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Deformation-Induced Dynamic Ferrite Transformation During Hot-Rolling in Oxide Dispersion-Strengthened Ferritic Steel with 9 Wt Pct Cr Content

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Abstract

9CrODS steel, a candidate fission and fusion structural material, was subjected to hot-rolling with varying parameters of surface temperature and cooling rate just after hot-rolling. The deformation-induced dynamic ferrite transformation was confirmed at the rolling temperature 805 °C above Ar3 (780 °C). This transformation exhibits three characteristic features: transformation for extremely short duration (0.044 second), retaining carbon content equal to the original without long-distance carbon diffusion, and elongated coarse ferrite grains (10 μm). The massive transformation was proposed for the dynamic ferrite transformation from the hot-rolled austenite. The driving force for massive transformation was quantitatively estimated considering dislocations accumulated by hot-rolling. It was also shown that the oxide particles in 9CrODS steel play a critical role for dynamic ferrite transformation by suppressing the dynamic recrystallization at hot-rolling.

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Acknowledgments

The authors thank Dr. R. Kayano and Mr. E. Maeda of Japan Steel Works, Ltd. (JSW) for conducting hot-rolling. This work was supported by Grant-in-Aid for Scientific Research (Challenging Exploratory Research), 15K14172, Japan Society for the Promotion of Science (JSPS). This work was conducted at Hokkaido University, supported by the “Nanotechnology Platform” Program of the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.

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Authors and Affiliations

  1. Graduate School of Engineering, Hokkaido University, Sapporo, 060-8628, Japan

    Shoki Kasai, T. Yamashiro & S. Zhang

  2. Faculty of Engineering, Hokkaido University, Sapporo, 060-8628, Japan

    S. Ukai, N. Oono & S. Hayashi

  3. Japan Atomic Energy Agency, Oarai, 311-1393, Japan

    S. Ohtsuka

  4. National Institutes for Quantum and Radiological Science and Technology, Rokkasyo, 039-3212, Japan

    H. Sakasegawa

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  1. Shoki Kasai
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Correspondence to Shoki Kasai.

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Manuscript submitted date May 25, 2018.

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Kasai, S., Ukai, S., Yamashiro, T. et al. Deformation-Induced Dynamic Ferrite Transformation During Hot-Rolling in Oxide Dispersion-Strengthened Ferritic Steel with 9 Wt Pct Cr Content. Metall Mater Trans A 50, 590–600 (2019). https://doi.org/10.1007/s11661-018-5056-7

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