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On the effect of nitrogen on duplex stainless steels
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics.
GM APERAM I R&D, St Denis, France.
2011 (English)In: Revue de métallurgie (Imprimé), ISSN 0035-1563, Vol. 108, no 7-8, 413-425 p.Article in journal (Refereed) Published
Abstract [en]

One of the key issues in the development of the modern duplex stainless steels was the introduction of nitrogen as an alloying element. This was made possible by e. g. the AOD process and has meant that the problems with earlier grades regarding weldability could be solved. The prime reason for the lower weldability, namely a coarse-grained heat affected zone with inferior properties was then removed. Further beneficial effects of nitrogen increases in the new generation of duplex grades were pointed out: localized corrosion resistance particularly in chloride containing solutions, enhancement of fatigue properties, improved creep properties particularly when considering heat treatment ... The paper will outline the influence of nitrogen additions in duplex grades by means of thermodynamic calculations including phase diagrams, TTT phase precipitation diagrams from metallographic investigations, mechanical and corrosion properties. Metallographic investigations, corrosion resistance properties and mechanical properties will be presented. The specific links between welded joints microstructures and properties with different nitrogen contents will be discussed.

Place, publisher, year, edition, pages
2011. Vol. 108, no 7-8, 413-425 p.
Keyword [en]
Duplex stainless steel, nitrogen, structure, phase diagram, mechanical and corrosion resistance properties
National Category
Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-92425DOI: 10.1051/metal/2011071ISI: 000300378900003ScopusID: 2-s2.0-84867472783OAI: diva2:514111
QC 20120405Available from: 2012-04-05 Created: 2012-04-02 Last updated: 2012-04-05Bibliographically approved

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Hertzman, Staffan N.
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