Microstructural evolution in 304 austenitic stainless steel during friction stir welding

Hiroyuki Kokawa, Seung Hwan C. Park, Yutaka S. Sato, Kazutaka Okamoto, Satoshi Hirano, Masahisa Inagaki

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)


The characteristics of microstructures in friction stir (FS) weld of 304 austenitic stainless steel were examined. The stir zone (SZ) and thermomechanically affected zone (TMAZ) showed dynamically recrystallized and recovered microstructures, respectively. The hardness of the SZ was higher than that of the base material and the maximum hardness was located in the TMAZ. The higher hardness in TMAZ was attributed to high density of dislocations and sub-boundaries. Electron microscopic observations revealed that ferrite and sigma phases were formed in austenite matrix in the SZ during friction stir welding (FSW).

Original languageEnglish
Title of host publicationMaterials Science Forum - Advanced Welding and Micro Joining/Packaging for the 21st Century - Selected peer reviewed papers from the International Welding/Joining Conference-Korea 2007, IWJC 2007
EditorsChang Hee Lee, Jong-Bong Lee, Jong-Bong Lee, Dong-Hwan Park, Suck-Joo Na
PublisherTrans Tech Publications Ltd
Number of pages4
ISBN (Electronic)9780878493609
Publication statusPublished - 2008
EventInternational Welding/Joining Conference-Korea 2007, IWJC 2007 - Seoul, Korea, Republic of
Duration: 2007 May 102007 May 12

Publication series

NameMaterials Science Forum
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


ConferenceInternational Welding/Joining Conference-Korea 2007, IWJC 2007
Country/TerritoryKorea, Republic of


  • Austenite
  • Ferrite
  • Friction stir welding
  • Microstructure
  • Recovery
  • Recrystallization
  • Sigma
  • Stainless steel


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