Effects of carbon and chromium on microstructure evolution and mechanical properties of friction stir weldment in medium-carbon steel

Chun Cheng, Kota Kadoi, Shun Tokita, Hidetoshi Fujii, Kohsaku Ushioda, Hiroshige Inoue

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The carbon and chromium contents significantly affected the microstructure evolution in the stir zones of medium-carbon steels during the friction stir welding (FSW). The stir zone of the 0.2%C–4%Cr steel has a high strength over 1.5 GPa with a good elongation of 30.3%, while the stir zones of the 0.4%C–2%Cr and 0.4%C–4%Cr steels had ultrahigh tensile strengths over 2 GPa with low elongation. Auto-tempered martensite is the main reason for the excellent balance of strength and ductility in the stir zone of 0.2%C–4%Cr steel.

Original languageEnglish
Article number138060
JournalMaterials Science and Engineering A
Volume762
DOIs
Publication statusPublished - 2019 Aug 5
Externally publishedYes

Keywords

  • Auto-tempering
  • Friction stir welding
  • Martensite
  • Medium-carbon steel
  • Microtwins

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Effects of carbon and chromium on microstructure evolution and mechanical properties of friction stir weldment in medium-carbon steel'. Together they form a unique fingerprint.

  • Cite this