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On phase equilibria in duplex stainless steels
RISE, Swerea, Swerea KIMAB.
Outokumpu Stainless AB.
Outokumpu Stainless Research Foundation.
2010 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 81, no 5, 337-346 p.Article in journal (Refereed)
Abstract [en]

The equilibrium conditions of four duplex stainless steels; Fe-23Cr-4.5Ni-0.1N, Fe-22Cr-5.5Ni-3Mo-0.17N, Fe-25Cr-7Ni-4Mo-0.27N and Fe-25Cr-7Ni-4Mo-1W-1.5Cu-0.27N were studied in the temperature region from 700 to 1000 8C. Phase compositions were determined with SEM EDS and the phase fractions using image analysis on backscattered SEM images. The results showed that below 1000° the steels develop an inverse duplex structure with austenite and sigma phase, of which the former is the matrix phase. With decreasing temperature, the microstructure will be more and more complex and finely dispersed. The ferrite is, for the higher alloyed steels, only stable above 1000 ° and at lower temperatures disappears in favour of intermetallic phases. The major intermetallic phase is sigma phase with small amounts of chi phase, the latter primarily in high Mo and W grades. Nitrides, not a focus in this investigation, were present as rounded particles and acicular precipitates at lower temperatures. The results were compared to theoretical predictions using the TCFE5 and TCFE6 databases.

Place, publisher, year, edition, pages
2010. Vol. 81, no 5, 337-346 p.
Keyword [en]
Duplex stainless steel, Intermetallic phases, Phaseequilibrium, Sigma phase, Thermo-calc
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-12870DOI: 10.1002/srin.201000010Scopus ID: 2-s2.0-77953943385OAI: oai:DiVA.org:ri-12870DiVA: diva2:973063
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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CiteExportLink to record
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