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Effect of Annealing Atmosphere and Heating Rate on the Internal Oxidized Zone and Forsterite Film During Annealing

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Abstract

The use of Hi-B steel in the manufacture of transformer cores can save raw materials and greatly reduce the volume and energy consumption of the transformer. A film of forsterite on the steel surface provides a certain degree of insulation and forms by the reaction between the internal oxidized zone (IOZ) and the MgO coating during the high-temperature annealing. Therefore, the IOZ morphology is the key to affect the film morphology. This paper studies the effect of annealing atmosphere and heating rate on the morphology evolution of IOZ during the first heating stage of high-temperature annealing. The main factors affecting IOZ morphology are discussed in the context of the influence of its morphology evolution on the film morphology. The results show the change trend of IOZ thickness on the steel with MgO coating is completely different from that without MgO coating. The IOZ thickness in the steel with or without MgO coating jointly affects the forsterite film thickness.

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The raw/processed data required to reproduce these findings cannot be shared at this time as the data also forms part of an ongoing study.

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Acknowledgements

Project Q20211106 supported by Hubei Provincial Department of Education, China.

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, 947 Heping Avenue, Qingshan District, Wuhan, Hubei, People’s Republic of China

    Yue Guo, Luwei Pan, Weidong Zeng, Fangqin Dai & Yu Feng

  2. WISDRI Wuhan Iron and Steel Design & Research Institute Incorporation Limited, 12 Yejin Avenue, Qingshan District, Wuhan, Hubei, People’s Republic of China

    Xican Zeng

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  1. Yue Guo
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  2. Xican Zeng
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  3. Luwei Pan
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  4. Weidong Zeng
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  5. Fangqin Dai
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  6. Yu Feng
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Correspondence to Luwei Pan or Fangqin Dai.

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Guo, Y., Zeng, X., Pan, L. et al. Effect of Annealing Atmosphere and Heating Rate on the Internal Oxidized Zone and Forsterite Film During Annealing. Oxid Met 97, 477–492 (2022). https://doi.org/10.1007/s11085-022-10100-y

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  • DOI: https://doi.org/10.1007/s11085-022-10100-y

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