Influence of different kinds of rolling on the crystallographic texture and magnetic induction of a NOG 3 wt% Si steel

Silva, J.M.; Júnior, Eustáquio de Souza Baêta; Moraes, Nicki Robbers Darciano Cajueiro de; Botelho, Ramón Alves; Félix, Roberto; Brandão, Luiz Paulo Mendonça

doi:10.1016/j.jmmm.2016.08.005

Cited by 3 publications

(5 citation statements)

References 17 publications

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“…Currently, although the fundamental theory regarding the formation of shear bands is still under debate, it can be generally accepted that shear band is caused by shear deformation on specific shear systems, whether it is crystallographic [ 32 ] or non-crystallographic [ 35 ]. In this context, ASR can produce more shear bands compared with SR [ 29 , 30 ]. At the same time, it has been confirmed that the difference in etching degree is related to the stored energy of the deformation bands after cold rolling [ 15 ].…”

Section: Discussionmentioning

confidence: 99%

“…With respect to the magnetic properties, silicon (Si) steel provides one example where the ASR can simultaneously increase the magnetic induction and decrease the iron loss with a maximum amplitude of 0.011 T and 0.50 W/kg [21]. Silva et al [30] also found that the ASR Si steel exhibits significantly enhanced magnetic properties compared with the SR one under the same recrystallization condition. However, fewer studies have been conducted on the effect of shear bands on the microstructure and texture evolution of non-oriented silicon steel.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Shear Bands Induced by Asymmetric Rolling on Microstructure and Texture Evolution of Non-Oriented 3.3% Si Steel

Fang

Guo

et al. 2020

Materials

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In the present work, the microstructure and texture of non-oriented 3.3% Si steel processed by asymmetric rolling (ASR) and subsequent annealing at different temperatures were compared with those obtained when using traditional symmetric rolling (SR). This work aims to reveal the effect of shear bands introduced by the ASR on the microstructure and texture evolution. The ASR sample reaches a recrystallization fraction of 62% at an annealing temperature of 650 °C, which is 32% higher than that of the SR sample annealed at the same temperature. This can be attributed to the abundant shear bands introduced by the ASR, which serve as the heterogeneous nucleation sites for the recrystallized grains. When increasing the annealing temperature to 750 °C, complete recrystallization could be observed in both asymmetric- and symmetric-rolled samples. When using an annealing temperature of 650 °C, the γ-oriented grains were dominant in the surface layer, while strong Goss-oriented grains could be observed in the center in the ASR sample. This is due to the fragmented small subgrains with different orientations in the surface layer inhibiting the nucleation of Goss- and cube-oriented grains during the annealing. In contrast, numerous Goss- and cube-oriented grains were formed in the surface layer after complete recrystallization when the ASR sample was annealed at a temperature of 750 °C. This may be related to the higher thermal energy, which benefits the nucleation of the Goss- and cube-oriented grains. In addition, ASR significantly increased the strength of η-fiber after complete recrystallization when compared with SR. This work might be helpful to design the rolling and the subsequent annealing processes.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Shear Bands Induced by Asymmetric Rolling on Microstructure and Texture Evolution of Non-Oriented 3.3% Si Steel

Fang

Guo

et al. 2020

Materials

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“…The magnetic properties of Fe-Si steels strictly depend on textural evolution [64][65][66][67][68][69][70], and consequently on the starting microstructure [71][72][73], annealing conditions [74], and cold-rolling settings [75][76][77][78][79][80]. Core losses and eddy current losses are strongly dependent on recrystallization and grain size morphology after cold rolling.…”

Section: Effect Of Ufh On the Textural Evolution And Magnetic Propert...mentioning

confidence: 99%

“…Grain size and the absence of impurities such as dislocations, grain boundaries, or precipitates are the most important factors determining power losses. The most relevant textural components in electrical steels are the Goss component (110) [001], the rotated Cube component (100) [011], and the γ-fiber [111]//ND [78][79][80][81][82]. After cold rolling, the texture is characterized by very strong Goss and cube component orientations that, in principle, are very positive in terms of magnetic features; in fact, the matrix is highly deformed.…”

