Microscopic observation of precipitation behavior at friction stirring zone of super duplex stainless steel

Itto Sugimoto, Seung Hwan C. Park, Satoshi Hirano, Hikaru Saito, Satoshi Hata

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

To investigate the precipitation behavior of super duplex stainless steel in its weld by friction stir welding (FSW) at a low welding speed, we carried out microstructural observation and analysis. An intermetallic compound phase, ·, was observed in the heat affected zone (HAZ). The · phase precipitated at the interfaces between ¤-Fe (ferrite) and £ -Fe (austenite) grains 12 mm away from the stir zone (SZ)/HAZ boundary. On the other hand, the Cr2N was observed together with the belt-like £ -Fe grain aggregates in the vicinity of the advancing side (AS) of the SZ. The other intermetallic phase,», was also observed at a triple junction of £ -Fe grains. This demonstrates that the precipitation of the Cr2N and» phases correlates with the transformation of ¤-Fe to £A-Fe (secondary austenite).

Original languageEnglish
Pages (from-to)2003-2007
Number of pages5
JournalMaterials Transactions
Volume60
Issue number9
DOIs
Publication statusPublished - 2019

All Science Journal Classification (ASJC) codes

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

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