Influence of the microstructure on the plastic behaviour of duplex stainless steels

Jorge, Alberto Moreira; Reis, Gedeon Silva; Balancin, Oscar

doi:10.1016/j.msea.2010.11.087

Cited by 40 publications

(16 citation statements)

References 15 publications

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“…The superduplex stainless steels (SDSS) depict a microstructure composed of austenite (γ) and ferrite (δ), normally with a 1:1 ratio [1][2][3] . The formation of these two phases is determined by the preferential partitioning of the alloying elements, ferrite, and austenite phases, especially the Cr, Ni and Mo 4 . Cr and Mo enrich ferrite, while Ni and N are concentrated in austenite 5,6 .…”

Section: Introductionmentioning

confidence: 99%

Microstructural Evolution Due to One Thermal Cycle in a Superduplex Stainless Steel ASTM A890/A890M - Grade 6A in the As-Weld and Post-Weld Heat Treatment Conditions

et al. 2019

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During welding of the superduplex stainless steels are exposed to thermal cycles, allowing precipitation of deleterious phases as well as unbalance as the ferrite and austenite phases. This work analyzed the microstructural changes taking place on a plate ASTM A890/A890M-grade 6A steel submitted to arc welding one welding of pass conducted on a flat surface using coated electrode Zeron®100, in the as welded and post-welded heat treatment conditions. Microstructural characterization in the regions base metal, heat affected zone, and fusion zone were conducted by optical microscopy, scanning electron microscopy and X-ray diffraction. The post-weld heat treatment in the fusion zone changed the ferrite/austenite volumetric fraction from 59/41 to 52/48. Cr, Mo and Ni distributions in the fusion zone were altered after the post-weld heat treatment, with the concentration ratio ferrite/ austenite being around 1.0; 1.1 and 0.9 to 1.1; 1.4 and 0.7, respectively. In addition, hardness reduced from 300 to 270 HV 0.3 at the fusion zone.

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Section: Introductionmentioning

confidence: 99%

Microstructural Evolution Due to One Thermal Cycle in a Superduplex Stainless Steel ASTM A890/A890M - Grade 6A in the As-Weld and Post-Weld Heat Treatment Conditions

et al. 2019

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“…A variety of duplex stainless steels (DSSs) with approximately equal parts of austenite and ferrite in its annealed structure have been developed through alloying with 21 wt % to 29 wt % Cr, 1 wt % to 7 wt % Ni, and up to 4.5 wt % Mo and other elements such as Mn, W, and Cu balanced with Fe [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. The DSSs have, in general, better resistance to localized corrosion and stress corrosion cracking (SCC) than single-phase austenitic or ferritic stainless steels [ 1 , 3 , 5 , 6 , 7 , 9 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

“…The DSSs have, in general, better resistance to localized corrosion and stress corrosion cracking (SCC) than single-phase austenitic or ferritic stainless steels [ 1 , 3 , 5 , 6 , 7 , 9 , 11 ]. The resistance to crack growth of DSS is also greater than that for single-phase stainless steel, because a crack in DSSs stops growing when it meets the other phase [ 1 , 5 , 6 , 10 , 11 ]. The DSSs are therefore widely used where both high corrosion resistance and excellent mechanical strength are required, such as for chemical tankers, desalination plants, chemical and petrochemical processes, pipelines, and oil and gas separators [ 1 , 5 , 6 , 8 , 9 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Nitrogen and Tensile Direction on Stress Corrosion Cracking Susceptibility of Ni-Free FeCrMnC-Based Duplex Stainless Steels

Lee

et al. 2017

Materials

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Stress corrosion cracking (SCC) behavior of Ni-free duplex stainless steels containing N and C (Febalance-19Cr-8Mn-0.25C-(0.03, 0.21)N, in wt %) was investigated by using a slow strain rate test (SSRT) in air and aqueous NaCl solution with different tensile directions, including parallel (longitudinal) and perpendicular (transverse) to the rolling direction. It was found that alloying N was effective in increasing the resistance to SCC, while it was higher along the longitudinal direction than the transverse direction. The SCC susceptibility of the two alloys was assessed based on the electrochemical resistance to pitting corrosion, the corrosion morphology, and the fractographic analysis.

