Paper Title:
Intermetallic Phase Precipitation in Duplex Stainless Steels during High Temperature Exposition
  Abstract

The intermetallic phase precipitation, mainly sigma () and chi () phases, was studied in a comparative manner in two stainless duplex steels: a duplex type UNS S31803 and a superduplex type UNS S32520. The -phase precipitated at ferrite/ferrite grain boundaries prior to the -phase precipitation, which occurred preferentially at ferrite/austenite interfaces and at ferrite/ferrite grain boundaries. The -phase precipitation is a eutectoid type reaction of ferrite, leading to -phase and austenite (γ). The -phase precipitated at lower temperatures and in smaller amounts than sigma. The -phase is metastable in the studied steels and was consumed during the -phase precipitation.

  Info
Periodical
Materials Science Forum (Volumes 636-637)
Edited by
Luís Guerra ROSA and Fernanda MARGARIDO
Pages
478-484
DOI
10.4028/www.scientific.net/MSF.636-637.478
Citation
D.M. Escriba, E. Materna-Morris, R.L. Plaut, A. F. Padilha, "Intermetallic Phase Precipitation in Duplex Stainless Steels during High Temperature Exposition", Materials Science Forum, Vols. 636-637, pp. 478-484, 2010
Online since
January 2010
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