High-permeability and thin-gauge non-oriented electrical steel through twin-roll strip casting

Jiao, Haitao; Xu, Yujie; Zhang, Yuanxiang; Cao, Guangming; Li, Chenggang; Niu, Jian; Misra, R.D.K.

doi:10.1016/j.matdes.2017.09.051

Cited by 33 publications

(6 citation statements)

References 33 publications

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“…It is known that the recrystallization texture and annealing microstructure has great effect on the magnetic properties of non-oriented silicon steels. In bcc iron, <001> crystal direction is the easiest magnetization direction because of the lowest magnetocrystalline anisotropy energy, and <111> is the hardest magnetization direction [ 11 , 12 ]. Thus, <001>//RD (η-fiber) and <001>//ND (λ-fiber) textures are considered to be favorable for magnetic properties, while the <111>//ND (γ-fiber) texture is harmful.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, <001>//RD (η-fiber) and <001>//ND (λ-fiber) textures are considered to be favorable for magnetic properties, while the <111>//ND (γ-fiber) texture is harmful. In addition, the total core loss of non-oriented silicon steel consists of hysteresis loss, classical eddy current loss, and anomalous loss, while hysteresis loss dominates at low frequencies [ 11 , 32 ]. Usually, hysteresis loss decreases with an increase in the grain size of the annealed sheets, because of a decrease in area of the domain walls.…”

Section: Resultsmentioning

confidence: 99%

“…Extensive research on optimizing the processing parameters, such as hot rolling temperature and cold rolling direction and annealing rate, has been carried out to obtain favorable cube and Goss textures, and to improve magnetic properties [ 7 , 8 , 9 ]. In recent years, twin-roll strip casting technology is considered as a promising alternative for the fabrication of silicon steels with high magnetic induction [ 10 , 11 , 12 ]. Strip casting significantly simplifies the process by directly supplying the thin strip from molten steel, and also gives rise to different microstructures and texture evolution compared with conventional processes.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Cold Rolling Process on Microstructure, Texture and Properties of Strip Cast Fe-2.6%Si Steel

Jiao

Qiu

et al. 2018

Materials

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The use of twin-roll strip casting for the preparation of non-oriented silicon steel has attracted widespread attention in recent years, but related reports are limited. In this study, both one- and two-stage cold rolling with three intermediate annealing temperatures were employed to produce strip cast non-oriented silicon steel. The evolution of the microstructure and texture through the processing routes and its effect on magnetic properties were studied. Compared with one-stage rolling, two-stage rolling increased the in-grain shear bands and the retention of Cube texture in the cold rolled sheets, thereby promoting the nucleation of favorable Goss and Cube grains and restraining the nucleation of harmful {111}<112> grains. With the increase in intermediate annealing temperature, the η-fiber texture in annealed sheets was gradually enhanced, and the average grain size was increased, leading to significant improvement of magnetic properties.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Cold Rolling Process on Microstructure, Texture and Properties of Strip Cast Fe-2.6%Si Steel

Jiao

Qiu

et al. 2018

Materials

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“…The laminated cores made of non-oriented (NO) electrical steels are the prime materials employed in transformers and electric rotating machines. As the magnetic loss covers about 5-10% of the generated electric power [1], there has been an increasing interest in the development of advanced preparation process to reduce the core loss by the optimization of purification [2], rolling [3], additive manufacturing [4], and grain texture recrystallization [5,6]. An inevitable step to fabricate the steel parts of proper geometry is their cutting which, however, induces specific deformation textures and stress patterns [7], in particular close to the cutting edge.…”

Section: Introductionmentioning

confidence: 99%

Correlation between Cutting Clearance, Deformation Texture, and Magnetic Loss Prediction in Non-Oriented Electrical Steels

et al. 2021

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Manufacturing the magnetic cores in electrical machines impacts the magnetic performance of the electrical steel by inducing stresses near the cutting edge. In this paper, energy loss behaviour in non-oriented electrical steels punched with different cutting clearances before and after annealing is investigated. An experimental shear cutting tool was employed to punch the ring-shaped parts from electrical steels in a finished state with four different values of cutting clearance corresponding to 1%, 3%, 5%, and 7% of the sheet thickness. The effect of cutting clearance on the magnetic losses is derived and analysed by the statistical theory of losses and associated loss separation concept including the analysis of movable magnetic objects. In this framework, this paper assesses the combined effect of cutting clearance, frequency, and heat treatment on the hysteresis loops and iron losses in non-oriented FeSi electrical steels. Measurements have been performed from quasi-static to 400 Hz at peak induction Bp = 1.0 T. Both states before and after heat treatment have been considered. The excess loss is observed as the most sensitive loss component to cutting clearance and its magneto–structural correlation is quantified.

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“…It has been recognized that the initial favorable {100} columnar structure in as-cast strips exhibited strong heredity to increase the intensity of favorable {100} texture and reduces the intensity of harmful γ texture (<111>//normal direction) in the final sheet, which could significantly improve the magnetic properties of non-oriented silicon steel [10]. Moreover, the characteristics of the near-net shape of strip casting is beneficial for processing ultra-thin non-oriented silicon steel [11,12].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Characteristics and Strengthening Behavior of Cu-Bearing Non-Oriented Silicon Steel: Conventional Process versus Strip Casting

Fang

Hou

Wang

et al. 2021

Metals

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Based on conventional hot rolling processes and strip casting processes, Cu precipitation strengthening is used to improve the strength of non-oriented silicon steel in order to meet the requirements of high-speed driving motors of electric vehicles. Microstructure evolution was studied, and the effects of Cu precipitates on magnetic and mechanical properties are discussed. Compared with conventional processes, non-oriented silicon steel prepared by strip casting exhibited advantages with regard to microstructure optimization with coarse grain and {100} texture. Two-stage rolling processes were more beneficial for uniform microstructure, coarse grains and improved texture. The high magnetic induction B50 of 1.762 T and low core losses with P1.5/50, P1.0/400 and P1.0/1000 of 1.93, 11.63 and 44.87 W/kg, respectively, were obtained in 0.20 mm sheets in strip casting. Cu precipitates significantly improved yield strength over ~120 MPa without deteriorating magnetic properties both in conventional process and strip casting. In the peak stage aged at 550 °C for 120 min, Cu precipitates retained bcc structure and were coherent with the matrix, and the yield strength of the 0.20 mm sheet was as high as 501 MPa in strip casting. The main mechanism of precipitation strengthening was attributed to coherency strengthening and modulus strengthening. The results indicated that balanced magnetic and mechanical properties can be achieved in thin-gauge non-oriented silicon steel with Cu addition in strip casting.

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High-permeability and thin-gauge non-oriented electrical steel through twin-roll strip casting

Cited by 33 publications

References 33 publications

Effect of Cold Rolling Process on Microstructure, Texture and Properties of Strip Cast Fe-2.6%Si Steel

Effect of Cold Rolling Process on Microstructure, Texture and Properties of Strip Cast Fe-2.6%Si Steel

Correlation between Cutting Clearance, Deformation Texture, and Magnetic Loss Prediction in Non-Oriented Electrical Steels

Microstructure Characteristics and Strengthening Behavior of Cu-Bearing Non-Oriented Silicon Steel: Conventional Process versus Strip Casting

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