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Influence of TiO2 on Intragranular Acicular Ferrite Nucleation in Low-Carbon Steel

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Abstract

Oxide metallurgy technology uses inclusion to induce Intragranular acicular ferrite (IAF). The purpose is to refine the steel’s organization and improve its strength. However, the mechanism that inclusion induces IAF nucleation is still unclear. To solve this problem, we added TiO2 into the low-carbon steel to investigate the ferrite nucleation mechanism induced by Ti inclusions by SEM, TEM, and EPMA. The results show that TiO2 was added to the molten steel to form composite inclusions TiN–MnS–3MnO·Al2O3·3SiO2–Ti3O5 by temperature control. These inclusions are effective in inducing IAF nucleation. It is consistent with the depletion zone mechanism and low mismatch degree mechanism. It is attributed to MnS inclusions in the composite inclusions and Mn elements in the solute poverty zone. The mismatch strain between TiN–MnS–3MnO·Al2O3·3SiO2–Ti3O5 and IAF is less than 6%. The in-depth study of the mechanism of induced IAF nucleation by containing Ti inclusions is conducive to promoting the progress of oxide metallurgy technology.

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Authors and Affiliations

  1. Department of Material Engineering, Hebei Vocational University of Industry and Technology, Shijiazhuang, 050091, Hebei, People’s Republic of China

    Weiqing Huang

  2. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, People’s Republic of China

    Qiuping Li

  3. Bozhou University College of Traditional Chinese Medicine, Bozhou, 236000, Anhui, People’s Republic of China

    Aojia Li

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  1. Weiqing Huang
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  2. Qiuping Li
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  3. Aojia Li
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Correspondence to Qiuping Li.

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Huang, W., Li, Q. & Li, A. Influence of TiO2 on Intragranular Acicular Ferrite Nucleation in Low-Carbon Steel. Trans Indian Inst Met (2024). https://doi.org/10.1007/s12666-024-03264-5

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