Influence of Sulfur Content and Deformation Temperature on Precipitation Behavior of MnS in 3% Si Steel

Takamiya, Toshito; Obara, Takashi; Muraki, Mineo; Komatsubara, Michiro

doi:10.2355/tetsutohagane1955.89.5_518

Cited by 11 publications

(10 citation statements)

References 9 publications

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“…So a large amount of effective AlN can be obtained after hot band annealing. It has been proved that a large amount of MnS can be obtained during hot rolling process before hot band annealing and the MnS will grow instead of dissolving during hot band annealing because of its high dissolution temperature. According to the classical nucleation theory, AlN tends to precipitate on the pre‐existing MnS due to lower free energy for precipitation.…”

Section: Discussionmentioning

confidence: 99%

“…Although many types of grain growth inhibitors such as AlN, MnS, MnSe, Cu 2– x S, and Nb (C, N), have now come into use for developing sharp Goss texture in grain‐oriented silicon steel, MnS, and AlN are still used as the main inhibitors in production of grain‐oriented electrical steels . It is well known that MnS precipitates mainly during hot rolling and the slab is always reheated above 1350 °C before hot rolling to obtain finely distributed precipitates of MnS, which not only consumes a large amount of energy in slab reheating, but also damages the rollers in the bottom of reheating furnace due to the melting of oxide scale on the slab surface and results in necessitating regular cleaning the bottom. Therefore, it is important to decrease the slab reheating temperature, and meanwhile, make the precipitates finely and uniformly distributed.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Acid-Soluble Aluminum Content on Precipitates and Microstructure of Annealed Hot-Rolled Grain-Oriented Silicon Steel

Zhou

Zhu

et al. 2016

steel research int.

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The effect of acid-soluble aluminum (Al s ) content on precipitation behavior of precipitates, microstructures, and textures of annealed hot-rolled grain-oriented silicon steels are investigated. The results show that a large amount of fine AlN and a little amount of MnS-AlN composite can be obtained after hot band annealing. More fine precipitates are formed in specimen containing higher content of Al s . Al s content plays a negligible effect on the Goss texture formation during hot band annealing and similarly weak Goss texture component can be found in subsurface of annealed hot-rolled bands with different Al s content. It is also found that MnS and AlN can have a combined inhibiting impact on the grain growth. AlN plays a more critical role on the inhibition of grain growth during hot band annealing. The more uniform and finer grains in subsurface of annealed hot-rolled band are due to the effective inhibiting effect of finely and uniformly dispersed precipitates in steel with higher Al s content.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Acid-Soluble Aluminum Content on Precipitates and Microstructure of Annealed Hot-Rolled Grain-Oriented Silicon Steel

Zhou

Zhu

et al. 2016

steel research int.

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“…The superposition phenomena of MnS precipitation and dynamic recrystallization under different temperature-time states indicated in Fig. 3 was really observed during hot deformation of electrical steels [8,12]. The preferential dynamic recrystallization appeared at the high temperature stage (I) and low temperature stage (III) while the preferential precipitation of MnS particles appeared in the In principle, dislocation density in the deformed matrix must be reduced drastically as the dynamic recrystallization predominates at stage I or III while the precipitation of MnS particles around dislocation is retarded.…”

Section: Mutual Interaction Between Mns Precipitation and Dynamic Recmentioning

confidence: 94%

“…The mutual appearance and the complicated composite process of the dynamic recrystallization and MnS precipitation during changeable hot deformation processes in real production lines of electrical steels may lead to deviations from the descriptions above. The corresponding analysis, so far, seems very simple [8,12] and still a long way off from a systematic understanding of the mutual effects and the rules above. No better knowledge in the field has been found.…”

Section: Mutual Interaction Between Mns Precipitation and Dynamic Recmentioning

confidence: 98%

“…Systematical knowledge on the kinetics of MnS precipitation has been obtained [7]. It has been shown that the MnS particles precipitate mainly around dislocations and grain boundaries in electrical steels [8,9] and the dynamic curves of MnS precipitation including time-temperature-precipitation (TTP) or continuous cooling precipitation (CCP) can be measured or calculated. These are shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

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Challenges of the study on precipitation behaviors of MnS in oriented electrical steels

Mao

Yang

2008

Front. Mater. Sci. China

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The studies of the thermo-mechanic principles and the kinetic analysis of MnS precipitation behavior in oriented electrical steels conducted in the last dozen years have been summarized. The problems and insufficiency in the fields concerning nucleation theory of MnS precipitation, the relationship between the precipitation and dynamic recrystallization of the matrix as well as the influence of high-energy boundary precipitation on the pinning effect of the boundary migration were discussed. Suggestions were proposed to modify researches concerning the initial position density for MnS nucleation, the mutual interaction between the precipitation and the dynamic recrystallization as well as the kinetic principles of precipitation nucleation on grain boundaries with different boundary energy, which would complete the related theory of MnS precipitation behaviors.

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Influence of Temperature Evolution on Precipitation Behaviour of Second Phase Particles in Grain‐oriented Electrical Steels

Mao

Guo

et al. 2010

steel research int.

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A model concerning dynamic precipitation of second phase particles during hot deformation of conventional grain‐oriented electrical steels is proposed. The model involves the solid solubility of the elements forming MnS, the corresponding nucleation driving force, as well as the evolution of dislocation densities during hot deformation, which supplies sites for heterogeneous nucleation of MnS particles. The model describes the dynamic process in which temperature keeps decreasing and dislocation density keeps increasing. The influences of reheating temperature, initial rolling temperature, finishing temperature and deformation duration on the precipitation behaviour are involved. Calculations have been conducted based on the model, to simulate the precipitation behaviour of MnS particles during hot rolling of grain‐orientated electrical steels under different parameters. The results indicate that hot rolling is very important for dispersive precipitation of MnS particles. The increase of particle density is promoted by proper increase of reheating temperature or proper reduction of initial and finishing rolling temperature, in which the driving force and dislocation density are increased. The simulation results agree basically with the experimental observations in hot strip of a grain oriented electrical steel.

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Influence of Sulfur Content and Deformation Temperature on Precipitation Behavior of MnS in 3% Si Steel

Cited by 11 publications

References 9 publications

Effect of Acid-Soluble Aluminum Content on Precipitates and Microstructure of Annealed Hot-Rolled Grain-Oriented Silicon Steel

Effect of Acid-Soluble Aluminum Content on Precipitates and Microstructure of Annealed Hot-Rolled Grain-Oriented Silicon Steel

Challenges of the study on precipitation behaviors of MnS in oriented electrical steels

Influence of Temperature Evolution on Precipitation Behaviour of Second Phase Particles in Grain‐oriented Electrical Steels

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