Microstructural aspects of grain growth kinetics in non-oriented electrical steels

Sidor, Jurij J.; Kováč, František

doi:10.1016/j.matchar.2005.01.015

Cited by 29 publications

(17 citation statements)

References 15 publications

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“…5) A classical method used by metallurgists to control both the microstructure and the texture of electrical steels is to control the precipitation of second-phase particles that are able to pin the grain boundaries. 6) In silicon steels, for non-oriented, electrical steel sheets, aluminium and manganese form AlN and MnS, respectively. These non-metallic inclusions act as grain-growth inhibitors during the recrystallization.…”

Section: Introductionmentioning

confidence: 99%

Magnesium Non-metallic Inclusions in Non-oriented Electrical Steel Sheets

et al. 2011

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During routine metallographic investigations of some fully processed, non-oriented, electrical steel sheets, the typical MnS inclusions were not observed in the microstructures. In the MS-type sulphides, the manganese was substituted by magnesium. A systematic ex-situ characterisation of the non-metallic, magnesium-containing inclusions was carried out and the origin of the inclusions was proposed. The inclusions' chemistry and morphology were investigated by light microscopy and field-emission scanning electron microscopy. The non-metallic, magnesium-containing inclusions were classified as complex sulphides, oxides and spinels. Magnesium was also detected as being co-precipitated with other non-metallic inclusions, like nitrides. The form of the co-precipitated magnesium inclusions was predetermined by the shape of the thermodynamically most stable inclusions.KEY WORDS: magnesium; non-metallic inclusions; non-oriented electrical steel.

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Section: Introductionmentioning

confidence: 99%

Magnesium Non-metallic Inclusions in Non-oriented Electrical Steel Sheets

et al. 2011

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“…Grain non-oriented (GNO) electrical steels are widely used in electrical equipment from the simplest domestic appliances to hybrid and pure electric vehicles [3][4][5]. For these applications, low core losses and high permeability are required [1][2][3][4][5][6][7]; these magnetic properties are strongly influenced …”

Section: Introductionmentioning

confidence: 99%

“…For these applications, low core losses and high permeability are required [1][2][3][4][5][6][7]; these magnetic properties are strongly influenced …”

Section: Introductionmentioning

confidence: 99%

Influence of Thickness and Chemical Composition of Hot-Rolled Bands on the Final Microstructure and Magnetic Properties of Non-Oriented Electrical Steel Sheets Subjected to Two Different Decarburizing Atmospheres

Calvillo

Salinas‐Rodríguez

et al. 2017

Metals

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During electrical steel processing, there are usually small variations in both chemical composition and thickness in the hot-rolled material that may lead to different magnetic properties for the same steel grade. Therefore, it is of great importance to know the effects of such variations on the final microstructure and magnetic properties of these steels. In the present investigation, samples of a specific grade of a commercial hot-rolled grain non-oriented (GNO) electrical steel were taken from different steel batches to investigate the effects of thickness and chemical composition (C, Sn, Mn and Ti) in the hot-rolled material on the final microstructure and magnetic properties (core losses and magnetic permeability) resulting from two different decarburizing annealing cycles. Hot-rolled samples were processed by cold rolling, intermediate annealing, temper-rolling and final decarburization annealing using the same processing parameters. The experimental results show that the minimum core losses and maximum magnetic permeability are obtained with the thinnest steel thickness and the largest grain size. Increasing Sb and Mn contents, and reducing the C and Ti concentrations also improve the magnetic behavior of these steels. It was also found the effect of grain size on the magnetic behavior is more significant than the one of crystallographic texture.

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“…High permeability and low iron loss have been particularly required in recent years in order to achieve higher efficiency and hence energy saving. Therefore it is important to control the final microstructure of these steels in terms of grain size and crystallographic texture [6]. Grain size optimization has attracted much attention and almost approached its limit by controlling chemical compositions and processing variables at each step [7].…”

Section: Introductionsmentioning

confidence: 99%

Influence of Microstructure Evolution on the Coercive Forces in Low Silicon Non-Oriented Steels

et al. 2010

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The magnetic properties and their dependence on the peculiarity of microstructure in low silicon non-oriented electrotechnical steels were studied in the present work. The estimation of dc magnetic properties of electrical steels was carried out by measurements of coercive forces. It was shown that the coercive force change in silicon steels is dependent on change of average grain size, crystallographic texture and homogeneity of microstructure of the materials. It was revealed that the steels possessing columnar or huge grained microstructure had the lowest measured values of coercive forces. The materials with such microstructure are characterized by a domination of (100) 0vw crystallographic orientation.PACS numbers: 75.20. En, 74.25.Ha, 75.50.Bb, 75.50.Gg IntroductionsThe NO electrotechnical steels belong to group of soft magnetic materials. The typical applications of NO steels are electromotors, generators etc. [1][2][3]. Constant attempts to improve the quality of electrical steels have quite naturally stimulated a search for corresponding improvements in the physical interpretation of magnetic losses [4,5]. High permeability and low iron loss have been particularly required in recent years in order to achieve higher efficiency and hence energy saving. Therefore it is important to control the final microstructure of these steels in terms of grain size and crystallographic texture [6]. Grain size optimization has attracted much attention and almost approached its limit by controlling chemical compositions and processing variables at each step [7]. Increasing grain size results in an increased domain size which initially results in a decrease in core loss because there are less domain walls to move. As domain size continues to increase, however, core loss begins to increase because the domain walls must move faster to cover the same distance [8].

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Microstructural aspects of grain growth kinetics in non-oriented electrical steels

Cited by 29 publications

References 15 publications

Magnesium Non-metallic Inclusions in Non-oriented Electrical Steel Sheets

Magnesium Non-metallic Inclusions in Non-oriented Electrical Steel Sheets

Influence of Thickness and Chemical Composition of Hot-Rolled Bands on the Final Microstructure and Magnetic Properties of Non-Oriented Electrical Steel Sheets Subjected to Two Different Decarburizing Atmospheres

Influence of Microstructure Evolution on the Coercive Forces in Low Silicon Non-Oriented Steels

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