Effect of post-weld heat treatment on microstructure evolution and pitting corrosion behavior of UNS S31803 duplex stainless steel welds

Zhang, Z.; Wang, Zhiyu; Jiang, Yiming; Tan, Hua; Han, Di; Guo, Yanjun; Jin, Li

doi:10.1016/j.corsci.2012.04.047

Cited by 147 publications

(59 citation statements)

References 35 publications

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“…After PWHT (Figure 4f), the microstructure becomes finer and smoother, characterized by an increased amount of austenite. This microstructure is in agreement with the results of Zhang et al [9]. In order to consider the change in the chemical analysis induced by the addition of nickel powder, EDS analysis was performed on the fusion zone of different samples.…”

Section: Microstructuresupporting

confidence: 76%

“…It was reported that PWHT leads to an improvement in corrosion resistance and avoids the formation of brittle intermetallic compounds by precisely controlling the annealing temperature and the cooling rate. Generally, a high annealing temperature followed by water quenching reduces the risk of formation in the intermetallic phases [9,10]. Badji et al [1] investigated the effect of the annealing temperature on the phase percentages after welding.…”

Section: Effect Of the Addition Of Nickel Powder And Post Weld Heat Tmentioning

confidence: 99%

“…Normally, fusion-welding processes can cause damage to the equal percentage of the ferrite and austenite phases, which is responsible for their good engineering properties [7,8]. Many authors have studied different solutions to restore the equal percentages of the ferrite and austenite phases as well as solutions to avoid precipitation of the detrimental intermetallic compounds such as the sigma (σ), chi (χ) and nitride phases after the welding processes [9,10]; the critical temperatures for the formation of these phases are between 650 and 900 °C. Lippold and Koseki [11] suggested limiting the heat input during welding of the duplex stainless steels in the range of 0.5-2.0 kJ/mm, so that formation and precipitation of the deleterious intermetallic phases can be avoided [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Addition of Nickel Powder and Post Weld Heat Treatment on the Metallurgical and Mechanical Properties of the Welded UNS S32304 Duplex Stainless Steel

Tahaei

Pérez²,

Merlin

et al. 2016

Soldag. insp.

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In this research, the effect of the addition of nickel powder and the application of a post weld heat treatment (PWHT) on the welding properties of the UNS S32304 lean duplex stainless steel were investigated in order to improve the microstructure and mechanical properties. Nickel powder was directly poured inside the joint gap and mixed with the filler metal during the Gas Tungsten Arc Welding (GTAW) process; moreover, the solution heat treatment was performed at 1100 °C for 10 min. The joints were characterized by optical microscopy (OM) and the evolution of the phase percentages in the different zones was studied by means of the image analysis technique. Tensile and hardness tests were carried out on the joints in order to evaluate the improvement of the mechanical properties. The results showed that both the addition of nickel powder during the welding process and the post weld heat treatment made it possible to improve the mechanical properties of the weld joints. PWHT had the best effect in restoring the equal percentage of ferrite and austenite compared to the addition of nickel powder. Key-words:Duplex stainless steel; GTAW process; Nickel powder; PWHT; Microstructure. Efeito da Adição de Pó de Níquel e do Tratamento Pós Soldagem nas Propriedades Metalúrgicas do Aço Inoxidável Duplex UNS S32304 SoldadoResumo: No presente estudo, foi investigado o efeito da adição de pó de níquel e a aplicação de um tratamento térmico pós-soldagem (PWHT) nas propriedades de soldagem do aço inoxidável lean duplex UNS S32304, a fim de melhorar a microestrutura e as propriedades mecânicas. Pó de níquel foi diretamente vertido na abertura da junta e misturado com o metal de adição durante o processo de soldagem a arco com eletrodo de tungsténio e proteção gasosa (GTAW). Além disso, o tratamento térmico foi estabelecido em 1100 °C por 10 min. As juntas foram caracterizadas por microscopia óptica (MO) e a evolução das percentagens de fase nas diferentes zonas foi estudada por meio da técnica de análise de imagem. Os ensaios de tração e de microdureza foram realizados, a fim de avaliar a melhoria das propriedades mecânicas das juntas. Os resultados mostraram que tanto a adição de pó de níquel durante o processo de soldagem e o tratamento térmico pós-soldagem permitiram melhorar as propriedades mecânicas da junta soldada. PWHT mostrou o melhor efeito em restaurar a percentagem igual de ferrita e austenita comparado com a adição de pó de níquel. Palavras-chave:Aços Inoxidáveis Duplex; GTAW; Pó de níquel; PWHT; Microestrutura.

