Abstract
δ-ferrite steel designed with high aluminum low carbon and manganese meets the requirements of plate steel for lightweight and corrosion-resistant. The toughness of the steel is low because of the ordering of Fe-Al and even some intermetallic compounds. Austenite phase region shrinked with the increase of aluminum content, therefore the δ-ferrite is stable from high temperature to room temperature. The phase transformation cannot be used to refine grain, while the recrystallization is the only way to refine grain. The annealing recrystallization of steels after hot deformation were studied. The static recrystallization behavior has been studied by Gleeble. The grain size of 0.014Ti steel after annealing reaches about 5 urn, and the full-thickness Charpy impact is 55 J. With the content of Ti increasing, precipitated TiC pinning grain boundaries and dissolved Ti atoms interacting with the grain boundaries, inhibit recrystallization. In the same deformation process, the grains of 0.044Ti steel are more prolate and coarse. After annealing at 750 °C, the full-thickness Charpy impact is 38J.
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Xu, X., Wang, X., Li, J., Zhang, J. (2016). Recrystallization Behavior of δ-Ferrite in the Ti-Alloyed Low Density Steel. In: Holm, E.A., et al. Proceedings of the 6th International Conference on Recrystallization and Grain Growth (ReX&GG 2016). Springer, Cham. https://doi.org/10.1007/978-3-319-48770-0_13
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DOI: https://doi.org/10.1007/978-3-319-48770-0_13
Publisher Name: Springer, Cham
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