Microstructure and properties of friction stir welded 304 stainless steel using W-based alloy tool

Yutaka Sato, Masahiro Muraguchi, Hiroyuki Kokawa

Research output: Contribution to conferencePaperpeer-review

10 Citations (Scopus)


Microstructure, and mechanical and corrosion properties were examined in 304 stainless steel friction-stir-welded using a tool made of a W-based alloy, and then these were compared with those of a weld produced by polycrystalline cubic boron nitride (PCBN) tool. Severe wear of the W-based alloy tool occurred during friction stir welding (FSW). The weld contained some tunnel-type defects in the stir zone. The microstructure in the bottom and advancing sides of the stir zone was relatively more sensitive for etching than the other regions, and it was identified as the duplex microstructure consisting of austenite and ferrite phases. W was enriched in the ferrite phase. The W-based alloy tool made the weld having roughly the same mechanical properties as the base material. The weld produced by the W-based alloy tool had the better corrosion resistance than that by the PCBN tool, although the corrosion resistance was slightly lower in the advancing side of the stir zone and heat affected zone (HAZ) than in the base material.

Original languageEnglish
Number of pages8
Publication statusPublished - 2007 Dec 1
Event4th Symposium on Friction Stir Welding and Processing - Orlando, FL, United States
Duration: 2007 Feb 252007 Mar 1


Other4th Symposium on Friction Stir Welding and Processing
Country/TerritoryUnited States
CityOrlando, FL


  • 304 stainless steel
  • Corrosion property
  • Friction stir welding
  • Mechanical properties
  • Microstructure
  • W-based alloy tool

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys


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