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Sigma phase precipitation on welded SAF 2205 Duplex Stainless Steels after isothermal heat treatment
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Technology.ORCID iD: 0000-0002-8494-3983
2014 (English)In: Materials Research Society Symposium Proceedings, 2014, 177-182 p.Conference paper (Refereed)
Abstract [en]

Duplex stainless steels are commonly used for various applications owing to their superior corrosion resistance and/or strength. They have ferromagnetic behavior together with a good thermal conductivity and a lower thermal expansion as a result of higher ferrite content than austenitic steels. Their ferrite matrix suffers a decomposition process during aging in the temperature range 650-950°C producing precipitation of austenite, σ and x, carbides and nitrides. These intermetallic phases are known to be deleterious for corrosion resistance and mechanical properties. In this work the effect of aging time during isothermal treatment at 850°C and 900°C on the microstructure of SAF 2205 Duplex Stainless Steels welded plates has been investigated. The aim of this work is to determine the morphology of σ phase, and perform a quantitative analysis of the precipitation process Submerged Arc Welding is used for processing. It produces a high content of δ ferrite in the heat affected zone and low content of austenite in the weld. Microstructural examination shows that the σ phase precipitates at δ ferrite/γ interphases. Longer aging treatments give rise to an increase of volume fraction together with a coarser morphology.

Place, publisher, year, edition, pages
2014. 177-182 p.
Keyword [en]
Austenite, Carbides, Corrosion, Corrosion resistance, Electric welding, Ferrite, Isotherms, Mechanical properties, Morphology, Precipitation (chemical), Submerged arc welding, Thermal conductivity, Thermal expansion, Welded steel structures, Decomposition process, Duplex stainless steel, Ferromagnetic behaviors, Isothermal heat treatments, Microstructural examination, Precipitation process, SAF 2205 duplex stainless steel, Sigma-phase precipitation, Welding
National Category
Materials Engineering
URN: urn:nbn:se:kth:diva-167943DOI: 10.1557/opl.2014.776ScopusID: 2-s2.0-84911491832ISBN: 9781605115887OAI: diva2:817399
22nd International Materials Research Congress, IMRC 2013, 11 August 2013 through 15 August 2013

QC 20150605

Available from: 2015-06-05 Created: 2015-05-22 Last updated: 2015-06-05Bibliographically approved

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Sandström, Rolf
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