Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 673, Issue -, Pages 624-632Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.07.030
Keywords
Oxide dispersion strengthened steels; Microstructure; Nm-scale oxide particles; HRTEM; Strengthening mechanisms
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Funding
- project R&D of nuclear fuel cladding materials and their environmental degradations for the development of safety standards by Ministry of Education, Culture, Sports, Science and Technology (MEXT) in Japan
- China Scholarship Council
- Grants-in-Aid for Scientific Research [15K06663, 14F04903] Funding Source: KAKEN
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The microstructure of the 12Cr-ODS steel was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and electron bacicscatter 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. (C) 2016 Elsevier B.V. All rights reserved.
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