Characterization of microstructure, chemical composition, corrosion resistance and toughness of a multipass weld joint of superduplex stainless steel UNS S32750

Tavares, Sérgio Souto Maior; Pardal, Juan Manuel; Lima, Leonardo da Silva; Bastos, Ivan Napoleão; Nascimento, A. R. do; Souza, J.A. de

doi:10.1016/j.matchar.2006.07.006

Cited by 116 publications

(45 citation statements)

References 6 publications

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“…The weld metal of DSS is more resistant to pitting corrosion than the base metal. Furthermore, the enhanced response of weld metal to pitting resistance is associated with the addition of Cr and Ni elements [105]. This finding is supported by Olsson [106], who reported that the stability of passive films gained from Cr and Ni would reduce the comprehensive decay of Fe and Cr.…”

Section: Pitting Corrosionmentioning

confidence: 66%

“…The presence of δ-ferrite with higher Cr content may deleteriously affect the corrosion resistance because of the potential difference between the δ-ferrite and austenite phases [109], but this The weld metal of DSS is more resistant to pitting corrosion than the base metal. Furthermore, the enhanced response of weld metal to pitting resistance is associated with the addition of Cr and Ni elements [105]. This finding is supported by Olsson [106], who reported that the stability of passive films gained from Cr and Ni would reduce the comprehensive decay of Fe and Cr.…”

Section: Samplesmentioning

confidence: 66%

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Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

Mohammed

Ishak

Aqida

et al. 2017

Metals

105

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Abstract:The effects of input heat of different welding processes on the microstructure, corrosion, and mechanical characteristics of welded duplex stainless steel (DSS) are reviewed. Austenitic stainless steel (ASS) is welded using low-heat inputs. However, owing to differences in the physical metallurgy between ASS and DSS, low-heat inputs should be avoided for DSS. This review highlights the differences in solidification mode and transformation characteristics between ASS and DSS with regard to the heat input in welding processes. Specifically, many studies about the effects of heat energy input in welding process on the pitting corrosion, intergranular stress, stress-corrosion cracking, and mechanical properties of weldments of DSS are reviewed.

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Section: Pitting Corrosionmentioning

confidence: 66%

Section: Samplesmentioning

confidence: 66%

Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

Mohammed

Ishak

Aqida

et al. 2017

Metals

105

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“…Predicted sigma phase evolution resulted after the finishing welding pass (heat input =1.2 kJ mm -1 ). Therefore the heat input and thickness are important parameters to take into account during the adequate selection of the welding procedure depending on the application 29,30 . The model presented in this study is an important tool to correctly design the suitable welding procedure and control of the changes on the HAZ.…”

Section: Effects Of Welding Parameters On Deleterious Phases Formationmentioning

confidence: 99%

Effects of Local Heat Input Conditions on the Thermophysical Properties of Super Duplex Stainless Steels (SDSS)

et al. 2018

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The properties of the super duplex stainless steels (SDSS) are strongly affected by the thermal history imposed by welding procedures. The controlled dual phase microstructure (ferrite and austenite) guarantee excellent mechanical properties such as mechanical strength and corrosion resistance, in addition to small thermal expansion coefficient and high thermal conductivity. In this paper, we newly proposed a model able to predict the thermal history of the welding pieces coupled with local mechanical properties developed during welding procedure that combine the effects of temperature and phase changes during welding. We applied inverse method to fit the thermophysical parameters based on measured data. The model was verified by comparing measured and predicted temperature profiles using thermocouples located within the heat affected zone. Thus, an inverse method was implemented to obtain the parameters fitting for the grain growth evolution compatible with the final microstructure and grain size measured using SEM images and stereological techniques. We demonstrated that very small amount of non-equilibrium deleterious phases and nanosized precipitated are expected during the welding procedures depending upon the local conditions of temperature, compositions and alloying dilution evolutions.

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“…Such alloys have thin passive film, essentially constituted by Cr 2 O 3 , cohesive and self-regenerative, which is responsible for the excellent corrosion resistance 7 . The superduplex stainless steel shows, in addition to excellent pitting resistance number, small grain of austeno-ferritic microstructure and alloy elements as Cr, Mo, N and Ni, which assure superior properties 8 . Nevertheless, the heat-treatments used during the production of equipments may cause the precipitations of deleterious intermetallic components like sigma phase, making the steel more susceptible to localized corrosion 2 .…”

Section: Introductionmentioning

confidence: 99%

Effect of carbon dioxide and temperature on passive film parametersof superduplex stainless steel

et al. 2013

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Superduplex stainless steel has been frequently employed in new sites of Brazilian Pre-Salt. In these environments, chloride concentration, temperature and carbon dioxide are normally present in higher levels than those at sea water at room temperature. In these conditions, it is expected that the passive films of stainless steel also show modifications. To better understand such modifications, samples of superduplex stainless steel UNS S32750 were submitted to electrochemical impedance measurements in brine media, at two temperatures and under presence/absence of carbon dioxide. The electrochemical impedance results were initially tested using the Kramers-Kronig transform and subsequently fitted by equivalent circuit employing constant phase elements -CPE. Moreover, to quantify the effect of each factor (temperature, chloride, carbon dioxide and microstructure) on the equivalent circuit, their parameters were tested applying statistical analysis. Significant effect of carbon dioxide and temperature was found on related parameters of passive film for heat-treated samples.

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Characterization of microstructure, chemical composition, corrosion resistance and toughness of a multipass weld joint of superduplex stainless steel UNS S32750

Cited by 116 publications

References 6 publications

Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

Effects of Heat Input on Microstructure, Corrosion and Mechanical Characteristics of Welded Austenitic and Duplex Stainless Steels: A Review

Effects of Local Heat Input Conditions on the Thermophysical Properties of Super Duplex Stainless Steels (SDSS)

Effect of carbon dioxide and temperature on passive film parametersof superduplex stainless steel

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