Performance enhancement of Co-based alloy tool for friction stir welding of ferritic steel

Yutaka S. Sato, Masahiro Miyake, Shinichi Susukida, Hiroyuki Kokawa, Toshihiro Omori, Kiyohito Ishida, Shinya Imano, Seung Hwan C. Park, Itto Sugimoto, Satoshi Hirano

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

5 Citations (Scopus)


Co-based alloy tools having the γ/γ' microstructure with distribution of hard phases hardly experience large deformation and severe wear during friction stir welding (FSW) of ferritic steels at the welding temperature lower than the γ'-solvus. Further examinations implied that the tool wear were suppressed more effectively on Co-based alloy tool with larger volume fraction of hard phases with average size of 2 to 5 µm. In this study, Co-based alloy tools with different volume fractions of hard phases were designed, and effect of hard phases on tool wear was examined in FSW of 0.45% carbon steel. FSW trial showed that the tool wear decreased with increasing volume fraction of hard phases. At the volume fraction of 36%, the wear volume was successfully reduced to two third of that of the tool exhibiting the good wear resistance in a previous study. This study showed a possibility that the tool performance is effectively enhanced by further microstructure optimization of the tool material.

Original languageEnglish
Title of host publicationFriction Stir Welding and Processing VIII
PublisherSpringer International Publishing
Number of pages8
ISBN (Electronic)9783319481739
ISBN (Print)9781119082491
Publication statusPublished - 2016 Jan 1


  • Co-based alloy
  • Ferritic steel
  • Friction stir welding
  • Welding tool


Dive into the research topics of 'Performance enhancement of Co-based alloy tool for friction stir welding of ferritic steel'. Together they form a unique fingerprint.

Cite this