Laser Scribing of Grain Oriented Electrical Steel Under the Aspect of Industrial Utilization using High Power Laser Beam Sources

Rauscher, P.; Hauptmann, Jan; Beyer, Eckhard

doi:10.1016/j.phpro.2013.03.083

Cited by 15 publications

(7 citation statements)

References 3 publications

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“…The laser energy per length unit E L is known to have a significant effect on the reduction of core losses. Thus it has been commonly used to agglomerate together most of the factors that affect magnetic domains refinement during laser heating as described by Rauscher et al [9]. E L in J mm −1 can be expressed by the following equation:…”

Section: Resultsmentioning

confidence: 99%

“…It is already known that the desired effects can be achieved by several processing techniques, e.g. mechanical scribing/scratching, electrical discharge machining, plasma flame treatment, chemi-*Corresponding author: e-mail address: vpuchy@saske.sk cal etching, and also by laser scribing [3][4][5][6][7][8][9]. The laser scribing technique is based on a rapid laser-induced increase of temperature on the sheet surface causing residual stresses during subsequent cooling that refines the magnetic domains.…”

Section: Introductionmentioning

confidence: 99%

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The effects of CO2 laser and thulium-doped fibre laser scribing on magnetic domains structure, coercivity, and nanohardness of Fe-3.2Si grain-oriented electrical steel sheets

Puchý¹,

Kováč²,

Falat³

et al. 2018

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Two different laser sources, namely the CO2 laser and continuous-wave thulium-doped fibre laser were individually used to study their effects on the resulting changes in magnetic domains structure, coercivity, and nanohardness of Fe-3.2Si grain-oriented electrical steel sheets. The CO2 laser with a constant power of 30 W, constant frequency of 1 kHz and variable scribing speed in the range of 10-50 mm s −1 was used to perform the first series of five different laser scribing treatments. Separately, the second series of next five laser scribing treatments was performed using thulium-doped fibre laser operating at a constant scribing speed of 2.4 mm s −1 and variable laser power in the range of 2-10 W. The results showed that compared to the laser untreated material with a coercivity of 0.21 A m −1 , distinguishable improvements in soft magnetic characteristics (i.e., coercivity reduction) were obtained after the all laser treatments used. At the same time, lowered nanohardness values were indicated in central parts of laser scribed areas. The major effects responsible for the observed coercivity improvements are related to optimal refinement of magnetic domains structures by applied laser treatments.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effects of CO2 laser and thulium-doped fibre laser scribing on magnetic domains structure, coercivity, and nanohardness of Fe-3.2Si grain-oriented electrical steel sheets

Puchý¹,

Kováč²,

Falat³

et al. 2018

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“…The theoretically predicted core loss reduction of 70% encourages unceasing motivation for further developments of the refinement processes. 13 Our previous work 14 was focused on optimizing the laser scribing conditions of Fe-3%Si electrical steel sheets for single pulse laser regimes. The present work represents an extended and continuing research study to our preliminary investigation 15 of the effects of continues fibre laser processing on magnetic domains structure and surface changes of the same material in correlation with its resulting soft magnetic properties measured in AC magnetic field.…”

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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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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“…All these methods can induce favorable stress that refines the magnetic domains due to mechanical or thermal strains introduction. For the industrial utilization of refinement process, the socalled "laser scribing" technique is usually applied due to its no-contact nature, the high flexibility and the little damage of the surface coating [5].…”

Section: Introductionmentioning

confidence: 99%

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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Laser Scribing of Grain Oriented Electrical Steel Under the Aspect of Industrial Utilization using High Power Laser Beam Sources

Cited by 15 publications

References 3 publications

The effects of CO2 laser and thulium-doped fibre laser scribing on magnetic domains structure, coercivity, and nanohardness of Fe-3.2Si grain-oriented electrical steel sheets

The effects of CO2 laser and thulium-doped fibre laser scribing on magnetic domains structure, coercivity, and nanohardness of Fe-3.2Si grain-oriented electrical steel sheets

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

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