Microstructural Stability and Mechanical Properties of a High Nitrogen Super Duplex Stainless Steel

Nilsson, Jan-Olof; Kangas, Pasi; Karlsson, T.; Wilson, A. D.

doi:10.4028/www.scientific.net/msf.318-320.751

Cited by 6 publications

(4 citation statements)

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“…Considering the following PRE formula (Eq. 1) [30,31] and using the elemental composition obtained by the TEM/EDS point analysis (Table II) except the N contents which are based on the considerations mentioned in section 3.1.2, it was found that the PRE number is between 34 and 35 for the austenite phase and around 41 for the ferrite matrix (excluding the nitride particles). This calculation would suggest a higher susceptibility of austenite, having lower PRE number, to initiate pitting corrosion than the ferrite phase at temperature above the CPT.…”

Section: Influence Of Temperature On the Corrosion Behavior Of 2205 Dssmentioning

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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Section: Influence Of Temperature On the Corrosion Behavior Of 2205 Dssmentioning

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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“…Duplex Stainless Steels (DSSs) and Super Duplex Stainless Steels (SDSSs) possess high mechanical and corrosion resistance properties, which can be ascribed to the presence of the characteristic biphasic structure, where austenite and ferrite are present in almost equal volume fractions [1,2]. If the ferrite-to-austenite phase ratio is indeed in the range 0.4-0.6, these steels reach their most advantageous properties.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Solid-State Phase Transformations in a 2510 Duplex Stainless Steel Grade

Calliari

Breda²,

Gennari

et al. 2020

Metals

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Duplex and Super Duplex Stainless Steels are very prone to secondary phases formation related to ferrite decomposition at high temperatures. In the present paper the results on secondary phase precipitation in a 2510 Duplex Stainless Steel, heat-treated in the temperature range 850–1050 °C for 3–30 min are presented. The precipitation starts at grain boundaries with a consistent ferrite transformation for very short times. The noses of the Time–Temperature–Precipitation (TTP) curves are at 1000 °C for σ-phase and at 900 °C for χ-phase, respectively. The precipitation sequence involves a partial transformation of χ into σ, as previously evidenced in 2205 and 2507 grades. Furthermore, the experimental data were compared to the results of Thermo-Calc calculations. Understanding and ability to predict phase stability in 2510 duplex stainless steel is a key factor to design optimal welding processes that avoid any secondary phase precipitation in the weld bead as well as in the heat-affected zone.

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“…Duplex Stainless Steels (DSSs) and Super Duplex Stainless Steels (SDSSs) possess high mechanical and corrosion-resistance properties, which can be ascribed to the presence of the characteristic biphasic structure, where austenite and ferrite are present in almost equal volume fractions [1,2]. If ferrite-to-austenite phase ratio is indeed in the range 0.4÷0.6, these steels reach their most advantageous properties.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Solid State Phase Transformations in a 2510 Duplex Stainless Steel Grade

Calliari¹,

Breda²,

Gennari³

et al. 2020

Preprint

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Duplex and Super Duplex Stainless Steels are very prone to secondary phases formation related to ferrite decomposition at high temperatures. In the present paper the results on secondary phase precipitation in a 2510 Duplex Stainless Steel, heat treated in the temperature range 850-1050 °C for 3-30 minutes are presented. The precipitation starts at grain boundaries with a consistent ferrite transformation for very short times. The noses of the TTP curves are at 1000 °C for σ-phase and at 900 °C for χ-phase, respectively. The precipitation sequence involves a partial transformation of χ into σ, as previously evidenced in 2205 and 2507 grades. Furthermore, the experimental data were compared to the results of Thermo-Calc calculations.

show abstract

Microstructural Stability and Mechanical Properties of a High Nitrogen Super Duplex Stainless Steel

Cited by 6 publications

References 0 publications

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

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

Investigation on Solid-State Phase Transformations in a 2510 Duplex Stainless Steel Grade

Investigation on Solid State Phase Transformations in a 2510 Duplex Stainless Steel Grade

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