Deformation Structure and Recrystallization of Ferritic FeSi Steels

Schneider, J.; Franke, Armin; Stöcker, Anett; Kawalla, Rudolf

doi:10.1002/srin.201500447

Cited by 9 publications

(5 citation statements)

References 17 publications

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“…Metallographic studies as well as the figures for the image quality plus the rotation angle map, see Figure in ref., indicate that both hot band samples exhibit a complex microstructure and not a well‐defined grain structure across the thickness.…”

Section: Resultsmentioning

confidence: 98%

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Evolution of Optimum Grain Size for Low Loss Ferritic FeSi Steels

Schneider

Stöcker

Kawalla

et al. 2017

steel research int.

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The magnetic properties of non-oriented Fe-Si electrical steels are characterized by their magnetization behavior and specific magnetic losses. The magnetic losses are the most important property for selection of material grades at a given application. The magnetic properties are determined generally by the texture and microstructure. There is a strong link between the specific magnetic losses of the fully processed electrical steel and the grain size. Large values of grain size are necessary to reach low values of the specific magnetic losses. This is in contrast to conventional steels with high strength, where low values of grain size are preferable. To fulfill the requirements on large grain size for low loss materials grain growth plays an important role. In this paper, the authors will analyze by optical microscopy and EBSD investigations the influences of different microstructure of the hot strip and the resulting microstructure after cold rolling on recrystallization and grain growth after final annealing of Fe-2.4 wt% Si. The image quality plus rotation angle map and the misorientation angle frequency are used to access the degree of microstructural changes during processing. It will be demonstrated that the microstructure of the used hot band effects remarkable the onset of grain growth.

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Section: Resultsmentioning

confidence: 98%

“…For the regarded two hot bands, see also refs., quite different microstructures were obtained after cold rolling. Figure shows the quite different character of the microstructure for samples 1 and 2.…”

Section: Resultsmentioning

confidence: 98%

Evolution of Optimum Grain Size for Low Loss Ferritic FeSi Steels

Schneider

Stöcker

Kawalla

et al. 2017

steel research int.

Self Cite

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show abstract

“…Any modelling of the resulting texture after cold rolling and finally of the recrystallization texture after annealing these cold rolled material has to take into account also a shear stress contribution to the stored deformation energy beside a uniform in-plane strain at cold rolling. The resulting deformation substructures after cold rolling will affect the kinetic of the ongoing processes at final annealing: recovery, recrystallization [11,15,25]. A deeper understanding of the interrelations between the microstructure of the hot strip and the deformation energy of the cold rolled material may be a basic for further improvements of the technology and of the final obtained properties.…”

Section: Deformation Structure After Cold Rollingmentioning

confidence: 99%

Effects of Hot Strip Microstructure on the Deformation Microstructure and Textures after Cold Rolling in Ferritic Nonoriented Electrical Steels

Franke¹,

Schneider²,

Bacroix³

et al. 2018

J. Mater. Sci. Technol. Res.

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The magnetic properties of electrical steels are related to the microstructure and texture of the final processed steel. There is an interplay and interaction of the microstructure and texture between the various processing steps. The ongoing structural changes at final annealing of the cold rolled material depend sensitively on the deformation structure after the cold rolling with high deformation. In this paper, we will study in detail the role of the microstructure of the hot strip on the deformation structure after cold rolling with high deformation.

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“…Depending on the microstructure of the hot band a rather complex deformation structure appears for ferritic FeSi steels after the heavy cold rolling to reach the desired final thickness [4,5]. This complex microstructure affects the ongoing recrystallization and evolution of microstructure and texture at final annealing [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effects by Different Microstructure and Texture of Hot Band on the Evolution of Microstructure and Texture after Cold Rolling and Final Annealing of Ferritic FeSi Steels

Franke¹,

Schneider²,

Bacroix

et al. 2019

J. Mater. Sci. Technol. Res.

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It is well established that there is an interplay and interaction between the processing steps at fabrication of non-oriented electrical steels: hot rolling, cold rolling and annealing with respect to the evolution of the microstructure and texture. In this paper we will analyse in detail by optical microscopy and EBSD-measurements the influence of the microstructure of hot band prepared in different ways on the deformation structure after cold rolling and finally the evolution of microstructure as well as texture at final annealing due to recrystallization followed by grain growth. It will be demonstrated that the microstructure of the hot band effects the start of the recrystallization and finally the start of the grain growth at final annealing. The evolution of the microstructure at the stage of recrystallization is rather inhomogeneous across the thickness. This results from the complex deformation substructures after cold rolling. It will be pointed out that an explanation of the texture evolution at recrystallization only by in-plane compression stress fails. The inclusion of shear stress may explain the observed figure for the texture. The grain growth, which is necessary for the non-oriented electrical steels to reach the desired low values of specific magnetic losses, is finally the dominant process at the relevant higher annealing temperatures. The evolution of texture at recrystallization is different from those at grain growth.

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Deformation Structure and Recrystallization of Ferritic FeSi Steels

Cited by 9 publications

References 17 publications

Evolution of Optimum Grain Size for Low Loss Ferritic FeSi Steels

Evolution of Optimum Grain Size for Low Loss Ferritic FeSi Steels

Effects of Hot Strip Microstructure on the Deformation Microstructure and Textures after Cold Rolling in Ferritic Nonoriented Electrical Steels

Effects by Different Microstructure and Texture of Hot Band on the Evolution of Microstructure and Texture after Cold Rolling and Final Annealing of Ferritic FeSi Steels

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