Journal of Materials Science

, Volume 45, Issue 18, pp 5089–5093 | Cite as

Intragranular formation of austenite during delta ferrite decomposition in a duplex stainless steel

  • Eduardo Franco de Monlevade
  • Helio Goldenstein
  • Ivan Gilberto Sandoval Falleiros
ICAM 2009


A Fe–22.5%Cr–4.53%Ni–3.0%Mo duplex stainless steel was solution treated at 1,325 °C for 1 h, quenched in water and isothermally treated at 900 °C for 5,000 s. The crystallography of austenite was studied using EBSD technique. Intragranular austenite particles formed from delta ferrite are shown to nucleate on inclusions, and to be subdivided in twin-related sub-particles. Intragranular austenite appears to have planar-only orientation relationships with the ferrite matrix, close to Kurdjumov–Sachs and Nishyiama–Wassermann, but not related to a conjugate direction. Samples treated at 900 °C underwent sparse formation of sigma phase and pronounced growth of elongated austenite particles, very similar to acicular ferrite.


Ferrite Austenite Orientation Relationship Duplex Stainless Steel Acicular Ferrite 
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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Eduardo Franco de Monlevade
    • 1
  • Helio Goldenstein
    • 1
  • Ivan Gilberto Sandoval Falleiros
    • 1
  1. 1.Departamento de Engenharia Metalúrgica e de MateriaisEscola Politécnica da Universidade de São PauloSão PauloBrazil

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