Effects of solution treatment and continuous cooling on σ-phase precipitation in a 2205 duplex stainless steel

Chen, T.H; Yang, Jer−Ren

doi:10.1016/s0921-5093(01)00911-x

Cited by 280 publications

(135 citation statements)

References 15 publications

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“…The most dangerous and also the most studied intermetallic compound in austenitic-ferritic stainless steels is the sigma phase (σ), which can be formed by slow continuous cooling 3,4 or by isothermal treatments 5 . According to published Temperature-Time-Transformation (TTT) diagrams 1,6 , the higher kinetics of precipitation occurs in the 800 -950 °C range.…”

Section: Introductionmentioning

confidence: 99%

Influence of Deleterious Phases Precipitation in the Corrosion Resistance Measured by Double Loop Electrochemical Polarization Reactivation Test in Superduplex Stainless Steel

et al. 2015

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This work investigates the influence of deleterious phases precipitation on the corrosion resistance of two wrought superduplex stainless steels UNS S32750 with similar composition, but different grain sizes. Isothermal treatments were carried out to introduce different amounts of deleterious phases, such as chi (χ), sigma (σ) and secondary austenite (γ 2 ). The specimens were tested by double loop electrochemical potentiodynamic reactivation test (DL-EPR). The kinetics of precipitation in the two steels was different due to the difference of the grain sizes. The results show a correlation between the sensitization degrees, measured by DL-EPR, with the amount of deleterious phases precipitated.

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Section: Introductionmentioning

confidence: 99%

Influence of Deleterious Phases Precipitation in the Corrosion Resistance Measured by Double Loop Electrochemical Polarization Reactivation Test in Superduplex Stainless Steel

et al. 2015

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“…Duplex stainless steels (DSSs), with austenite (γ) and ferrite (α) phases in almost equal amount, are widely used in marine environment, petrochemical, oil and gas, chemical and desalination industries, because of their greater corrosion and mechanical properties when compared to most of the austenitic stainless steels [1,2]. Products made of DSSs may require welding of different parts and/or exposure to high temperature during the processing of the material.…”

Section: Introductionmentioning

confidence: 99%

Study of corrosion behavior of a 22% Cr duplex stainless steel: Influence of nano-sized chromium nitrides and exposure temperature

Bettini

Kivisäkk

Leygraf

et al. 2013

Electrochimica Acta

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PostprintThis is the accepted version of a paper published in Electrochimica Acta. This paper has been peerreviewed but does not include the final publisher proof-corrections or journal pagination.Citation for the original published paper (version of record):Bettini, E., Kivisäkk, U., Leygraf, C., Pan, J. [Year unknown!] Study of corrosion behavior of a 22% Cr duplex stainless steel: influence of nano-sized chromium nitrides and exposure temperature. Electrochimica ActaAccess to the published version may require subscription. AbstractChromium nitrides may precipitate in duplex stainless steels during processing and their influence on the corrosion behavior is of great importance for the steel performance. In this study, the influence of nanosized quenched-in chromium nitrides on the corrosion behavior of a heat treated 2205 duplex stainless steel was investigated at room temperature and 50 °C (just above critical pitting temperature). The microstructure was characterized by SEM/EDS and AFM analyses, and quenched-in nitrides precipitated in the ferrite phase were identified by TEM analysis. Volta potential mapping at room temperature suggests lower relative nobility of the ferrite matrix. Electrochemical polarization and in-situ AFM measurements in 1 M NaCl solution at room temperature show a passive behavior of the steel despite the presence of the quenched-in nitrides in the ferrite phase, and preferential dissolution of ferrite phase occurred only at transpassive conditions. At 50 °C, selective dissolution of the austenite phase was observed, while the ferrite phase with the quenched-in nitrides remained to be stable. It can be concluded that the finely dispersed quenched-in nitrides do not cause localized corrosion, whereas the exposure temperature has a strong influence on the corrosion behavior of the duplex stainless steel.

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“…Sigma has been observed in both wrought [1][2][3][4] and cast alloys [8,9], in weld metal fusion and heat affected zones [10,11], and in continuously cooled DSS alloys [12], indicating its propensity to form under numerous materials processing conditions.…”

Section: Introductionmentioning

confidence: 99%

In situ observations of sigma phase dissolution in 2205 duplex stainless steel using synchrotron X-ray diffraction

Elmer

Palmer

Specht

2007

Materials Science and Engineering: A

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Synchrotron radiation was used to directly observe the transformation of ferrite, austenite and sigma phases during heating and cooling of 2205 duplex stainless steel. Sigma formed during the initial stages of heating, dissolved as the temperature was increased, and reformed on cooling. The dissolution temperature of sigma was measured to be 985ºC±2.8ºC at a heating rate of 0.25ºC/s, and the kinetics of sigma formation at 850ºC was determined to be slower after dissolving at 1000ºC than before.

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Effects of solution treatment and continuous cooling on σ-phase precipitation in a 2205 duplex stainless steel

Cited by 280 publications

References 15 publications

Influence of Deleterious Phases Precipitation in the Corrosion Resistance Measured by Double Loop Electrochemical Polarization Reactivation Test in Superduplex Stainless Steel

Influence of Deleterious Phases Precipitation in the Corrosion Resistance Measured by Double Loop Electrochemical Polarization Reactivation Test in Superduplex Stainless Steel

Study of corrosion behavior of a 22% Cr duplex stainless steel: Influence of nano-sized chromium nitrides and exposure temperature

In situ observations of sigma phase dissolution in 2205 duplex stainless steel using synchrotron X-ray diffraction

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