Microstructural characterization and strengthening mechanisms of a 12Cr-ODS steel

Jingjie Shen, Yanfen Li, Feng Li, Huilong Yang, Zishou Zhao, Sho Kano, Yoshitaka Matsukawa, Yuhki Satoh, Hiroaki Abe

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

The microstructure of the 12Cr-ODS steel was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electron backscatter diffraction (EBSD) techniques. The results showed that the microstructure consisted of fine and elongated grains, high density of dislocations, and large concentration of nm-scale oxide particles, which were identified as five types of crystal structures by high resolution TEM (HRTEM) imaging, such as monoclinic and cubic Y2O3, hexagonal and orthorhombic Y2TiO5, and cubic Y2Ti2O7. The dominant {001}<110> component and weaker <111> parallel to normal direction texture were observed. Besides, the yield stress was experimentally measured and quantitatively estimated. The findings indicated that theoretical calculation was in accordance with the experimental measurements, and strengthening contributions from solid-solution atoms and grain boundaries were linearly additive, whereas those from dislocations and oxide dispersoids were averaged by root mean square summation.

Original languageEnglish
Pages (from-to)624-632
Number of pages9
JournalMaterials Science and Engineering A
Volume673
DOIs
Publication statusPublished - 2016 Sep 15

Keywords

  • HRTEM
  • Microstructure
  • Nm-scale oxide particles
  • Oxide dispersion strengthened steels
  • Strengthening mechanisms

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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  • Cite this

    Shen, J., Li, Y., Li, F., Yang, H., Zhao, Z., Kano, S., Matsukawa, Y., Satoh, Y., & Abe, H. (2016). Microstructural characterization and strengthening mechanisms of a 12Cr-ODS steel. Materials Science and Engineering A, 673, 624-632. https://doi.org/10.1016/j.msea.2016.07.030