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“…[1][2][3][4][5][6][7][8] But they have a severe disadvantage in being difficult to hot work. 2,9,10 The DSS microstructure generally consists of around 50 % d-ferrite and 50 % g-austenite, which gives them excellent properties, but also provides for a narrow window in the hot-working process.…”

Section: Introductionmentioning

confidence: 99%

“…During hot working, ferrite and ferritic stainless steels undergo dynamic recovery (DRV), 11 which means that subgrains develop in the microstructure, as is the case for the hot working of duplex stainless steels, 12 while austenite and austenitic stainless steels undergo a high degree of strain hardening and then dynamic recrystallization (DRX). 8 While the austenite is dominated by high-angle grain boundaries (HAB), ferrite shows a substantial amount of subgrain boundaries, i.e., low-angle grain boundaries (LAB). Such a contrasting behaviour of austenite and ferrite phases is due to the different stacking-fault energies of these phases, which imposes different deformation mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Hot tensile testing of SAF 2205 duplex stainless steel

Tehovnik¹,

Žužek²,

Burja³

2016

Mater. Tehnol.

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The changes to the microstructure of the duplex stainless steel SAF 2205 during hot tensile tests were investigated. The dominant restoration mechanisms for ferrite and austenite were dynamic recovery (DRV) and dynamic recrystallization (DRX), respectively. Also, the effect of temperature on the deleterious phase precipitation was investigated. The specimens were tested with hot tensile deformation tests in the temperature range from 800°C to 1100°C. The tensile strength of the investigated steel decreased rapidly in the temperature range from 800°C to 950°C and slowly at the testing temperatures from 1000°C to 1100°C. It was found that SAF 2205 has excellent hot-working properties at temperatures between 950°C and 1100°C. The differences in the mechanical properties of austenite and ferrite along with the precipitation of the s-phase represent the most important restrictions during hot working. Optical microscopy was used for the microstructure-evolution analysis in the duplex stainless steel during the hot tensile tests. Keywords: duplex stainless steel, hot tensile test, microstructural evolution, intermetallic phases, s-phase Preiskovali smo spremembe mikrostrukture dupleks nerjavnega jekla SAF 2205 med vro~imi nateznimi preskusi. Prevladujo~a mehanizma meh~anja v feritu in avstenitu sta bila dinami~na poprava in/ali dinami~na rekristalizacija. V dupleks nerjavnem jeklu je bil raziskan vpliv temperature na izlo~anje {kodljivih faz. Vzorce smo vro~e natezno presku{ali v temperaturnem obmo~ju med 800°C in 1100°C. Natezna trdnost preiskanega jekla se je hitro zni`ala v temperaturnem obmo~ju med 800°C in 950°C ter po~asneje pri temperaturah preskusov med 1000°C in 1100°C. Ugotovili smo, da ima SAF 2205 odli~ne vro~e preoblikovalne lastnosti v temperaturnem obmo~ju med 950°C in 1100°C. Najve~je omejitve pri preoblikovanju predstavljajo razlike v mehanskih lastnostih med avstenitom in feritom ter izlo~anje s-faze. V raziskavi je bila uporabljena opti~na mikroskopija za analizo razvoja mikrostrukture v dupleks nerjavnem jeklu med vro~imi nateznimi preskusi. Klju~ne besede: dupleks nerjavno jeklo, vro~i natezni preskusi, razvoj mikrostrukture, intermetalne faze, s-faza

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Influence of the microstructure on the plastic behaviour of duplex stainless steels

Cited by 40 publications

References 15 publications

Microstructural Evolution Due to One Thermal Cycle in a Superduplex Stainless Steel ASTM A890/A890M - Grade 6A in the As-Weld and Post-Weld Heat Treatment Conditions

Microstructural Evolution Due to One Thermal Cycle in a Superduplex Stainless Steel ASTM A890/A890M - Grade 6A in the As-Weld and Post-Weld Heat Treatment Conditions

Effects of Nitrogen and Tensile Direction on Stress Corrosion Cracking Susceptibility of Ni-Free FeCrMnC-Based Duplex Stainless Steels

Hot tensile testing of SAF 2205 duplex stainless steel

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