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Journal of Materials Science

, Volume 46, Issue 21, pp 6916–6924 | Cite as

The phase stability in Cr–Ni and Cr–Mn duplex stainless steels

  • I. Calliari
  • M. Pellizzari
  • M. Zanellato
  • E. RamousEmail author
Article

Abstract

The formation of secondary phases during isothermal treatments in the range 750–1000 °C and continuous cooling in 2205, 2507, 2304, and 2101 duplex stainless steels have been investigated. For all the steels herein considered, the Thermocalc calculations indicate the sigma and chi-phase precipitation which is confirmed by the experimental results only for the 2205 and 2507 grades. On the contrary, the secondary phases are very rarely observed after both isothermal aging (up to 750 h) and/or continuous cooling tests in the 2304 and 2101 Cr–Mn grades. This behavior could be justified by the different ferrite and austenite phase stability in the four grades, in the same temperature range of the sigma and chi precipitation, because these differences affect the dangerous phases precipitation mechanism and kinetic.

Keywords

Ferrite Austenite Duplex Stainless Steel Isothermal Aging Solution Annealing 

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • I. Calliari
    • 1
  • M. Pellizzari
    • 2
  • M. Zanellato
    • 1
  • E. Ramous
    • 1
    Email author
  1. 1.DPCIUniversity of PadovaPadovaItaly
  2. 2.DMEITUniversity of TrentoTrentoItaly

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