Study of Environmentally Assisted Cracking of Duplex Stainless Steels as a Result of the Presence of Sigma Phase

Mahajanam, Sudhakar; Case, Raymundo; Rincon, Hernan; McIntyre, Dale R.; Joosten, Michael W.; Gjesdal, S.; Monsen, Henning

doi:10.5006/1.3665356

Cited by 4 publications

(2 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…17 Sigma phase particles are precipitated at the ferrite/austenite interfaces and penetrate into the ferrite phase or grow along the ferrite/austenite in a shape of a butterfly. 12,18,19 Several studies [11][12][13][19][20][21][22][23] have shown that the impact toughness and the corrosion resistance of the DSS drastically decrease in the presence of even very low intermetallic phase amounts of the sigma phase, since it is the most critical for the DSS properties as previously mentioned.…”

Section: Introductionmentioning

confidence: 99%

Numerical method applied to duplex stainless steel welding

Xavier

Campos

Castro

2013

Ironmaking & Steelmaking

View full text Add to dashboard Cite

Microstructure plays an essential role in the attractive properties of the duplex stainless steels (DSSs) such as toughness and corrosion resistance. These properties are obtained by an adequate balance between the fractions of the ferrite and austenite phases, which can be modified when DSSs are welded. Besides the unbalanced fractions of ferrite and austenite, the precipitation of deleterious compounds at high temperatures such as sigma phase can also occur during DSS welding. In this work, a model based on transport equations was numerically implemented by the finite volume method in a computational code in order to simulate the 2205 DSS welding. It was able to evaluate qualitatively the sigma phase precipitation and the formation of the ferrite and austenite phases by calculating the cooling rates reached during 2205 DSS welding. The results are discussed in light of the previous work, and good agreement between numerical and experimental results was obtained.

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical method applied to duplex stainless steel welding

Xavier

Campos

Castro

2013

Ironmaking & Steelmaking

View full text Add to dashboard Cite

show abstract

“…It is possible that coherent alpha prime precipitation that was not detected by these authors contributed to increased HE susceptibility. The effect of sigma phase precipitation on the localised corrosion resistance of duplex stainless steel has been well documented [95]. Analytical electron microscopy combined with localised corrosion studies has shown that the effect of sigma phase in reducing the localised corrosion resistance of duplex stainless steels is due to the formation of a depleted gamma phase in the ferrite that leads to a wide chromium and Mo-depleted region [96,97].…”

Section: Effect Of Incoherent Precipitates (Carbides Nitrides and Imentioning

confidence: 99%

Corrosion-resistant alloy testing and selection for oil and gas production

Sridhar¹,

Thodla²,

Gui³

et al. 2017

Corrosion Engineering, Science and Technology

View full text Add to dashboard Cite

Corrosion-resistant alloys (CRAs) are employed in severe oil and gas production environments that operate at high pressures and temperatures and contain chlorides, CO 2 , and H 2 S. They exhibit high resistance to uniform corrosion in these environments due to their passivity. However, they can suffer from different forms of environmentally assisted cracking (EAC), depending on the environmental and metallurgical conditions. This paper reviews the recent literature of EAC in CRAs and presents an overall framework for evaluating the SCC based on electrochemical modelling of corrosion and repassivation potentials for localised corrosion. The modelling is supported by experimental data on crack growth as a function of environmental variables, alloy content, and potential.

show abstract