Microstructure and mechanical properties of friction stir welded SAF 2507 super duplex stainless steel

Y. S. Sato, T. W. Nelson, C. J. Sterling, R. J. Steel, C. O. Pettersson

Research output: Contribution to journalArticlepeer-review

241 Citations (Scopus)

Abstract

The microstructure and mechanical properties of friction stir (FS) welded SAF 2507 super duplex stainless steel were examined. High-quality, full-penetration welds were successfully produced in the super duplex stainless steel by friction stir welding (FSW) using polycrystalline cubic boron nitride (PCBN) tool. The base material had a microstructure consisting of the ferrite matrix with austenite islands, but FSW refined grains of the ferrite and austenite phases in the stir zone through dynamic recrystallisation. Ferrite content was held between 50 and 60% throughout the weld. The smaller grain sizes of the ferrite and austenite phases caused increase in hardness and strength within the stir zone. Welded transverse tensile specimen failed near the border between the stir zone and TMAZ at the retreating side as the weld had roughly the same strengths as the base material.

Original languageEnglish
Pages (from-to)376-384
Number of pages9
JournalMaterials Science and Engineering A
Volume397
Issue number1-2
DOIs
Publication statusPublished - 2005 Apr 25

Keywords

  • Duplex stainless steel
  • Friction stir welding
  • Mechanical properties
  • Microstructure

ASJC Scopus subject areas

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

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