Friction stir welding of steels using a tool made of iridium-containing nickel base superalloy

Tatsuya Nakazawa, Yutaka S. Sato, Hiroyuki Kokawa, Kiyohito Ishida, Toshihiro Omori, Kunihiro Tanaka, Koichi Sakairi

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

3 Citations (Scopus)


An addition of Ir to Ni base super alloy can increase the high temperature strength. An Ircontaining Ni base superalloy produced through a process of rapid solidification casting, solution heat treatment and subsequent aging was found to exhibit a compressive strength greater than 500 MPa at 1000°C, which suggested it would be a suitable material to use in a friction stir welding (FSW) tool for high-softening-temperature materials, such as stainless steels and carbon steels. Precision tilt casting of this Ir-containing Ni base superalloy into a copper mold followed by appropriate heat treatment, resulted in tools with a fine γ/γ' microstructure containing intergranular carbides. These tools were subsequently proven capable of producing welds on AISI 304 stainless steel and ultrahigh carbon steel without large deformation or severe wear.

Original languageEnglish
Title of host publicationFriction Stir Welding and Processing VIII
PublisherSpringer International Publishing
Number of pages6
ISBN (Electronic)9783319481739
ISBN (Print)9781119082491
Publication statusPublished - 2016 Jan 1


  • Friction stir welding
  • Ir-containing ni base superalloy
  • Mechanical properties
  • Microstructure
  • Stainless steel


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