An investigation into the cause of inhomogeneous distributions of aluminium nitrides in silicon steels

Zaveryukha, A. A.; Davis, Claire

doi:10.1016/s0921-5093(02)00203-4

Cited by 6 publications

(4 citation statements)

References 2 publications

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“…Morphology and crystallography of the oxides were surveyed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) 2,17) There have seldom been reports on the investigation of decarburized electrical steel sheets using TEM, even though TEM has been employed to study the microstructure and the crystallography in field of steel including the high content of silicon. [18][19][20] It is important to investigate microstructure, morphology, and distribution of the oxides in the subscale for understanding behavior of high temperature oxidation during the decarburization annealing of the electrical steel. 2,4,8) In this study, the oxide layers formed during the decarburization annealing were investigated by TEM.…”

Section: Introductionmentioning

confidence: 99%

A TEM Study of Oxide Layers Formed during Decarburization Annealing of Electrical Steel

et al. 2011

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It is very important to know the morphology and chemical properties of subscales of oxide layers on surface for controlling and understanding high temperature oxidation in electrical steel. In present work, the oxide layers were investigated by various methods of transmission electron microscopy (TEM) such as scanning transmission electron microscopy (STEM), nanobeam electron diffraction (NBD), energy dispersive X-ray spectrometry (EDS), and electron energy loss spectrometry (EELS). The high-angle annular dark field (HAADF) of STEM could be a useful analysis technique to study the morphology of the oxide layers. The main oxides formed in the subscales during the decarburization annealing were fayalite, iron oxides, and silica, which were identified by EDS, NBD and EELS. The crystalline fayalites were found both in the surface region within several tens nanometers and in the region within a micrometer surrounding silica, and the atomic configuration in the unit cell of the fayalite was presented. Amorphous silica was formed both in the upper region of the subscales with a spherical shape and in the interface between the spherical silica and the iron matrix with a lamellar shape. TEM could be useful technique to characterize morphologies, microstructures and elemental compositions of oxides, and to understand the oxidation mechanism for the manufacture of the high quality electrical steel.

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Section: Introductionmentioning

confidence: 99%

A TEM Study of Oxide Layers Formed during Decarburization Annealing of Electrical Steel

et al. 2011

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“…The content of impurity elements was controlled within the chemical analysis standard. And minor compositional variation resulted in a small difference in the rate of recovery, recrystallisation and grain growth but no difference in the distribution of the nitride precipitates [18] . When the superheat degree was 20 • C, the melt was poured.…”

Section: Methodsmentioning

confidence: 99%

AlN precipitates and microstructure in non-oriented electrical steels produced by twin-roll casting process

Zhang

et al. 2013

ACTA METALL SIN

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Aluminum nitride (AlN) precipitates and microstructure of 4 wt.% (Si+Al) non-oriented electrical steel were investigated. The 2.0 mm thick cast strips with three different silicon/aluminum (Si/Al) ratios were produced by twin-roll casting process, then the strips were reheated, warm rolled, cold rolled and annealed. The microstructure and AlN precipitates were characterized using optical microscopy, scanning electron microscopy and transmission electron microscopy. The results showed that with the increase of Si/Al ratio, on the one hand, the casting microstructure changed from columnar grains to equiaxed grains, and the uniformity of annealed microstructure was improved; On the other hand, the number of AlN precipitates in cast strips reduced meanwhile the distribution became dispersed. By the reheat treatment, the size and distribution of the AlN precipitates can be changed. Moreover, the grain size of the annealed strips is in the range of 20-50 µm, at the same time, many AlN precipitates were located at grain boundaries. Therefore, controlling the Si/Al ratio is a simple method to obtain desired microstructure. Then AlN precipitates in non-oriented electrical steel prepared by twin-roll casting process hinder markedly the recrystallized grains growth. A compatible reheat treatment can be an approach worth exploring to control the behavior of AlN precipitates.

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“…In real conditions, creating a more precise texture and reducing the thickness of the final sheet leads to an increase in the magnetic domain size which also has an impact on core losses. The reduction in iron loss is one of the most important industrial issues and until now, lower iron loss materials have been developed, in particular through improvements in the texture, production of thinner sheets and refinements of the magnetic domain wall spacing in order to reduce the domain wall velocity and consequently reduce edgy current losses (as the size of magnetic domains decreases, the number of domain walls increases and their velocity also decreases) [21,22].…”

Section: Introductionmentioning

confidence: 99%

Texture Intensity in Grain-Oriented Steel in the Main Stages of the Production Cycle

Krawczyk,

Ścibisz,

Goły

et al. 2024

Crystals

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Grain-oriented electrical steel (GOES) has been used for many years for application in transformed cores due to its excellent magnetic properties. Magnetic properties are strongly influenced by obtaining a texture with a certain orientation (110) [001] for BCC structure. This is related to the easy direction of magnetization [001]. So far, the main research has been focused on obtaining a strong texture in the last stages of the process. The aim of the present study was to additionally trace textural changes for a slab after the continuous casting (CC) process and for a sheet after the hot rolling process. The scope of such an analysis has not been conducted before. With regard to the state after continuous casting (CC), the texture was related to measurements of the anisotropy of Barkhausen magnetic noises and the macrostructure of the slab. Based on the X-ray diffraction examinations that compared the texture intensity calculated from the texture coefficient of the slab, the hot rolled steel and the final product of grain-oriented electrical steel contained 3.1% of Si. The studies performed with the material taken from three different production steps showed high differences in the values of textural intensity indicating the occurrence of a crystallization texture, especially in the area of the columnar crystal zone; textural weakness after the hot rolling process and high texturing in the final product for textural components corresponding to the desired Goss texture.

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An investigation into the cause of inhomogeneous distributions of aluminium nitrides in silicon steels

Cited by 6 publications

References 2 publications

A TEM Study of Oxide Layers Formed during Decarburization Annealing of Electrical Steel

A TEM Study of Oxide Layers Formed during Decarburization Annealing of Electrical Steel

AlN precipitates and microstructure in non-oriented electrical steels produced by twin-roll casting process

Texture Intensity in Grain-Oriented Steel in the Main Stages of the Production Cycle

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