Microstructure and mechanical properties of friction stir welded 430 stainless steel

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

11 Citations (Scopus)

Abstract

Friction stir welding (FSW) using polycrystalline cubic boron nitride (PCBN) tool was tried on a 430 ferritic stainless steel. The microstructural evolution and mechanical properties in the weld were examined. The base material (BM). having coarse elongated grain structure, changed to fine duplex microstructure of martensite and ferrite matrix in the stir zone (SZ) and the thermomechanically affected zone (TMAZ) during FSW. It is suggested that martensite transformation in the regions was promoted by both rapid cooling rate and high strain induced by severe plastic deformation caused by frictional stirring. The hardness of the SZ was much higher than that of the BM, which was explained by the martensite formation and finely distributed duplex microstructure. The 0.2% proof stress and ultimate tensile strength of the SZ were roughly twice higher than those of the BM. However, the SZ showed half the elongation of the BM due to large amounts of martensite.

Original languageEnglish
Title of host publicationProceedings of the International Offshore and Polar Engineering Conference
Pages6-12
Number of pages7
Publication statusPublished - 2005 Dec 1
Event15th International Offrshore and Polar Engineering Conference, ISOPE-2005 - Seoul, Korea, Republic of
Duration: 2005 Jun 192005 Jun 24

Publication series

NameProceedings of the International Offshore and Polar Engineering Conference
Volume2005
ISSN (Print)1098-6189
ISSN (Electronic)1555-1792

Other

Other15th International Offrshore and Polar Engineering Conference, ISOPE-2005
CountryKorea, Republic of
CitySeoul
Period05/6/1905/6/24

Keywords

  • Duplex microstructure
  • Ferrite
  • Ferritic stainless steel
  • Friction stir welding
  • Hardness
  • Martensite
  • Tensile properties

ASJC Scopus subject areas

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

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