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Section: Microstructuresupporting

confidence: 76%

Section: Effect Of the Addition Of Nickel Powder And Post Weld Heat Tmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of the Addition of Nickel Powder and Post Weld Heat Treatment on the Metallurgical and Mechanical Properties of the Welded UNS S32304 Duplex Stainless Steel

Tahaei

Pérez²,

Merlin

et al. 2016

Soldag. insp.

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“…These precipitates resulted in depletion in Cr in the adjacent matrix region. The chromium-depleted zones provide a favorable site for pitting corrosion nucleation, as reported by several authors 6,8,9,14,20,23,[28][29][30][31][32] .…”

Section: Electrochemical Behaviorsupporting

confidence: 52%

Cyclic Polarization Study of Thick Welded Joints of Lean Duplex Stainless Steel for Application in Biodiesel Industry

et al. 2016

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Thick welded joints of UNS S32304 lean duplex stainless steel (LDSS) has been studied in acidified glycerin, a byproduct of biodiesel plants, using cyclic polarization technique. LDSS S32304 thick plates were welded by different processes commonly employed in the fabrication process: shielded metal arc welding, gas metal arc welding and flux cored arc welding. The electrochemical behavior of different weldment zones was characterized. Transmission electron microscopy and scanning electron microscopy (SEM) were used for sample characterization. SEM images showed that the heat affected zone was the most critical zone for pitting corrosion for all samples. The results were associated to the microstructural features of the materials. Generally, the breakdown potential of the top regions of welds was higher in acidified glycerin than the weld root for welds fabricated with two different filler metals. Basically, all the welded samples exhibited similar or higher corrosion resistance, compared with the corresponding base metal.

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“…Micro-cracks, fracture and dislocation morphology in the weld zone were analyzed by scanning electron microscope, electron probe microanalyzer and transmission electron microscopy. Zhang et al [10] investigated the effect of tungsten inert gas welding and subsequent post-weld heat treatment on the microstructure evolution and pitting corrosion behavior of duplex stainless steel. However, these publications don't mention the geometrical parameters of the weld surface morphology.…”

Section: Introductionmentioning

confidence: 99%

Influence of argon pollution on the weld surface morphology

et al. 2015

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SummaryIn this paper the surfaces of butt welded joints in steel tubes were analyzed using an optical 3D measurement system to determine the morphology and topographic parameters. It was established that pollution of the argon shield gas with oxygen did not influence the width of the heat-affected zone. However, the composition of the shield gas significantly influenced the surface asymmetry, Ssk, and its inclination Sku. The measurement of these parameters enabled the selection of a higher quality surface, which was visually proven by the reduction in discoloration of the surface of the weld joint. High quality surfaces eliminate a potential habitat for bacteria and a future source of corrosion as well as providing less resistance to fluid flow.

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Effect of post-weld heat treatment on microstructure evolution and pitting corrosion behavior of UNS S31803 duplex stainless steel welds

Cited by 147 publications

References 35 publications

Effect of the Addition of Nickel Powder and Post Weld Heat Treatment on the Metallurgical and Mechanical Properties of the Welded UNS S32304 Duplex Stainless Steel

Effect of the Addition of Nickel Powder and Post Weld Heat Treatment on the Metallurgical and Mechanical Properties of the Welded UNS S32304 Duplex Stainless Steel

Cyclic Polarization Study of Thick Welded Joints of Lean Duplex Stainless Steel for Application in Biodiesel Industry

Influence of argon pollution on the weld surface morphology

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