Influence of Cu2S precipitates dissolution on ferrite grain growth during heat treatment in the non-oriented electrical steel sheet

Wu, Yuan; Li, Fangjie; Wang, Ting; Zhao, Dewei; Huang, Huijie; Li, Huigai; Zheng, Shiyou

doi:10.1007/s12540-017-6519-x

Cited by 4 publications

(4 citation statements)

References 27 publications

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“…The driving force provided by dislocation density on the grain growth could be negligible in non-oriented electrical steel. A theoretical equation modified by Gladman [44] could be used for calculating the driving force, F d , for grain growth, as shown in Equation (13). The pinning effect of precipitates on grain growth is caused by the reduction in grain boundary areas.…”

Section: Grain Growth Behaviormentioning

confidence: 99%

“…Many research works have been reported on the study of nitride and sulfide precipitates precipitation mechanism in non-oriented electrical steel [5][6][7][9][10][11][12][13][14]. The particle nucleation rate and growth depend on the nucleation driving force, the diffusivity of controlling element M in the matrix, and the interfacial energy associated with the matrix [8,15].…”

Section: Introductionmentioning

confidence: 99%

“…In the CSP process' non-oriented electrical steel, the size of precipitates would grow more in the soaking process, but the precipitation contents are less [5]. Meanwhile, models on the grain growth inhibition by precipitates are presented with the hypotheses that the grain growth will stop by the pinning force of particles [12][13][14]16,17]. Studies show that the relationship between grain sizes would be strongly inhibited by increasing the interfacial area between grains and particles [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Precipitates in Compact Strip Production (CSP) Process Non-Oriented Electrical Steel

Qiao

Guo

et al. 2020

Metals

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Nitrogen and Sulfur in non-oriented electrical steel would form precipitates, which would severely affect its magnetic properties. Precipitates in compact strip production (CSP) process non-oriented electrical steel were investigated using a transmission electron microscope (TEM) and scanning electron microscopy (SEM). The precipitation mechanism and influence on grain growth were analyzed experimentally and theoretically. The results showed that the main particles in steel were AlN, TiN, MnS, Cu2S, and fine oxide inclusions. The spherical or quasi-spherical of MnS and Cu2S were more liable to precipitate along grain boundaries. During the soaking process, the amount of MnS precipitated on the grain boundary was much larger than that of Cu2S. AlN and TiN in cubic shape precipitated inside grains or grain boundaries. Precipitates preferentially nucleated at grain boundaries, and TiN, MnS mainly precipitated during soaking. In the subsequent processes after soaking, AlN and Cu2S would precipitate unceasingly with the decrease in the average size. The distribution density, the volume fraction, and the average size of the precipitates in the annealed sheets were 9.08 × 1013/cm3, 0.06%, and 54.3 nm, respectively. Precipitates with the grain size of 30–500 nm hindered the grain growth, the grains with 100–300 nm played a major role in inhibiting the grain growth, and the grains with the grain size of 70–100 nm took the second place.

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Section: Grain Growth Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Precipitates in Compact Strip Production (CSP) Process Non-Oriented Electrical Steel

Qiao

Guo

et al. 2020

Metals

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“…The researchers in this study turned their focus to Cu sulfides, which mainly exist in the form of compounds, however, related reports do not express a consistent viewpoint about their specific types and precipitation mechanisms [10][11][12]. Taking Cu sulfides as the main inhibitor, the slab temperature of grain-oriented silicon steel still needs to be reheated to above 1250 • C [13]. Recently, niobium carbide/nitride is found to have a number of similar features to common inhibitors, such as the particle size, number and dispersity, and belongs to a kind of stable phase with a slow coarsening rate and low solution temperature, possibly playing a role as the inhibitor in the grain-oriented silicon steel to achieve the goal of slab reheating at a low temperature [14].…”

Section: Introductionmentioning

confidence: 97%

Investigation of Primary Recrystallization and Decarbonization with Different Heating Rates of Intermediate Annealing Using Nb-Containing Grain-Oriented Silicon Steel

Tian¹,

Kuang²,

et al. 2021

Metals

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An Nb-containing grain-oriented silicon steel was produced through double-stage cold rolling in order to investigate the effect of the heating rate during intermediate annealing on primary recrystallization and decarburization behavior. The microstructure and texture were observed and analyzed by an optical microscope and an electron backscatter diffraction system. A transmission electron microscope was used to observe the precipitation behavior of inhibitors. The decarburization effect during intermediate annealing was also calculated and discussed. The results show that primary recrystallization takes place after intermediate annealing. As the heating rate increases, the average grain size decreases gradually. The textures of {411}<148> and {111}<112> were found to be the strongest along the thickness direction in all of the annealed specimens and are mainly surrounded by HEGB and HAGB (> 45°). A large number of inhibitors with the size of 14~20 nm precipitate are distributed evenly in the matrix. The above results indicate that the higher heating rate during intermediate annealing contributes to both an excellent microstructure and magnetic properties. From the calculation, as the heating rate increases, decarbonization tends to proceed in the insulation stage, and the total amount of carbonization declines.

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Novel Process for the Formation of Goss Grains by Concentrated Shear Strain on Surface in Inhibitor-Free Silicon Steel

Park

et al. 2022

Met. Mater. Int.

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Influence of Cu2S precipitates dissolution on ferrite grain growth during heat treatment in the non-oriented electrical steel sheet

Cited by 4 publications

References 27 publications

Precipitates in Compact Strip Production (CSP) Process Non-Oriented Electrical Steel

Precipitates in Compact Strip Production (CSP) Process Non-Oriented Electrical Steel

Investigation of Primary Recrystallization and Decarbonization with Different Heating Rates of Intermediate Annealing Using Nb-Containing Grain-Oriented Silicon Steel

Novel Process for the Formation of Goss Grains by Concentrated Shear Strain on Surface in Inhibitor-Free Silicon Steel

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