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The effect of copper on secondary phase precipitation in duplex stainless steel – a thermodynamic calculations approach

  • Olena Smuk EMAIL logo , Malin Selleby and Bill Bergman
Published/Copyright: February 1, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 96 Issue 8

Abstract

Thermodynamic calculations with Thermo-Calc software and the steel database TCFE3 was applied to investigate the precipitation behavior of industrial grades of duplex stainless steels with high copper content, 1.6 and 2.3 wt.%, Duplok 27 and DUP 27, respectively. Well-documented super duplex stainless grade SAF 2507 with copper content of 0.20 wt.% was used as the reference steel. The results of the calculations are compared with the experimental results obtained previously for these steels. It is shown that copper decreases the high-temperature limit of precipitation of sigma and chi phases and reduces the equilibrium amount of precipitated chi phase. Copper addition to a duplex stainless steel facilitates precipitation of chromium nitride phase and stabilizes it at elevated temperatures. The ferrite-austenite balance at high temperatures is also affected in these steels by the copper addition.

Keywords: Thermo-Calc; Thermodynamic calculations; Duplex stainless steels; Copper; Secondary phases
Olena Smuk Department of Materials Science and Engineering Royal Institute of Technology SE-10044 Stockholm, Sweden Tel.: +46 8 790 8289 +46 709 183 878 Fax: +46 8 20 76 81 +46 8 655 0949

  1. Thanks are due to Prof. B. Sundman, Department of Materials Science and Engineering, Royal Institute of Technology, Stockholm, Sweden, for valuable discussions of the manuscript. Our deep appreciation is due to Docent S. Hertzman, Outokumpu Stainless Research Foundation, for his constructive criticism and helpful suggestions.

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Received: 2004-04-05
Accepted: 2005-02-21
Published Online: 2022-02-01

© 2005 Carl Hanser Verlag, München

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https://doi.org/10.3139/ijmr-2005-0159
Keywords for this article
Thermo-Calc; Thermodynamic calculations; Duplex stainless steels; Copper; Secondary phases

Articles in the same Issue

  1. Frontmatter
  2. Articles Basic
  3. Diffusion in molybdenum disilicide
  4. Martensitic transformation, ductility, and shape-memory effect of polycrystalline Ni56Mn25 – xFexGa19 alloys
  5. Mechanical and electrical properties of Ti2SnC dispersion-strengthened copper
  6. Thermodynamic and phase relation study of the Ni–Ge –O system in the solid state
  7. Thermodynamic assessment of Mg–Al–Mn phase equilibria, focusing on Mg-rich alloys
  8. DSC study on the phase decomposition of an Al–Cu alloy occurring during annealing at 403 K
  9. Structure and thermal stability of a melt-quenched single-phase nanocrystalline Hf61Fe39 alloy
  10. Thermodynamic assessment of the ternary Cu–Pb–O system
  11. Combined EELS, EDX, and STEM investigations of Cu-induced nanostrucutures and thin surface layer phases
  12. Articles Applied
  13. Fatigue failure of titanium implants for mandibular reconstruction
  14. Solid state reaction mechanism for the synthesis of La1 – xSrxCoO3–δ (0.1 ≤ x ≤ 0.7)
  15. Dislocation structures in 16MND5 pressure vessel steel strained in uniaxial tension at –196 °C
  16. Microstructure of AZ91 alloy deformed by equal channel angular pressing
  17. The effect of copper on secondary phase precipitation in duplex stainless steel – a thermodynamic calculations approach
  18. Stretch-zone analysis by image processing for the evaluation of initiation fracture toughness of a HSLA steel
  19. Copper-lithium alloy produced by powder metallurgy procedures and its age-hardening response
  20. Effects of the local microstructures on the mechanical properties in FSWed joints of a 7075-T6 Al alloy
  21. Estimating ternary surface tension for systems with limited solubility
  22. Notifications/Mitteilungen
  23. Personal/Personelles
  24. News/Aktuelles
  25. Conferences/Konferenzen
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