Resistência à Corrosão de Juntas Dissimilares dos Aços AISI 316L e da Liga Inconel 718

Silva, Gianne Moreira da; Ferreira, Elivelton Alves; Castro, José Adilson de

doi:10.1590/0104-9224/si24.22

Cited by 2 publications

(1 citation statement)

References 14 publications

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“…Henderson et al [9] reported the use of dissimilar joints of AISI 316L and Inconel 718 in industrial gas turbine engines. Silva et al [10] studied the corrosion resistance of dissimilar joints of Inconel 718 and AISI 316L welded by GTAW process under different heat inputs and concluded that Inconel 718 and the fusion zone (FZ) have good resistance to pitting corrosion, although in the region close to AISI 316L steel may suffer localized corrosion. Gomes et al [11], using the Hole-Drilling technique, analyzed the presence of residual stresses in dissimilar joints of AISI 316L and Inconel 718, concluding that the interface between the base metal and heat-affected zone (HAZ) of each metal presented residual stress around 300 MPa.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Dissimilar Welding Joint between Inconel 718 and AISI 316L by GTAW Multipass Process

et al. 2022

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AISI 316L steel and Inconel 718 are metals of wide application in industries. The study of dissimilar welding between these two materials is technologically important to improve their joint performance. We focused this study on the evaluation of the dissimilar weldability of these materials. Three samples of AISI 316L and Inconel 718 welded using a multipass GTAW (Gas Tungsten Arc Welding) process with different parameters were analyzed. The microstructural characterization, measurements of the volumetric fraction of the δ ferrite and Laves phase, the spacing between austenite dendrites, in addition to measurement and analysis of dimensions of the welding zones and the microhardness were performed. The measurement of the weld metal dimensions and the dendrite spacing showed that higher heat inputs increased the dilution zones and the spacing between austenite dendrites. The volumetric fraction of the δ ferrite decreased with the increase of heat input, while the Laves phase fraction increased. The microhardness presented significant variation in the weld pool due to changes in the phases and composition, as evidenced by EDS analysis in the dissimilar joints.

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Section: Introductionmentioning

confidence: 99%

Analysis of Dissimilar Welding Joint between Inconel 718 and AISI 316L by GTAW Multipass Process

et al. 2022

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Mechanical and Microstructural Characterization of TIG Welded Dissimilar Joints between 304L Austenitic Stainless Steel and Incoloy 800HT Nickel Alloy

Rogalski

Świerczyńska

Landowski

et al. 2020

Metals

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In this article, the mechanical properties and microstructure of 304L austenitic stainless steel/Incoloy 800HT nickel alloy dissimilar welded joints are investigated. The joints were made of 21.3 mm × 7.47 mm tubes using the TIG process with the use of S Ni 6082 nickel filler metal. No welding imperfections were found and high strength properties of joints were obtained, meeting the assumed acceptance criteria of the product’s standards. The tensile strength of the welded joints was higher than for the joined materials (Incoloy 800HT). Macro- and microscopic metallographic tests revealed the correct morphology of the joints and the appropriate structures in their critical zones. However, differences were found in the morphologies of the zones between the weld and the base materials. In fusion boundary from the side of the Incoloy 800HT alloy, no clear outline of the fusion line was observed (type A fusion boundary), while increased grain size and an epitaxial structure were observed. In turn, in the zone: weld–304L steel, a distinct fusion line was observed with areas with an increased amount of high-temperature δ ferrite (type B fusion boundary). No precipitates were found that could reduce the resistance of the joints to intergranular corrosion. A hardness decrease (approximately 30 HV0.1) in the transition zone: austenitic steel–weld and an increase of hardness (approximately 10 HV0.1) on the opposite side of the welded joint were observed.

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Resistência à Corrosão de Juntas Dissimilares dos Aços AISI 316L e da Liga Inconel 718

Cited by 2 publications

References 14 publications

Analysis of Dissimilar Welding Joint between Inconel 718 and AISI 316L by GTAW Multipass Process

Analysis of Dissimilar Welding Joint between Inconel 718 and AISI 316L by GTAW Multipass Process

Mechanical and Microstructural Characterization of TIG Welded Dissimilar Joints between 304L Austenitic Stainless Steel and Incoloy 800HT Nickel Alloy

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