Effect of copper precipitates on mechanical and magnetic properties of Cu-bearing non-oriented electrical steel processed by twin-roll strip casting

Wang, Yuqian; Zhang, Xiaoming; He, Zhen; Zu, Guoqing; Ji, Guang-Fa; Duan, Jun-Yang; Misra, R.D.K.

doi:10.1016/j.msea.2017.07.075

Cited by 35 publications

(14 citation statements)

References 37 publications

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“…Combining Equations ( 5) and ( 6) allows us to obtain Equation (7), as follows: Based on Equation ( 7), combined with the MSD results at different temperatures, calculated by the above two molecular dynamics models, the diffusion coefficients at different temperatures were linearly fitted, and the results are shown in Figure 13.…”

Section: Analysis Of Cu/fe Diffusion Behavior With the MD Methodsmentioning

confidence: 99%

“…The reason is mainly that the Cu is the corrosion-resistant element, and it is easy to segregate at the grain boundaries and the defects of the steel, thereby effectively playing a role in preventing the corrosion of the grain boundaries and the defects [4][5][6]. As the Cu content in steel increases, the corrosion resistance of steel would increase too, but it also brings a huge challenge to continuous casting for Cu-containing steel [7,8]. Because the Cu-Fe binary system is a typical mutual insoluble system [9], when the temperature is below 600 • C, the solubility of Cu in Fe is close to zero.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Diffusion Behavior of Cu in Low-Carbon Steel under High Temperatures

et al. 2022

Crystals

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The effective diffusion of Cu in Fe is the key to forming a stable transition layer between copper and low-carbon steel, but it is seriously affected by several factors, especially temperature, and the diffusion of Cu can only be completed at high temperatures. In order to analyze the diffusion coefficient of Cu in low-carbon steel under high temperatures, and to obtain the best diffusion temperature range of Cu in steel, the electrodeposition method was used to prepare the diffusion couple of copper and low-carbon steel, which would be annealed under different temperatures for 6 h; meanwhile, the MD models were also used to analyze the diffusion behavior of Cu in Fe at different temperatures. The results show that the diffusion of Cu in low-carbon steel could be realized by high-temperature annealing, and as the temperature increases, the thickness of the Cu/low-carbon steel transition layer shows an increasing trend. When the annealing temperature is between 900 °C and 1000 °C, the thickness of the transition layer increases the fastest. The results of the MD models show that, when the temperature is in the phase transition zone, the main restrictive link for the diffusion of Cu in Fe is the phase transition process of Fe; additionally, when the temperature is higher, the main restrictive link for the diffusion of Cu in Fe is the activity of the atom.

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Section: Analysis Of Cu/fe Diffusion Behavior With the MD Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on the Diffusion Behavior of Cu in Low-Carbon Steel under High Temperatures

et al. 2022

Crystals

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“…Common manufacturing processes for copper-steel composite materials include composite rolling, electrodeposition, explosive forming, diffusion welding, powder metallurgy, hot-dip plating, and casting compound [8][9][10][11][12][13][14][15][16][17][18][19][20]. Compared with other processes, the casting compound of copper-steel could form a more stable Cu/Fe transition layer, which would determine the subsequent processing performance of the composite material.…”

Section: Introductionmentioning

confidence: 99%

Study on the Bonding Mechanism of Copper-Low Carbon Steel for Casting Compounding Process

Zhang

et al. 2021

Metals

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The casting compounding process for copper-steel composite material has broad prospects of application, but due to the lack of supporting theories (especially the bonding mechanism of copper-steel at high temperatures), it is developing slowly. In this research, copper-steel composite materials for different casting temperatures have been prepared by the casting compound process. The results show that, for the casting compound process, the stable copper-steel transition layer can be formed in a short time, and the bonding of copper and low carbon steel is the result of both the diffusion of Cu in low carbon steel and the dissolution of Fe in molten copper. The diffusion coefficient of Cu in the low carbon steel is mainly concentrated in the range of 4.0 × 10−15–8.0 × 10−14 m2/s. However, for casting compound process of copper-steel, as the temperature rises the thickness of the copper-steel transition layer gradually decreases, while the Fe content in the copper layer gradually increases. At the same time, the analysis of the glow discharge results shows that, during the solid-liquid composite process of copper-steel, the element C in steel has a great influence. As the temperature rises, the segregation of C intensifies seriously; the peak of the C content moves toward the copper side and its value is gradually increases. The segregation of C would reduce the melting point of the steel and cause irregular fluctuations of the diffusion of Cu in low carbon steel. Therefore, a relatively lower molten copper temperature is more conducive to the preparation of copper-steel composite materials.

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“…The relevant deterioration of magnetic properties is at tolerable levels, but it generally requires additional alloying elements, which not only increases production costs but also brings some difficulties in the rolling and stamping process. Introducing Cu into non-oriented silicon steel for precipitation strengthening to improve mechanical properties is a potential method for non-oriented silicon steel [18][19][20][21]. Due to the low solubility of Cu in ferrite and low lattice misfit between Cu precipitates and bcc matrix, the high densities of nano-size Cu precipitates form after thermal-aging processes and significantly enhance mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, Bian [19] and Wu [20] reported that Cu-rich precipitates could improve recrystallization texture by inhibiting γ texture and promoting Goss texture ({110} <100>), resulting in the decrease in core loss without deteriorating magnetic induction. Moreover, it is suggested that Cu precipitates significantly contributed to the yield strength of a 0.35 mm thick non-oriented silicon steel without deteriorating the magnetic properties in the strip casting process [21]. However, studies on Cu precipitates in thin-gauge nonoriented silicon steel are limited.…”

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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Effect of copper precipitates on mechanical and magnetic properties of Cu-bearing non-oriented electrical steel processed by twin-roll strip casting

Cited by 35 publications

References 37 publications

Research on the Diffusion Behavior of Cu in Low-Carbon Steel under High Temperatures

Research on the Diffusion Behavior of Cu in Low-Carbon Steel under High Temperatures

Study on the Bonding Mechanism of Copper-Low Carbon Steel for Casting Compounding Process

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

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