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On Phase Equilibria in Duplex Stainless Steels
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
Outokumpu Stainless AB, Avesta Research Centre, Avesta, Sweden.
Outokumpu Stainless Research Foundation, Stockholm.
2010 (English)In: STEEL RES INT, ISSN 1611-3683, Vol. 81, no 5, 337-346 p.Article in journal (Refereed) Published
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 degrees C. Phase compositions were determined with SEM EDS and the phase fractions using image analysis on backscattered SEM images. The results showed that below 1000 degrees C 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 degrees C 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, Phase Equilibrium, Intermetallic Phases, Sigma Phase, Thermo-Calc
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-27708DOI: 10.1002/srin.201000010ISI: 000278292200002OAI: oai:DiVA.org:kth-27708DiVA: diva2:379938
Note
QC 20101220Available from: 2010-12-20 Created: 2010-12-20 Last updated: 2013-04-29Bibliographically approved
In thesis
1. Application of computational thermodynamics to microstructure and properties of stainless steels
Open this publication in new window or tab >>Application of computational thermodynamics to microstructure and properties of stainless steels
2010 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: US-AB, 2010. [44] p.
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-27715 (URN)978-91-7415-762-8 (ISBN)
Presentation
2010-10-28, Sal B2, KTH, Brinellvägen 23, Stockholm, 14:00 (English)
Opponent
Supervisors
Note
QC 20101220Available from: 2010-12-20 Created: 2010-12-20Bibliographically approved
2. Applications of Computational Thermodynamics and Kinetics on Transformations in Stainless Steels
Open this publication in new window or tab >>Applications of Computational Thermodynamics and Kinetics on Transformations in Stainless Steels
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Stainless steels are high-alloyed, usually with multiple components and often also dual matrix phases, as for duplex stainless steels. This make predictions and calculations of alloying effects on equilibria and transformations complicated. Computational thermodynamics has emerged as an indispensable tool for calculations within these complex systems with predictions of equilibria and precipitation of phases. This thesis offers examples illustrating how computational methods can be applied both to thermodynamics, kinetics and coarsening of stainless steels in order to predict microstructure and, to some extent, also properties. The performance of a current state-of-the-art commercial thermodynamic database was also explored and strengths and weaknesses highlighted.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2013. 60 p.
Keyword
Stainless Steels, Duplex, Ferrite, Austenite, Computational Thermodynamics, Thermo-Calc, Dictra
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-121337 (URN)978-91-7501-714-3 (ISBN)
Public defence
2013-05-16, B2, Brinellvägen 23, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20130429

Available from: 2013-04-29 Created: 2013-04-28 Last updated: 2013-04-29Bibliographically approved

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