Core loss reduction in grain-oriented silicon steels by excimer laser scribing

Ponnaluri, Satish V.; Cherukuri, Ramachand; Molian, Pal

doi:10.1016/s0924-0136(01)00573-8

Cited by 40 publications

(27 citation statements)

References 4 publications

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“…The resultant strain is believed to cause a slip in the plane that provides the new wall boundaries. 12 …”

Section: Resultsmentioning

confidence: 99%

“…11 For the industrial utilization of refinement process, the so-called "laser scribing" technique is usually applied due to its no-contact nature, high flexibility and little damage of the surface coating. 12 Typical core loss reduction of about 10% could be achieved with several kinds of laser beam sources. The theoretically predicted core loss reduction of 70% encourages unceasing motivation for further developments of the refinement processes.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic losses reduction in grain oriented silicon steel by pulse and continuous fiber laser processing

et al. 2017

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The present paper shows the impact of different laser scribing conditions on possible reduction of magnetic losses in grain oriented electrical steel sheets. The experimental Fe-3%Si steel was taken from industrial line after final box annealing. The surface of investigated steel was subjected to fiber laser processing using both pulse and continuous scribing regimes in order to generate residual thermal stresses inducing the magnetic domains structure refinement. The magnetic losses of experimental samples before and after individual laser scribing regimes were tested in AC magnetic field with 50Hz frequency and induction of 1.5T. The most significant magnetic losses reduction of 38% was obtained at optimized conditions of continuous laser scribing regime. A semi quantitative relationship has been found between the domain patterns and the used fiber laser processing.

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“…The resultant strain is believed to cause a slip in the plane that provides the new wall boundaries. 12 …”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic losses reduction in grain oriented silicon steel by pulse and continuous fiber laser processing

et al. 2017

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“…This rapid surface displacement launches a dilatational wave that propagates the stress distribution throughout the depth of the material. The resultant strain is believed to cause a slip in the plane that provides the new wall boundaries [6].…”

Section: Resultsmentioning

confidence: 99%

“…The theoretically * corresponding author; e-mail: ipetryshynets@saske.sk predicted core loss improvement of 70% indicates the motivation for further developments of the refinement process [6].…”

Section: Introductionmentioning

confidence: 97%

Effect of Laser Scribing on Soft Magnetic Properties of Conventional Grain-Oriented Silicon Steel

et al. 2017

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The present work investigates the influence of laser scribing of grain-oriented silicon steel on the improvement of its soft magnetic properties via magnetic domains modification. The experimental material was represented by conventional Fe-3%Si grain-oriented electrical steel that was taken directly from industrial line after the final box annealing. The laser scribing treatments were applied onto the material surface in order to induce thermal stresses having crucial influence on the magnetic domains refinement. The laser scribing conditions have been optimized by introducing thermal stresses onto the experimental material surface leading to optimal refinement of final domains structures and desired magnetic softness minimization. A semiquantitative relationship has been found between the domain patterns and the used fiber laser treating method. The obtained modified domain structure led to a significant decrease in coercivity measured in DC magnetic field from 20 A/m to 12 A/m.

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“…These losses have to be reduced in order to save energy, reduce the heat and limit the frequency dependency of the magnetic properties. The promising results have been shown in grainoriented (GO) electrical steel sheets through the refinement of magnetic domain structure as a result of mechanical and/or thermal stresses implementation [1,2]. The desired effects can be achieved by mechanical scribing/scratching, electrical discharge machining, plasma flame treatment, chemical etching and also by laser scribing [3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Fiber Laser Pulse Processing on Coercivity and Nanohardness of Fe-3.2Si Grain-Oriented Electrical Steel in relation with its Surface Changes and Magnetic Domains Modifications

et al. 2017

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Fiber laser scribing of Fe-3.2Si grain-oriented electrical steel was carried out using three different laser pulse regimes, namely a single pulse laser regime, multipulse laser regime and multipulse laser regime with modulation of laser pulses. The samples were tested for coercivity and nanohardness before and after laser processing. Clear improvements in soft magnetic characteristics were observed for all the regimes using the lowest single pulse energy of 0.6 mJ. The best improvement i.e. the most significant decrease in coercivity was obtained after the regime with 5 pulses. Further increasing in both pulse energy and pulse number resulted only in detrimental effects on both magnetic and mechanical characteristics. Introduction of 50 kHz pulse modulation within 100-pulse laser regimes resulted in lower coercivity values in comparison with the same regimes without modulation. The major effects responsible for the observed improvement are related to optimal refinement and rearrangement of magnetic domains determined by the balance of laser-induced residual stresses and plastic deformation at the surface of the treated material. Thus the fiber laser pulse processing has been recognised as a useful and energy efficient tool in obtaining electrical steels for power transformers with lower core losses.

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Core loss reduction in grain-oriented silicon steels by excimer laser scribing

Cited by 40 publications

References 4 publications

Magnetic losses reduction in grain oriented silicon steel by pulse and continuous fiber laser processing

Magnetic losses reduction in grain oriented silicon steel by pulse and continuous fiber laser processing

Effect of Laser Scribing on Soft Magnetic Properties of Conventional Grain-Oriented Silicon Steel

The Influence of Fiber Laser Pulse Processing on Coercivity and Nanohardness of Fe-3.2Si Grain-Oriented Electrical Steel in relation with its Surface Changes and Magnetic Domains Modifications

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