Proceedings of the KWS Conference (대한용접접합학회:학술대회논문집)

The Korean Welding and Joining Society (대한용접접합학회)
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Microstructures and characteristics of friction stir welded 304 stainless steel

304 스테인레스강 FSW부의 조직 및 특성

  • ;
  • Yutaka S. Sato (Department of Materials Processing, Graduate School of Engineering, Tohoku University) ;
  • Hiroyuki Kokawa (Department of Materials Processing, Graduate School of Engineering, Tohoku University) ;
  • Kazutaka Okamoto (Hitachi Research Laborator) ;
  • Satoshi Hirano (Hitachi Research Laborator) ;
  • Masahisa Inagaki (Department of Materials Processing, Graduate School of Engineering, Tohoku University)
  • Published : 2004.05.01
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Abstract

The microstructural evolution in a 304 stainless steel weld during FSW was examined. The SZ and TMAZ showed typical dynamically recrystallized and recovered microstructures, respectively, The microstructural observation revealed that sigma phase was formed at the advancing side of the stir zone. A possibility was suggested that the rapid formation of the sigma phase is related to the transformation of austenite to delta-ferrite in the stir zone, from introduction of high strain and dynamic recrystallization during FSW.

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