Temperature Dependence of σ Phase Formation in Surface Melted Duplex Stainless Steel

  1. Prof. Dr. P. Neumann2,
  2. Dr. D. Allen3 and
  3. Prof. Dr. E. Teuckhoff4
  1. Vida Knežević,
  2. Zorica Cvijović and
  3. Draginja Mihajlović

Published Online: 5 JAN 2006

DOI: 10.1002/3527606181.ch51

Steels and Materials for Power Plants, Volume 7

Steels and Materials for Power Plants, Volume 7

How to Cite

Knežević, V., Cvijović, Z. and Mihajlović, D. (2000) Temperature Dependence of σ Phase Formation in Surface Melted Duplex Stainless Steel, in Steels and Materials for Power Plants, Volume 7 (eds P. Neumann, D. Allen and E. Teuckhoff), Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim, FRG. doi: 10.1002/3527606181.ch51

Editor Information

  1. 2

    Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237 Düsseldorf, Germany

  2. 3

    ABB Asltom Power UK Ltd., Cambridge Road, Whetstone, Leicester LE9 GLH, United Kingdom

  3. 4

    Siemens AG, Postfach 3240, 91050 Erlangen, Germany

Author Information

  1. Faculty of Technology and Metallurgy, University of Belgrade, Belgrade, Yugoslavia

Publication History

  1. Published Online: 5 JAN 2006
  2. Published Print: 27 JUN 2000

Book Series:

  1. EUROMAT 99

ISBN Information

Print ISBN: 9783527301959

Online ISBN: 9783527606184

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Keywords:

  • steels for power plants;
  • materials for power plant;
  • temperature dependence of σ phase formation;
  • surface melted duplex stainless steel

Summary

The σ phase formation in GTA surface melted 22/7/2 copper-bearing duplex stainless steel was investigated in the range of 800°C to 1150°C. Annealing at 1050°C and below resulted in σ phase formation, which was preceded by the δ[RIGHTWARDS ARROW]γ2 transformation. At 800°C and 900°C, the σ phase forms by the in situ transformation and via the eutectoid reaction δ[RIGHTWARDS ARROW]σ+γ2, while at 1050°C it precipitates directly from the σ ferrite. This observation is supported by the Johnson-Mehl analysis. From a C shaped TTT diagram, the precipitation is most rapid at about 950°C At 1150°C, total σ dissolution occurs.