in columnar grains were wider than the equiaxed grains, which resulted in poorer iron loss. A theory of the competitive growth among secondary Goss grains was proposed. Under the condition of gradient heat conduction, once the Goss grains with the fastest heat conduction grew up abnormally, they would compete with other Goss grains which were supposed to survive in traditional processes and swallow up them until adjacent to the secondary equiaxed grains which were later developed.

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Section: Effect Of Magnetic Domains On Iron Lossmentioning

confidence: 91%

Effect of Gradient Heat Conduction on Secondary Recrystallization of Grain-Oriented Silicon Steel

Gao,

Wang,

et al. 2024

Metals

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“…The laminates, which are crucial components for transformer cores or parts of stators and rotors in electric motors [1], are shaped using various cutting technologies such as blanking, guillotine cutting, electrical discharge machining (EDM), and laser cutting. Blanking and laser cutting processes are preferred due to their high efficiency and lower costs [2,3]. In the blanking process, material shaping occurs through plastic deformation using two cutting elements: a punch and a die.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Basics of Improving the Process of Cutting Electrical Sheet Bundles with a High-Pressure Abrasive Water Jet

Szada-Borzyszkowska,

Kacalak,

Bohdal

et al. 2024

Materials

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Electrical steels are widely used in the electrical industry in the construction of many devices, e.g., power transformer cores and distribution transformers. An important parameter of electrical components that determines the efficiency of devices is energy loss during remagnetization. These losses are influenced, among other factors, by steel cutting processes. The common techniques for cutting electrical materials on industrial lines are mechanical cutting and laser cutting. High-pressure abrasive water jet (AWJ) cutting, unlike the technologies mentioned above, can ensure higher quality of the cut edge and limit the negative impact of the cutting process on the magnetic properties of sheet metal. However, the correct control of the process and the conditions of its implementation comprise a complex issue and require extensive scientific research. This work presents a new approach to cutting electric sheets, involving bundle cutting, which significantly increases the processing efficiency and the dimensional and shape accuracy of the cut details. The tests were carried out for bundles composed of a maximum of 30 sheets, ready to be joined in a stator and rotor in a motor. The influence of processing conditions on the quality of the cut edges of sheet metal, the width of the deformation zone, and the burr height were analyzed. The detailed analysis of the quality of the cut edges of electrical bundled sheets creates new possibilities for controlling the AWJ cutting process in order to obtain a product with the desired functional and operational properties.

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“…Then, a portion of fine grains with an exact {110}⟨001⟩ orientation of grains (Goss texture) absorbs other grains due to surface energy differences, resulting in the sharp Goss texture [11,12]. In addition, the role of inhibitors (second-phase particles) in promoting secondary recrystallization, such as MnS and/or AlN precipitations, has also been widely investigated, and those investigations have shown that these inhibitors are used to control the texture in the steel strip [13][14][15]. A fine dispersion of precipitates is a key requirement in the manufacturing process of Fe-3%Si grain-oriented electrical steel.…”

Section: Introductionmentioning

confidence: 99%

Texture Intensity in Grain-Oriented Steel in the Main Stages of the Production Cycle

Krawczyk,

Ścibisz,

Goły

et al. 2024

Crystals

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Grain-oriented electrical steel (GOES) has been used for many years for application in transformed cores due to its excellent magnetic properties. Magnetic properties are strongly influenced by obtaining a texture with a certain orientation (110) [001] for BCC structure. This is related to the easy direction of magnetization [001]. So far, the main research has been focused on obtaining a strong texture in the last stages of the process. The aim of the present study was to additionally trace textural changes for a slab after the continuous casting (CC) process and for a sheet after the hot rolling process. The scope of such an analysis has not been conducted before. With regard to the state after continuous casting (CC), the texture was related to measurements of the anisotropy of Barkhausen magnetic noises and the macrostructure of the slab. Based on the X-ray diffraction examinations that compared the texture intensity calculated from the texture coefficient of the slab, the hot rolled steel and the final product of grain-oriented electrical steel contained 3.1% of Si. The studies performed with the material taken from three different production steps showed high differences in the values of textural intensity indicating the occurrence of a crystallization texture, especially in the area of the columnar crystal zone; textural weakness after the hot rolling process and high texturing in the final product for textural components corresponding to the desired Goss texture.

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Core loss reduction in grain oriented silicon steel sheets by two-sided laser scribing in the presence of a magnetic field

Cited by 14 publications

References 27 publications

Effect of Gradient Heat Conduction on Secondary Recrystallization of Grain-Oriented Silicon Steel

Effect of Gradient Heat Conduction on Secondary Recrystallization of Grain-Oriented Silicon Steel

Analysis and Basics of Improving the Process of Cutting Electrical Sheet Bundles with a High-Pressure Abrasive Water Jet

Texture Intensity in Grain-Oriented Steel in the Main Stages of the Production Cycle

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