Microstructure of 2205 duplex stainless steel joint in submerged arc welding by post weld heat treatment

Luo, Jian; Dong, Yaling; Li, Longfei; Wang, Xiaoming

doi:10.1016/j.jmapro.2013.06.013

Cited by 61 publications

(23 citation statements)

References 9 publications

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“…In order to solve these problems, it is important to investigate post-heat treatment process to control the content of delta ferrite and the harmful carbides [9]. Proper post-heat treatment can improve the mechanical properties by homogenizing the microstructure of the welded material and controlling the formation of beneficial and harmful phases [10][11][12][13].…”

Section: Methodsmentioning

confidence: 99%

Effect of Post Weld Heat Treatment on the Microstructure and Mechanical Properties of a Submerged-Arc-Welded 304 Stainless Steel

Nam

Kim

et al. 2018

Metals

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Abstract:The present study is to investigate the effect of post heat treatment on the microstructures and mechanical properties of a submerged-arc-welded 304 stainless steel. The base material consisted of austenite and long strips of delta-ferrite surrounded by Cr-carbide, and the welds consisted of delta ferrite and austenite matrix. For the heat treatment at 850 • C or lower, Cr-carbides were precipitated in the weld metal resulting in the reduction of elongation. The strength, however, was slightly reduced despite the presence of Cr-carbides and this could possibly be explained by the relaxation of internal stress and the weakening of particle hardening. In the heat treatment at 1050 • C, the dissolution of Cr-carbide and disappearance of delta ferrite resulted in the lower yield strength and higher elongation partially assisted from deformation-induced martensitic transformation. Consequently, superior property in terms of fracture toughness was achieved by the heat treatment at 1050 • C, suggesting that the mechanical properties of the as-weld metal can be enhanced by controlling the post weld heat treatment.

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Section: Methodsmentioning

confidence: 99%

Effect of Post Weld Heat Treatment on the Microstructure and Mechanical Properties of a Submerged-Arc-Welded 304 Stainless Steel

Nam

Kim

et al. 2018

Metals

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“…Moreover, they show higher toughness and plasticity than martensitic steels [1][2][3][4][5]. Due to their unique properties, these stainless steels present some advantages with respect to monophase stainless steels [6] and have many applications in different sectors such as the food, petrochemical, oil&gas and marine industries.…”

Section: Introductionmentioning

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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“…J. Lou et al applied in 2205 DSS welds a post weld heat treatment in which their observations conducted to evidence some changes of second phases, segregation and element diffusion improving the microstructure of the heat affected zone (HAZ) of the SAW joints. However, these segregations produced a reduction of the mechanical properties and performance in the DSS joints [14].…”

Section: Detrimental Cr-rich Phases Precipitation On Saf 2205 Duplex mentioning

confidence: 99%

Detrimental Cr-rich Phases Precipitation on SAF 2205 Duplex Stainless Steels Welds After Heat Treatment

Pérez¹,

Breda

Calliari

et al. 2016

Soldag. insp.

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Abstract:The austeno-ferritic Stainless Steels are commonly employed in various applications requiring structural performances with enhanced corrosion resistance. Their characteristics can be worsened if the material is exposed to thermal cycles, since the high-temperature decomposition of ferrite causes the formation of detrimental secondary phases. The Submerged Arc Welding (SAW) process is currently adopted for joining DSS owing to its relatively simple execution, cost savings, and using molten slag and granular flux from protecting the seam of atmospheric gases. However, since it produces high contents of δ-ferrite in the heat affected zone and low content of γ-austenite in the weld, high-Ni filler materials must be employed, to avoid excessive ferritization of the joint. The present work is aimed to study the effect of 3 and 6 hours isothermal heat treatments at 850°C and 900°C in a SAF 2205 DSS welded joint in terms of phases precipitation. The results showed the presence of σ-phase at any time-temperature combination, precipitating at the δ/γ interphases and often accompanied by the presence of χ-phase. However, certain differences in secondary phases amounts were revealed among the different zones constituting the joint, ascribable both to peculiar elements partitioning and to the different morphology pertaining to each microstructure. Key-words:Duplex Stainless Steels; SAW; Heat treatment; Sigma; Chi. Precipitação de Fases Prejudiciais Ricas em Cromo em Soldas de Aço Inoxidável Duplex SAF 2205 Após Tratamento TérmicoResumo: Os Aços Inoxidáveis austeno-ferriticos são comumente utilizados em diversas aplicações que requerem desempenho estrutural, maior resistência à corrosão. As suas características podem ser prejudicadas se o material for exposto a ciclos térmicos, uma vez que a decomposição a alta temperatura da ferrita provoca a formação de fases secundárias prejudiciais. O processo de soldagem a arco submerso (SAW) é atualmente adotado para unir DSS devido à sua execução relativamente simples, economia de custos, e utiliza escória fundida e fluxo granular para proteger a costura dos gases atmosféricos. No entanto, uma vez que são produzidos elevados teores de ferrita-δ na zona afetada pelo calor e baixo teor de austenita-γ na solda, materiais de adição de alto-Ni devem ser empregados, de modo a evitar excessiva ferritização na junta. O presente trabalho tem como objetivo estudar o efeito de 3 e 6 horas de tratamentos térmicos isotérmicos a 850°C e 900°C em uma junta soldada de DSS SAF 2205 em termos de precipitação de fases. Os resultados mostraram a presença de fase-σ em qualquer combinação de tempo-temperatura, precipitando nas interfases δ/γ e muitas vezes acompanhada pela presença de fase-χ. No entanto, algumas diferenças na quantidade de fases secundárias foram reveladas nas diferentes zonas que constituem a junta, ambas atribuídas aos elementos peculiares de partição e à morfologia diferente pertencente a cada microestrutura. Palavras-chave:Aços inoxidáveis duplex; SAW; Tratamento térmico; Sigma...

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Microstructure of 2205 duplex stainless steel joint in submerged arc welding by post weld heat treatment

Cited by 61 publications

References 9 publications

Effect of Post Weld Heat Treatment on the Microstructure and Mechanical Properties of a Submerged-Arc-Welded 304 Stainless Steel

Effect of Post Weld Heat Treatment on the Microstructure and Mechanical Properties of a Submerged-Arc-Welded 304 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

Detrimental Cr-rich Phases Precipitation on SAF 2205 Duplex Stainless Steels Welds After Heat Treatment

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