In-situ measurement and numerical simulation of nitriding kinetics of grain-oriented silicon steel

Wen, Pengyu; Luo, Haiwen; Zeng, Guimin; Li, Jun; Huang, Jun; Yan, Baijun

doi:10.1016/j.ijhydene.2017.02.200

Cited by 8 publications

(4 citation statements)

References 30 publications

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“…[ 19–21 ] However, unlike the reaction in which Fe 3 O 4 was reduced to Fe, hydrogen could reduce the lamellar oxides to the spherical ones in GOSS, and the reduction could be accelerated with the increase of temperature, as found in our previous research. [ 22 ] In addition, the N distributions in Figure 1e,j indicate that N atoms are not in the oxide particles but in the matrix; i.e., N atoms penetrate into the iron matrix by diffusion during nitriding.…”

Section: Resultsmentioning

confidence: 99%

Why Does Nitriding of Grain‐Oriented Silicon Steel Become Slower at Higher Temperature?

Guo

Gong

et al. 2021

steel research int.

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The nitriding process plays an essential role in the production of grain‐oriented silicon steel (GOSS) via the acquired‐inhibitor process. It is surprising at first glance to find that the increase of temperature from 840 to 930 °C retards the nitriding of GOSS rather than accelerating it. By both extensive microstructural characterization and thermodynamic calculations, this is attributed to the formation of austenite at high temperature in the oxidization layer, in which N atoms diffuse at a much lower rate than in ferrite. It is concluded that there exists an upper‐limit temperature for the efficient nitriding of GOSS, which is determined by both the preceding decarburization process and the nitriding atmosphere.

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Section: Resultsmentioning

confidence: 99%

Why Does Nitriding of Grain‐Oriented Silicon Steel Become Slower at Higher Temperature?

Guo

Gong

et al. 2021

steel research int.

Self Cite

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“…The oxide subscale was initially formed in the oxidizing atmosphere of the process of decarburization, and regulated further in the reducing atmosphere of the process of reduction. The composition and thickness of the oxide layer have significant influences on the subsequent process of nitriding [19], as well as high-temperature annealing. The subsequent results of nitriding, Mg 2 SiO 4 substrate formation, and the final magnetic performances of the materials tested show that a suitable oxide subscale was achieved in the pilot line.…”

Section: Oxide Subscalementioning

confidence: 99%

Research and development of a pilot continuous annealing and MgO coating line for grain-oriented silicon steel

Hua

Zhang

et al. 2022

Ironmaking & Steelmaking

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To investigate the processes of continuous annealing and MgO coating of grain-oriented silicon steel (GO), a pilot-scale line was developed, which could realize functions such as cleaning, heating, decarburization, reduction, nitriding, and MgO coating in a coil-to-coil manner. A significant feature of the pilot line is the integrated furnace consisting of six furnace units and the inbetween separating devices, which work collaboratively to adjust the lengths, and to separate the annealing atmospheres and temperatures of the different process sections. A series of test runs and experiments was carried out on the line. The results showed that the pilot line had the characteristics of flexible process, accurate process parameters control and reliable atmosphere separation. The results of decarburization, reduction, nitriding, and coating met the requirements of GO. The pilot line provided an excellent platform for the experimental study of the processes of continuous annealing and MgO coating of GO.

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“…[17][18]. However, details about the nitriding kinetics, and most of all on the influence of the oxide layer on nitriding kinetics, and thus on the nitrogen enrichment and on control of the precipitation of inhibitors are missing in the literature [19][20][21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Influence of oxidizing and Nitriding parameters on nitrogen concentration of electrical steels

Jegou

Teodorescu²,

Barrallier³

et al. 2021

Materials Characterization

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In-situ measurement and numerical simulation of nitriding kinetics of grain-oriented silicon steel

Cited by 8 publications

References 30 publications

Why Does Nitriding of Grain‐Oriented Silicon Steel Become Slower at Higher Temperature?

Why Does Nitriding of Grain‐Oriented Silicon Steel Become Slower at Higher Temperature?

Research and development of a pilot continuous annealing and MgO coating line for grain-oriented silicon steel

Influence of oxidizing and Nitriding parameters on nitrogen concentration of electrical steels

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