Advertisement

Journal of Materials Science

, Volume 45, Issue 3, pp 616–623 | Cite as

Modeling of deleterious phase precipitation during isothermal treatments in superduplex stainless steel

  • J. M. Pardal
  • S. S. M. TavaresEmail author
  • M. P. Cindra Fonseca
  • J. A. de Souza
  • A. Loureiro
  • E. P. Moura
Article

Abstract

The deleterious constituents σ, χ, and eutectoid γ2 can precipitate during hot forming and welding operations in superduplex stainless steels. In this study the precipitation of these phases in superduplex UNS S32750 was investigated. Two materials with similar composition and quite different grain sizes were used in the study. Specimens were subjected to isothermal treatments in the 800–950 °C temperature range for time periods up to 240 min. Under these conditions, quantifications of deleterious phases by light optical microscopy were carried out in order to model the precipitation kinetics of these deleterious constituents. A sigmoidal equation, similar to the one developed by Johnson–Mehl–Avrami was fitted to all the analyzed temperatures. Precipitation velocity was evaluated so as to compare the kinetics of deleterious phases in the two materials. The activation energies for precipitation were calculated based on Arrhenius equation.

Keywords

Ferrite Austenite Aging Temperature Sigmoidal Function Duplex Stainless Steel 

Notes

Acknowledgement

The authors would like to thank CAPES, FAPERJ, and CNPq for their financial support which made this work possible.

References

  1. 1.
    Muthupandi V, Srinivasan PB, Seshadri SK, Sundaresan S (2003) Mater Sci Eng A A358:9CrossRefGoogle Scholar
  2. 2.
    Chen TH, Weng KL, Yang JR (2002) Mater Sci Eng A A338:259CrossRefGoogle Scholar
  3. 3.
    Tavares SSM, Da Silva MR, Neto JM (2000) J Alloys Compd 313:168CrossRefGoogle Scholar
  4. 4.
    Lopez N, Cid M, Puiggali M (1999) Corros Sci 41:1615CrossRefGoogle Scholar
  5. 5.
    Pardal JM, Tavares, SSM, Cindra Fonseca, M, Souza JA, Vieira LM, Abreu HGF (2008) Caracterizaçâo microscópica de fases deletérias precipitadas durante tratamentos isotérmicos em aço inoxidável superduplex. In: 18º Congresso Brasileiro de Engenharia e Ciências dos Materiais. Porto de Galinhas, PE, BrazilGoogle Scholar
  6. 6.
    Ramirez Londoño AJ (1997) Estudo da precipitação de nitreto de cromo e fase sigma por simulação térmica da zona afetada pelo calor na soldagem multipassse de aços inoxidáveis duplex. Dissertação de Mestrado, Universidade Estadual de São PauloGoogle Scholar
  7. 7.
    Pardal JM, Tavares SSM, Cindra Fonseca M, Souza JA, Corte RRA, Abreu HGF (2009) Mater Charact 60:165CrossRefGoogle Scholar
  8. 8.
    Image Tool version 3.0, University of Texas Health Science Center at San Antonio, free softwareGoogle Scholar
  9. 9.
    Cortie MB, Jackson EMLEM (1997) Metall Mater Trans A 28A:2477CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • J. M. Pardal
    • 1
  • S. S. M. Tavares
    • 1
    Email author
  • M. P. Cindra Fonseca
    • 1
  • J. A. de Souza
    • 1
  • A. Loureiro
    • 1
  • E. P. Moura
    • 2
  1. 1.Departamento de Engenharia MecânicaUFF–Universidade Federal FluminenseNiteróiBrazil
  2. 2.Departamento de Engenharia Metalúrgica e MateriaisUFC–Universidade Federal do CearáFortalezaBrazil

Personalised recommendations