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The effect of copper on secondary phase precipitation in duplex stainless steel - a thermodynamic calculations approach
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Computational Thermodynamics.ORCID iD: 0000-0001-5031-919X
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Ceramics.
2005 (English)In: Zeitschrift für Metallkunde, ISSN 0044-3093, Vol. 96, no 8, 918-923 p.Article in journal (Refereed) Published
Abstract [en]

Thermodynamic calculations with Thermo-Calc software and the steel database TCFE3 was applied to investigate the precipitation behavior of industrial grades of duplex stainless steels with high copper content, 1.6 and 2.3 wt.%, Duplok 27 and DUP 27, respectively. Well-documented super duplex stainless grade SAF 2507 with copper content of 0.20 wt.% was used as the reference steel. The results of the calculations are compared with the experimental results obtained previously for these steels. It is shown that copper decreases the high-temperature limit of precipitation of sigma and chi phases and reduces the equilibrium amount of precipitated chi phase. Copper addition to a duplex stainless steel facilitates precipitation of chromium nitride phase and stabilizes it at elevated temperatures. The ferrite-austenite balance at high temperatures is also affected in these steels by the copper addition.

Place, publisher, year, edition, pages
2005. Vol. 96, no 8, 918-923 p.
Keyword [en]
Thermo-Calc, thermodynamic calculations, duplex stainless steels, copper, secondary phases, industrial heat-treatments, corrosion
URN: urn:nbn:se:kth:diva-15033ISI: 000231800500014ScopusID: 2-s2.0-24344450080OAI: diva2:333074
QC 20100525Available from: 2010-08-05 Created: 2010-08-05Bibliographically approved

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