Assessment of Stress Corrosion Cracking Resistance of Activated Tungsten Inert Gas-Welded Duplex Stainless Steel Joints

Alwin, B.; Lakshminarayanan, A.K.; Vasudevan, M.; Vasantharaja, P.

doi:10.1007/s11665-017-3057-0

Cited by 15 publications

(5 citation statements)

References 37 publications

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“…Alwin et al showed that base metal exhibited higher SCC resistance as compared to TIG and ATIG weld joints of AISI 2205 grade duplex SS. They attributed better SCC resistance of base metal to finer grains (40 µm) and duplex microstructure of 2205 grade SS as compared to welds joints [26].…”

Section: Resultsmentioning

confidence: 99%

SCC behaviour of laser and hybrid laser welded stainless steel weld joints

Ragavendran

Toppo

Vasudevan

2022

Materials Science and Technology

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In this study, stress corrosion cracking (SCC) resistance was evaluated for type 316LN stainless steel weld joints fabricated by advanced welding techniques such as Laser, Hybrid Laser – Tungsten inert gas (HLT) and Hybrid Laser – Metal inert gas (HLM) welding. 316 LN stainless steel base metal exhibited significantly better resistance to SCC. The solidification mode, secondary dendritic arm spacing (SDAS) and tensile residual stress distribution in the weld metal was found to strongly influence SCC resistance of 316LN stainless steel weld joints. The weld joint processed by HLM process exhibited the highest time to failure during SCC testing and hence better SCC resistance due to primary ferritic mode of solidification, finer SDAS and lower width of tensile residual stress distribution.

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Section: Resultsmentioning

confidence: 99%

SCC behaviour of laser and hybrid laser welded stainless steel weld joints

Ragavendran

Toppo

Vasudevan

2022

Materials Science and Technology

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“…However, in interlayer-based case no sensitization was noticed. These zero sensitization of interlayer-based weldment could be due to the fully austenitic microstructure in the WZ [7,56], also, FCC phase is more thermodynamically stable.…”

Section: Intergranular Corrosion (Igc) Testmentioning

confidence: 99%

Influence of inconel interlayer on microstructural, mechanical and electrochemical characteristics in single-pass ATIG welding of dissimilar austenitic and duplex stainless steel

Fande,

Kavishwar,

Tandon

et al. 2024

Mater. Res. Express

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This study investigates the impact of Inconel 625 interlayer on dissimilar welded low nickel austenitic stainless steel (LNiASS) and super duplex stainless steel (S32760) using activated tungsten inert gas (ATIG) welding. Two weldments were prepared: with and without (autogenous) interlayer. Geometrical investigation of the weld cross sections revealed that interlayer-based welding significantly increased the depth of penetration and decreased weld width as compared to autogenous welding at the same welding current. The dual microstructure was observed in the weld zone (WZ) of autogenous weldment while a fully austenitic structure with few intermetallics was observed in the WZ of interlayer-based weldment. Mechanical properties, particularly impact strength observed to be improved in the case of interlayer-based weldment (91±2 J) compared to autogenous weldment (68±2 J). Lower microhardness was noticed for the WZ of interlayer-based weldment (258±3 HV0.2) than WZ of autogenous (279±2 HV0.2) weldment due to the presence of higher content of Ni. However, the ultimate tensile strength of interlayer-based weldment (654 MPa), falls short in comparison to the autogenous weldment (693 MPa), indicating a compromised joint efficiency of 5.96%. The corrosion resistance was observed to be higher for the WZ of interlayer-based weldment attributed to the higher content of Ni and Mo. The sensitization study revealed a 47.33% degree of sensitization in the WZ of autogenous weldments due to dual microstructure, while interlayer-based weldments showed no sensitization.

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“…In addition, the specimen exposed to 8 wt.% Clhad a higher υ crack by the failure with 5.27 × 10 -9 m/s compared with the 3.25 × 10 -9 m/s of the 4 wt.% Cl -. The rise in the υ crack is related to the increase in cleavage facet surface over the microvoids/dimple surface, denoting a more brittle rupture, due to the α-phase (ferrite cleavage facets) needing less energy to crack than the γ-phase [48]. The loss in toughness (area over the stress/strain curve from the σ y to failure) is because of the α-phase prematurely cracking with the increase in chloride content rising over the chloride threshold of the α-phase [49].…”

Section: Crack Propagation Ratementioning

confidence: 99%

Stress Corrosion Cracking Mechanisms of UNS S32205 Duplex Stainless Steel in Carbonated Solution Induced by Chlorides

Martin

Bastidas

2023

Metals

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Herein, the chloride-induced stress corrosion cracking (SCC) mechanisms of UNS S32205 duplex stainless steel (DSS) reinforcing bars in alkaline and carbonated solutions are studied. Electrochemical monitoring and mechanical properties were tested using linear polarization resistance and electrochemical impedance spectroscopy, coupled with the slow strain rate tensile test (SSRT) to evaluate the SCC behavior and unravel the pit-to-crack mechanisms. Pit initiation and crack morphology were identified by fractographic analysis, which revealed the transgranular (TG) SCC mechanism. HCO3− acidification enhanced the anodic dissolution kinetics, thus promoting a premature pit-to-crack transition, seen by the decrease in the maximum phase angle in the Bode plot at low frequencies (≈ 1 Hz) for the carbonated solution. The crack propagation rate for the carbonated solution increased by over 100% compared to the alkaline solution, coinciding with the lower phase angle from the Bode plots, as well as with the lower charge transfer resistance. Pit initiation was found at the TiN nonmetallic inclusion inside the ferrite phase cleavage facet, which developed TG-SCC.

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Assessment of Stress Corrosion Cracking Resistance of Activated Tungsten Inert Gas-Welded Duplex Stainless Steel Joints

Cited by 15 publications

References 37 publications

SCC behaviour of laser and hybrid laser welded stainless steel weld joints

SCC behaviour of laser and hybrid laser welded stainless steel weld joints

Influence of inconel interlayer on microstructural, mechanical and electrochemical characteristics in single-pass ATIG welding of dissimilar austenitic and duplex stainless steel

Stress Corrosion Cracking Mechanisms of UNS S32205 Duplex Stainless Steel in Carbonated Solution Induced by Chlorides

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