Grain structural characterization of 9Cr-ODS steel aged at 973 K up to 10,000 h by electron backscatter diffraction

Yanfen Li, Hiroaki Abe, Feng Li, Yuhki Satoh, Yoshi Matsukawa, Tetsuya Matsunaga, Takeo Muroga

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

In this work, thermal aging experiments on 9Cr-ODS steel were carried out at 973 K from 100 h up to 10,000 h, and grain structural evolution was investigated mainly focusing on analyses by electron backscatter diffraction (EBSD). The EBSD maps revealed no significant morphological changes in the matrix grain structure under the long-term aging. Grain size increased slightly with increasing periods of aging time from 100 h to 10,000 h. Distribution of misorientation angles was not affected by the thermal aging. The fraction of low misorientation angles comprised of subgrains was about 40% before aging, and decreased slightly by aging time up to 10,000 h. Total grain boundary length and density per unit area did not change significantly by aging up to 5000 h. They decreased slightly after aging for 10,000 h, which may be caused by slight recovery of microstructure. However, the effects of slight changes in the grain structure on mechanical properties are expected to be negligible.

Original languageEnglish
Pages (from-to)568-572
Number of pages5
JournalJournal of Nuclear Materials
Volume455
Issue number1
DOIs
Publication statusPublished - 2014 Dec

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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