Journal ArticleDOI
Effect of weld metal chemistry and heat input on the structure and properties of duplex stainless steel welds
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TLDR
In this article, a low heat input process viz., EBW and another commonly employed process, gas tungsten-arc welding have been employed for welding of duplex stainless steels with and without nickel enhancement.Abstract:
The excellent combination of strength and corrosion resistance in duplex stainless steels (DSS) is due to their strict composition control and microstructural balance. The ferrite–austenite ratio is often upset in DSS weld metals owing to the rapid cooling rates associated with welding. To achieve the desired ferrite–austenite balance and hence properties, either the weld metal composition and/or the heat input is controlled. In the current work, a low heat input process viz., EBW and another commonly employed process, gas tungsten-arc welding have been employed for welding of DSS with and without nickel enhancement. Results show that (i) chemical composition has got a greater influence on the ferrite–austenite ratio than the cooling rate, (ii) and even EBW which is considered an immature process in welding of DSS, can be employed provided means of filler addition could be devised.read more
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Journal ArticleDOI
Influence of the grain size on deleterious phase precipitation in superduplex stainless steel UNS S32750
Juan Manuel Pardal,Sérgio Souto Maior Tavares,M. P. Cindra Fonseca,J.A. de Souza,R.R.A. Corte,H.F.G. de Abreu +5 more
TL;DR: In this article, the effect of grain size on deleterious phase precipitation in a superduplex stainless steel was investigated, and the results showed that the precipitation of deleTERious phases such as χ, σ and γ2, which can occur during welding and forming operations, is retarded by grain growth.
Journal ArticleDOI
Critical pitting temperature dependence of 2205 duplex stainless steel on dichromate ion concentration in chloride medium
TL;DR: In this article, the influence of various concentrations of dichromate ( Cr 2 O 7 2 - ) and chloride ions on critical pitting temperature (CPT) of duplex stainless steel 2205 (DSS 2205) is investigated by employing potentiodynamic and potentiostatic CPT measurement methods.
Journal ArticleDOI
Effect of nitrogen and nickel on the microstructure and mechanical properties of plasma welded UNS S32760 super-duplex stainless steels
K. Migiakis,G.D. Papadimitriou +1 more
TL;DR: In this article, the effect of nitrogen addition in the plasma operation gases and of the increase of nickel in the filler metal, on the microstructure and on the mechanical properties of super-duplex stainless steels welded by the plasma transferred arc (PTA) technique was investigated.
Journal ArticleDOI
Effects of nitrogen in shielding gas on microstructure evolution and localized corrosion behavior of duplex stainless steel welding joint
TL;DR: The effects of nitrogen addition in shielding gas on microstructure evolution and localized corrosion behavior of duplex stainless steel (DSS) welds were studied in this paper, where 2% N 2 to pure Ar shielding gas improved the localized corrosion resistance in the DSS welds, which was due to compensation for nitrogen loss and promoting nitrogen further solution in the austenite phases.
Journal ArticleDOI
Influence of thermal aging on sulfate-reducing bacteria (SRB)-influenced corrosion behaviour of 2205 duplex stainless steel
TL;DR: In this article, microbiologically-influenced corrosion behavior of thermally aged 2205 duplex stainless steel in comparison to the as-received material was studied by exposing the coupons for 40 days in chloride medium containing sulfate-reducing bacteria (SRB).
References
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Duplex stainless steels : microstructure, properties and applications
TL;DR: In this paper, the authors present a non-destructive testing of welds for service experience, based on the application of service experience in metallurgy and metallurgical applications.