Section: Effect Of Ufh On the Textural Evolution And Magnetic Propert...mentioning

confidence: 99%

Ultrafast Heating Heat Treatment Effect on the Microstructure and Properties of Steels

Gaggiotti

Albini

Nunzio

et al. 2022

Metals

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The adoption of the ultrafast heating (UFH) process has gained much attention in the last few years, as the green energy and minimization of CO2 emissions are the main aspects of contemporary metal science and thermal treatment. The effect of ultrafast heating (UFH) treatment on carbon steels, non-oriented grain (NGO) electrical steels, and ferriticor austenitic stainless steels is reported in this review. The study highlights the effect of ultrarapid annealing on microstructure and textural evolution in relation to microstructural constituents, recrystallization temperatures, and its effect on mechanical properties. A strong influence of the UFH process was reported on grain size, promoting a refinement in terms of both prior austenite and ferrite grain size. Such an effect is more evident in medium–low carbon and NGO steels than that in ferritic/austenitic stainless steels. A comparison between conventional and ultrafast annealing on stainless steels shows a slight effect on the microstructure. On the other hand, an evident increase in uniform elongation was reported due to UFH. Textural evolution analysis shows the effect of UFH on the occurrence of the Goss component (which promotes magnetic properties), and the opposite with the recrystallization g-fiber. The recovery step during annealing plays an important role in determining textural features; the areas of higher energy content are the most suitable for the nucleation of the Goss component. As expected, the slow annealing process promoted equiaxed grains, whereas rapid heating promoted microstructures with elongated grains as a result of the cold deformation.

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“…Therefore, cold rolling parameters, such as reduction degree and number of rolling passes, have a significant influence on the final texture and grain size. As conventional cold rolling typically conserves and even enhances the αand γ-fiber [2], the potential to control texture via a different stress distribution or temperature range in non-conventional rolling strategies like cross rolling [22,23], reverse rolling [24,25], warm rolling [19,26], and asymmetric rolling [18,27] has been studied. For example, Zhang et al [26] investigated warm rolling (initial temperature of 300 • C) for a Fe-2.5 wt.-% Si-0.52 wt.-% Al NO electrical steel and concluded that warm rolling increases the nucleation of favorable η-fiber (<001>//RD) nuclei and results in an overall stronger η-fiber and weaker γ-fiber at moderate strain.…”

Section: Introductionmentioning

confidence: 99%

Influence of Process Parameters on Grain Size and Texture Evolution of Fe-3.2 wt.-% Si Non-Oriented Electrical Steels

et al. 2021

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The magnetic properties of non-oriented electrical steel, widely used in electric machines, are closely related to the grain size and texture of the material. How to control the evolution of grain size and texture through processing in order to improve the magnetic properties is the research focus of this article. Therefore, the complete process chain of a non-oriented electrical steel with 3.2 wt.-% Si was studied with regard to hot rolling, cold rolling, and final annealing on laboratory scale. Through a comprehensive analysis of the process chain, the influence of important process parameters on the grain size and texture evolution as well as the magnetic properties was determined. It was found that furnace cooling after the last hot rolling pass led to a fully recrystallized grain structure with the favorable ND-rotated-cube component, and a large portion of this component was retained in the thin strip after cold rolling, resulting in a texture with a low γ-fiber and a high ND-cube component after final annealing at moderate to high temperatures. These promising results on a laboratory scale can be regarded as an effective way to control the processing on an industrial scale, to finally tailor the magnetic properties of non-oriented electrical steel according to their final application.

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Influence of different kinds of rolling on the crystallographic texture and magnetic induction of a NOG 3 wt% Si steel

Cited by 3 publications

References 17 publications

Effect of Shear Bands Induced by Asymmetric Rolling on Microstructure and Texture Evolution of Non-Oriented 3.3% Si Steel

Effect of Shear Bands Induced by Asymmetric Rolling on Microstructure and Texture Evolution of Non-Oriented 3.3% Si Steel

Ultrafast Heating Heat Treatment Effect on the Microstructure and Properties of Steels

Influence of Process Parameters on Grain Size and Texture Evolution of Fe-3.2 wt.-% Si Non-Oriented Electrical Steels

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