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

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

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

Abstract

An addition of Ir to Ni base super alloy can increase the high temperature strength. An lr-containing 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 lr-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 - Held During TMS 2015 144th Annual Meeting and Exhibition
EditorsYuri Hovanski, Murray W. Mahoney, Yutaka Sato, Rajiv S. Mishra
PublisherMinerals, Metals and Materials Society
Pages77-82
Number of pages6
ISBN (Electronic)9781119082491
Publication statusPublished - 2015 Jan 1
EventFriction Stir Welding and Processing VIII - TMS 2015 144th Annual Meeting and Exhibition - Orlando, United States
Duration: 2015 Mar 152015 Mar 19

Publication series

NameTMS Annual Meeting
Volume2015-January

Other

OtherFriction Stir Welding and Processing VIII - TMS 2015 144th Annual Meeting and Exhibition
CountryUnited States
CityOrlando
Period15/3/1515/3/19

Keywords

  • Friction stir welding
  • Lr-containing Ni base superalloy
  • Mechanical properties
  • Microstructure
  • Stainless steel

ASJC Scopus subject areas

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

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