Hardness and micro-texture in friction stir welds of a nanostructured oxide dispersion strengthened ferritic steel

Wentuo Han, Shigeharu Ukai, Farong Wan, Yutaka Sato, Bin Leng, Hiroya Numata, Naoko Oono, Shigenari Hayashi, Qingxin Tang, Yoshito Sugino

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The goal of this study is to characterize the hardness distribution and texture evolution in a friction stir welded oxide dispersion strengthened (ODS) ferritic steel. Hardness profiles were plotted by collecting data on the transverse cross section of the joint. The texture evolution and microstructure characteristics were studied by electron backscattering diffraction (EBSD). Results showed that regions near the bottom of the stir zone were the weak points in hardness, as those regions comprise coarser grains compared with the adjacent regions. EBSD results showed that the grain characterization (size, shape, and aspect ratio) varied within different regions and provided important insight into the material flow within the stir zone. EBSD results also revealed that textures within different regions presented some features of rotating coincidence. By suitable rotations of the poles figures, textures within different regions could superpose with each other almost exactly.

Original languageEnglish
Pages (from-to)390-394
Number of pages5
JournalMaterials Transactions
Volume53
Issue number2
DOIs
Publication statusPublished - 2012 Mar 21

Keywords

  • Electron backscattering diffraction (EBSD)
  • Friction stir welding
  • Hardness
  • Oxide dispersion strengthened steel
  • Texture

ASJC Scopus subject areas

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

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