Investigation of stress corrosion cracks in a UNS S32750 superduplex stainless steel

Tavares, Sérgio Souto Maior; Silva, V.G.; Pardal, Juan Manuel; Corte, J.S.

doi:10.1016/j.engfailanal.2012.12.013

Cited by 35 publications

(19 citation statements)

References 12 publications

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“…Super duplex stainless steels (SDSS) (containing roughly 50 % austenite and 50 % ferrite) are effectively utilized in the gas, oil and nuclear industries, under harsh exploitation conditions, given their excellent combination of high mechanical strength and extraordinary corrosion resistance [1][2][3][4][5]. Due to the favorable ration of desired properties to cost, these steels are a good alternative to other higher performance materials such as super austenitic stainless steels and nickel-based alloys.…”

Section: Introductionmentioning

confidence: 99%

Effect of short duration solution treatment at temperatures below 1000 °C on σ‐phase precipitation in a super duplex stainless steel alloy

Cojocaru

Şerban

Angelescu

et al. 2018

Materialwissenschaft Werkst

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Super duplex stainless steel alloys are characterized by a high content of chromium, nickel, molybdenum and nitrogen. In these steels, the main role of chromium, nickel and molybdenum alloying elements is to increase corrosion resistance. Increased mechanical properties are obtained by adding nitrogen, which promotes structural hardening. The microstructure of super duplex stainless steels consists of a mixture of ferrite and austenite phases, while other phases are also formed, such as: sigma, chi, chromium nitride, carbides and secondary austenite. All secondary phases are considered deleterious phases due to their negative effect on corrosion resistance and mechanical properties. The precipitation formation mechanism of the sigma phase assumes depletion of chromium and molybdenum from the matrix, worsening the alloy properties. The aim of the present work is to show the microstructural changes occurring during a short duration (10 minutes) solution treating of an UNS S32760/1.4501/F55 alloy, three temperatures being considered: 800 °C, 900 °C and 1000 °C. Scanning electron microscopy (energy dispersive spectroscopy and electron backscattered diffraction) was used for quantifying the alloying elements distribution, to distinguish between the observed phases, and to better understand the evolution of each phase.

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Section: Introductionmentioning

confidence: 99%

Effect of short duration solution treatment at temperatures below 1000 °C on σ‐phase precipitation in a super duplex stainless steel alloy

Cojocaru

Şerban

Angelescu

et al. 2018

Materialwissenschaft Werkst

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“…Besides chemical composition, thermo-mechanical treatments have a significant influence on the properties of SDSS, hence the importance of studying this subject in order to improve their behaviour during industrial processing and exploitation. It has been shown that the high alloying content in these steels increases the risk of precipitation of intermetallic phases, with a negative effect on the corrosion resistance and ductility [5][6][7]. For example, it was reported that precipitation of sigma phase determines the formation of Cr-depleted determines the formation of Cr-depleted zones [12,13], leading to a decrease of mechanical and corrosion resistance and finally to premature failure [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…Super Duplex Stainless Steels (SDSS) are known to exhibit high mechanical and corrosion resistance properties, which recommend them to be used in hard exploitation conditions, such as those encountered in oil, chemical, marine and nuclear industrial fields [1][2][3][4][5][6][7][8]. A less favourable aspect is the poor hot ductility of SDSS, which makes their hot working to be very difficult [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Influence of Solution Treatment Temperature on Microstructural Properties of an Industrially Forged UNS S32750/1.4410/F53 Super Duplex Stainless Steel (SDSS) Alloy

Cojocaru

Şerban

Angelescu

et al. 2017

Metals

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Abstract:In this present study, the influence of solution annealing temperature on microstructural properties of a forged Super Duplex Stainless Steel (SDSS) was investigated by SEM-BSE (Scanning Electron Microscopy-Backscattered Electrons) and SEM-EBSD (Scanning Electron Microscopy-Electron Backscatter Diffraction) techniques. A brief solution treatment was applied to the forged super duplex alloy, at different temperatures between 800 • C and 1100 • C, with a constant holding time of 0.6 ks (10 min). Microstructural characteristics such as nature, weight fraction, distribution and morphology of constituent phases, average grain-size and grain misorientation were analysed in relation to the solution annealing temperature. Experimental results have shown that the constituent phases in the SDSS alloy are δ-Fe, γ-Fe and σ (Cr-Fe) and that their properties are influenced by the solution treatment temperature. SEM examinations revealed microstructural modifications induced by the Cr rich precipitates along the δ/γ and δ/δ grain boundaries, which may significantly affect the toughness and the corrosion resistance of the alloy. Solution annealing at 1100 • C led to complete dissolution of σ (Cr-Fe) phase, the microstructure being formed of primary δ-Fe and γ-Fe. The orientation relationship between δ/δ, γ/γ and δ/γ grains was determined by electron back scattering diffraction (EBSD). Both primary constituent phase's microhardness and global microhardness were determined.

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“…Duplex and Super Duplex Stainless Steels (DSS and SDSS) are characterised by a biphasic austenitic/ferritic microstructure (with approximately equal parts of austenite and ferrite) which ensures higher mechanical properties and stress corrosion resistance than conventional austenitic stainless steels [1]. The difference between DSS and SDSS can be resumed by the Pitting Resistance Equivalent Number (PREN), which is a function of the chemical composition of the alloy: alloys with a PREN of 40 or greater are classed as SDSS, while those with a PREN of less than 40 are classed as DSS.…”

Section: Introductionmentioning

confidence: 99%

Determination of interfacial heat transfer coefficients in a sand mould casting process using an optimised inverse analysis

Palumbo

Piglionico

Piccininni

et al. 2015

Applied Thermal Engineering

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Investigation of stress corrosion cracks in a UNS S32750 superduplex stainless steel

Cited by 35 publications

References 12 publications

Effect of short duration solution treatment at temperatures below 1000 °C on σ‐phase precipitation in a super duplex stainless steel alloy

Effect of short duration solution treatment at temperatures below 1000 °C on σ‐phase precipitation in a super duplex stainless steel alloy

Influence of Solution Treatment Temperature on Microstructural Properties of an Industrially Forged UNS S32750/1.4410/F53 Super Duplex Stainless Steel (SDSS) Alloy

Determination of interfacial heat transfer coefficients in a sand mould casting process using an optimised inverse analysis

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