Superplasticity of (α+γ) duplex stainless steel with elongated secondary phase

T. Furuhara, K. Hikita, T. Maki

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Effect of initial (α+γ) microstructure on the superplasticity of a hot forged Fe-26Cr-8Ni (α+γ) duplex stainless steel with elongated secondary γ precipitates was examined. The hot forged specimens contain the (α+γ) duplex structure with γ phase elongated along the longitudinal direction of the forged bar. Heavy cold rolling of hot forged specimens promotes recrystallization of γ and a during heating to and holding at 1273K (tensile deformation temperature), resulting in the formation of finer, more equiaxed (α+γ) microduplex structures. The specimens heavily cold rolled after forging exhibit large superplastic elongation nearly the same as the (α+γ) microduplex specimen produced by a conventional thermomechanical processing (solution treatment + heavy cold rolling + aging) although hot forged specimens show much smaller elongation.

Original languageEnglish
Pages (from-to)53-58
Number of pages6
JournalMaterials Science Forum
Volume304-306
DOIs
Publication statusPublished - 1999
Externally publishedYes

Keywords

  • Duplex stainless steel
  • Grain boundary
  • Interface
  • Microstructure ferrite austenite
  • Recrystallization
  • Superplasticity

ASJC Scopus subject areas

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

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