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On the effect of nitrogen on duplex stainless steels

Published online by Cambridge University Press:  02 February 2012

S. Hertzman  and
J. Charles
S. Hertzman
Affiliation:
Outokumpu Stainless Research Foundation, Royal Institute of Technology, KTH, Brinellvägen 23, SE-100 44 Stockholm, Sweden. e-mail: [email protected]
J. Charles
Affiliation:
GM APERAM I-R&D, La Plaine St-Denis, France; e-mail: [email protected]
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Abstract

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.

Keywords

Duplex stainless steelnitrogenstructurephase diagrammechanical and corrosion resistance propertiesAcier austéno-ferritiquesazotestructurediagrammes de phasepropriétés mécaniquestenue à la corrosion et fatigue
Type
Research Article
Information
Metallurgical Research & Technology , Volume 108 , Issue 7-8 , 2011 , pp. 413 - 425
Copyright
© EDP Sciences 2012

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