Effect of Solubilization Temperature on the Sigma Phase Precipitation of a Superduplex Stainless Steel

Aline da Silva; Carlos Alberto Rodrigues; Antonio Carlos Ancelotti; Edmilson Otoni Corrêa; M.L.M. Noronha Melo

doi:10.4028/www.scientific.net/MSF.805.305

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HomeMaterials Science ForumMaterials Science Forum Vol. 805Effect of Solubilization Temperature on the Sigma...

Effect of Solubilization Temperature on the Sigma Phase Precipitation of a Superduplex Stainless Steel

Abstract:

Superduplex stainless steel is an important class of stainless steels because it combines the benefits of ferrite and austenite phases, resulting in steels with better mechanical properties and corrosion resistance. However, a significant problem of this steel is the precipitation of deleterious phases during heat treatment. Among these precipitated phases, the most relevant is the sigma phase, because it causes higher loss of properties. The objective of this work therefore is to study the sigma phase precipitation in the superduplex stainless steel UNS S32520 when submitted to heat treatment of solubilization in three different temperatures (1050 C, 1150o C and 1250° C) and subsequently aged in the temperature of 850oC during 10 minutes, 30 minutes, 60 minutes, 3 hours and 10 hours, followed by water quenching. The results showed that as the solubilization temperature increases, there is a significant grain growth and an increase of the ferrite volumetric fraction, which delays the sigma phase precipitation in this superduplex stainless steel. Moreover, it can be verified that the hardness of the material is directly related to volumetric fraction of sigma present in the steel.

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Periodical:

Materials Science Forum (Volume 805)

Pages:

305-310

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.805.305

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Online since:

September 2014

Authors:

Aline da Silva*, Carlos Alberto Rodrigues, Antonio Carlos Ancelotti, Edmilson Otoni Corrêa, M.L.M. Noronha Melo

Keywords:

Aging, Sigma Phase, Solubilization, Superduplex Stainless Steels

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