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

  • Shoki Kasai
  • S. Ukai
  • T. Yamashiro
  • S. Zhang
  • N. Oono
  • S. Hayashi
  • S. Ohtsuka
  • H. Sakasegawa
Article
  • 22 Downloads

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.

Notes

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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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • Shoki Kasai
    • 1
  • S. Ukai
    • 2
  • T. Yamashiro
    • 1
  • S. Zhang
    • 1
  • N. Oono
    • 2
  • S. Hayashi
    • 2
  • S. Ohtsuka
    • 3
  • H. Sakasegawa
    • 4
  1. 1.Graduate School of EngineeringHokkaido UniversitySapporoJapan
  2. 2.Faculty of EngineeringHokkaido UniversitySapporoJapan
  3. 3.Japan Atomic Energy AgencyOaraiJapan
  4. 4.National Institutes for Quantum and Radiological Science and TechnologyRokkasyoJapan

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