Effect of nitriding on grain oriented silicon steel bearing aluminum (the second study)

Kumano, Tomoji; Ohata, Yoshifumi; Fujii, Norikazu; Ushigami, Y.; Takeshita, Tetsuro

doi:10.1016/j.jmmm.2006.02.188

Cited by 28 publications

(15 citation statements)

References 12 publications

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“…Low-temperature slab-reheating techniques Through many years of efforts, several low-heating methods have been developed all over the world [61][62][63][64][65][66][67]. Since AlN has lower dissolution and precipitation temperatures than MnS, AlN is employed as the inhibitor instead of MnS or MnS+AlN.…”

Section: Article In Pressmentioning

confidence: 99%

Developments in the production of grain-oriented electrical steel

Xia

Kang

Wang

2008

Journal of Magnetism and Magnetic Materials

158

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Section: Article In Pressmentioning

confidence: 99%

Developments in the production of grain-oriented electrical steel

Xia

Kang

Wang

2008

Journal of Magnetism and Magnetic Materials

158

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“…When NH 3 comes into contact with the heated steel sheet, it disassociates into N and H. The active N atoms then diffuse into the steel sheet creating a nitride layer, and N will combine with Al to form AlN inhibitors at higher temperatures. Previous studies propose that there is an optimum volume fraction of the precipitates for the development of complete secondary recrystallization in 3% silicon steel, and the optimum nitrogen content after nitriding is between 0.013% and 0.024% [14,15]. In this experiment, the nitrogen contents after nitriding for 30, 60, and 90 s are about 100, 160, and 230 ppm, respectively.…”

Section: Inhibitor Precipitationmentioning

confidence: 71%

“…In this study, grain-oriented 6.5 wt% silicon steel sheets were produced by rolling processes. To reduce the slab reheating temperature and avoid the effect of warm rolling on the precipitation of the inhibitors, an acquired inhibitor method was used to form nitride as main inhibitor by nitriding [14,15]. It was different to the conventional process of grain-oriented silicon steel, where the combination of warm rolling and cold rolling instead of one-stage cold rolling with a large reduction could reduce cracking in high-silicon steel.…”

Section: Introductionmentioning

confidence: 99%

Secondary Recrystallization Behaviors of Grain-Oriented 6.5 wt% Silicon Steel Sheets Produced by Rolling and Nitriding Processes

Qin

Yang

Mao

et al. 2016

Acta Metall. Sin. (Engl. Lett.)

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By rolling and nitriding processes, 0.23-to 0.3-mm-thick grain-oriented 6.5 wt% silicon steel sheets were produced. The core losses of grain-oriented 6.5 wt% silicon steel at frequencies ranging from 400 Hz to 20 kHz were lower than that of the grain-oriented 3 wt% silicon steel with the same thickness by 16.6-35.8%. The secondary recrystallization behavior was investigated by scanning electron microscopy, energy-dispersive spectroscopy, and electron backscattered diffraction. The results show that the secondary recrystallization in high-silicon steel sheets develops more completely as the nitrogen content increases after nitriding, secondary recrystallized grain sizes become larger, and the sharpness of Goss texture increases. Because more 110 f g 116 h i grains in the subsurface and the central layer of the sheets have a lot of 20°-45°high-energy boundaries in addition to Goss grains, 110 f g 116 h i can be the main component through selective growth during secondary recrystallization when the inhibitor quantity is not enough and inhibitor intensity is weaker. The increases in nitrogen content can increase the inhibitor intensity and hinder abnormal growth of a mount of 110 f g 116 h i grains and therefore enhance the sharpness of Goss texture.

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“…Two different ways: hot band annealing before cold rolling and nitriding during primary recrystallization annealing, were developed to produce the finely distributed precipitates of AlN. Although, nitriding is now widely used for getting more and finer AlN, hot band annealing is also necessary for producing grain‐oriented silicon steel with lower slab heating temperature . It has been proved that not only the precipitation behavior of AlN which precipitates primarily during the phase transformation of γ → α in hot band rolling, but also the microstructure of annealed hot‐rolled band can be promoted by controlling hot band annealing conditions, such as cooling way and cooling rate during hot band annealing .…”

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 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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Effect of nitriding on grain oriented silicon steel bearing aluminum (the second study)

Cited by 28 publications

References 12 publications

Developments in the production of grain-oriented electrical steel

Developments in the production of grain-oriented electrical steel

Secondary Recrystallization Behaviors of Grain-Oriented 6.5 wt% Silicon Steel Sheets Produced by Rolling and Nitriding Processes

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

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