Effects of Cooling Time and Alloying Elements on the Microstructure of the Gleeble-Simulated Heat-Affected Zone of 22% Cr Duplex Stainless Steels

Hsieh, Rong-Iuan; Liou, Horng-Yih; Pan, Yaohua

doi:10.1361/105994901770344665

Cited by 84 publications

(41 citation statements)

References 5 publications

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“…The Cr and Mo contents are diluted by an increase in the δ volume fraction, so Cr and Mo content of ferrite phase in the HAZ is lower than in the parent metal and, also, Cr 2 N precipitated in the ferrite phase due to the lower solubility of nitrogen in ferrite 6,8,9,14,20,23, 28-32 . According to Hsieh et al 18 the reformation of austenite in HAZ is limited with nitrogen and nickel contents lower than 0.15 and 5.5% (as the studied UNS S32304), respectively, even in the cases of increased cooling time 18 . According to Hsieh et al 18 the austenite content in the HAZ cannot fall below 25% in order to avoid precipitation of Cr 2 N and guarantee superior pitting corrosion resistance at the HAZ.…”

Section: Electrochemical Behaviormentioning

confidence: 92%

“…According to Hsieh et al 18 the reformation of austenite in HAZ is limited with nitrogen and nickel contents lower than 0.15 and 5.5% (as the studied UNS S32304), respectively, even in the cases of increased cooling time 18 . According to Hsieh et al 18 the austenite content in the HAZ cannot fall below 25% in order to avoid precipitation of Cr 2 N and guarantee superior pitting corrosion resistance at the HAZ. The pits showed in Figure 6 were believed to be related to the Cr 2 N precipitates.…”

Section: Electrochemical Behaviormentioning

confidence: 92%

“…A great number of investigations have studied the effect of alloying elements on corrosion resistance of stainless steels, especially N, which is most effective 6,8,13,16,17 . According to Hsieh et al 18 , a higher content of nitrogen and nickel favors the reformation of austenite. However, the effect of the nitrogen on the reformation of austenite is much greater than that of nickel.…”

Section: Introductionmentioning

confidence: 99%

“…However, the effect of the nitrogen on the reformation of austenite is much greater than that of nickel. Hsieh et al 18 also showed that the effect of manganese on the formation of austenite can be negligible. Bhatt et al 19 found that the presence of 5 and 10% nitrogen in the shielding gas, decreases the ferrite contents to 35 and 29%, respectively, resulting in an improved pitting corrosion resistance of the weldments obtained by gas tungsten arc.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Electrochemical Behaviormentioning

confidence: 92%

Section: Electrochemical Behaviormentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2016

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“…In addition, based on the results of the base metal before and after PWHT, it is clear that the percentage of austenite phase increases after PWHT and that the amount of both phases becomes roughly equal (48%Ferrite-52%Austenite). This means that appropriate results were obtained, because for most industrial applications and piping inspection procedures, austenite contents lower than 25-30% are considered unacceptable [24][25][26]. Moreover, according to Hagen [27], the optimum percentage of austenite required to reach an appropriate combination of corrosion resistance and mechanical properties should be in the range of 40 and 60%.…”

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

confidence: 99%

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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Continuous Casting Simulation of 2304 Duplex Stainless Steel Via Horizontal Directional Solidification Technique

et al. 2012

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Effects of Cooling Time and Alloying Elements on the Microstructure of the Gleeble-Simulated Heat-Affected Zone of 22% Cr Duplex Stainless Steels

Cited by 84 publications

References 5 publications

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

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

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

Continuous Casting Simulation of 2304 Duplex Stainless Steel Via Horizontal Directional Solidification Technique

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