Friction stir spot welding of single-crystal austenitic stainless steel

J. Jeon, S. Mironov, Y. S. Sato, H. Kokawa, S. H.C. Park, S. Hirano

Research output: Contribution to journalArticlepeer-review

45 Citations (Scopus)

Abstract

The high-resolution electron backscatter diffraction technique was employed to study the structural response of single-crystal austenitic stainless steel to friction stir spot welding. The strain-induced crystal rotations were found to be governed by simple-shear deformation. In contrast to aluminum alloys, the developed texture showed pronounced A/A {1 1 1}〈1 1 0〉 simple-shear texture components, this effect being attributed to the suppression of cross-slip. Grain boundary development was demonstrated to be closely linked with texture evolution. During pin plunging, at relatively low temperatures, microstructural evolution was shown to be dictated by continuous recrystallization. Due to this process, the single-crystal structure was broken up into an ultrafine-grained polycrystalline aggregate with a mean grain size of ∼0.2 μm. During shoulder contacting, however, the temperature rose and discontinuous recrystallization became predominant.

Original languageEnglish
Pages (from-to)7439-7449
Number of pages11
JournalActa Materialia
Volume59
Issue number20
DOIs
Publication statusPublished - 2011 Dec

Keywords

  • Austenitic stainless steel
  • Electron backscatter diffraction
  • Friction stir welding
  • Recrystallization
  • Single crystal

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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