Microstructural evolution of 304 austenitic stainless steel during friction stir welding

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

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

Friction stir welding was applied to 304 austenitic stainless steel. The microstructural evolution and hardness distribution in the weld were investigated. The stir zone (SZ) and thermomechanically affected zone (TMAZ) showed dynamically recrystallised 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-grains. Electron microscopic observations revealed that ferrite and sigma phase were formed in austenite matrix in the SZ depending on the cooling rate during FSW.

Original languageEnglish
Pages (from-to)73-77
Number of pages5
JournalProceedings of the International Offshore and Polar Engineering Conference
Publication statusPublished - 2004 Dec 1
EventThe Fourteenth International Offshore and Polar Engineering Conference - ISOPE 2004 - Toulon, France
Duration: 2004 May 232004 May 28

Keywords

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

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Ocean Engineering
  • Mechanical Engineering

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