Superplastic behaviour of commercial duplex stainless steel SAF 2304

J. L. Song, P. L. Blackwell

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The superplasticity of duplex stainless steel SAF 2304 was investigated at temperatures from 900 to 1050°C and strain rates from 10-4 to 10-2 s-1 using uniaxial tensile tests. Within the range of temperatures and strain rates at which superplasticity occurred, the flow stress was under 20 MPa, and the instantaneous strain rate sensitivity was between 0·45 and 0·75. The microstructural evolution was investigated using optical, scanning electron, and transmission electron microscopes. During superplastic deformation, the initially banded two phase structure progressively broke up and evolved into a homogeneously distributed structure. Also, the strain rate sensitivity index initially rose with strain. Two possible models were considered for this behaviour, one based on slip, and the other a more conventional grain boundary sliding/grain switching model.
Original languageEnglish
Pages (from-to)1285-1292
Number of pages7
JournalMaterials Science and Technology (United Kingdom)
Volume15
Issue number11
DOIs
Publication statusPublished - 30 Nov 1999

Keywords

  • superplasticity
  • duplex stainless steel SAF 2304
  • superplastic deformation

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