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Evaluation of Austenite Reformation in Duplex Stainless Steel Weld Metal using Computational Thermodynamics
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Computational Thermodynamics.ORCID iD: 0000-0001-5031-919X
2014 (English)In: Welding in the World, ISSN 0043-2288, E-ISSN 1878-6669, Vol. 58, no 2, 217-224 p.Article in journal (Refereed) Published
Abstract [en]

This paper provides a theoretical study of austenite reformation during cooling of duplex stainless weld metal using computational thermodynamics and kinetics. Model alloys of the superduplex 2509 weld metal and 2205 base material were used for the study and austenite reformation was calculated at equilibrium conditions and at cooling rates from 0.01 to 2,000 K/s. The calculations also provided the possibility to study the distribution of the alloying elements at ferrite and austenite phase boundaries. The importance of nitrogen for austenite reformation at rapid cooling was studied by comparing with simulations for a low-nitrogen alloy. The results were also compared with experimental and model results from the literature providing good correlation and the unique possibility to study the distribution of alloying elements between the growing austenite and the shrinking ferrite.

Place, publisher, year, edition, pages
2014. Vol. 58, no 2, 217-224 p.
Keyword [en]
Duplex stainless steel, Weld metal, Austenite, Mathematical models, Thermodynamics
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-121334DOI: 10.1007/s40194-013-0104-9ISI: 000331002600007Scopus ID: 2-s2.0-84898992877OAI: oai:DiVA.org:kth-121334DiVA: diva2:618457
Note

QC 20140128. Updated from submitted to published Epub ahead of print

Available from: 2013-04-28 Created: 2013-04-28 Last updated: 2017-12-06Bibliographically approved
In thesis
1. 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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Selleby, Malin

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