The high-temperature performance of nickel-based transition joints

Parker, J.D.; Stratford, Gavin C.

doi:10.1016/s0921-5093(00)01374-5

Cited by 18 publications

(15 citation statements)

References 6 publications

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“…It is now recognised 12,13,17,[31][32][33] that two distinct carbide morphologies will evolve in DMWs during aging. Examples of these are shown in Fig.…”

Section: Microstructural Evolution During Aging and Post-weld Heat Tr...mentioning

confidence: 99%

“…As discussed in more detail in the next section, examinations of service and laboratory induced failures 12,13,17,[31][32][33][34] have shown that premature failure of DMWs made with Ni base filler metals is associated with formation of creep cavities around the type I carbides. Thus, the nucleation, growth and morphological changes that occur in type I carbides have received considerable attention, and several kinetic studies have been reported.…”

Section: Microstructural Evolution During Aging and Post-weld Heat Tr...mentioning

confidence: 99%

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Microstructural evolution and high temperature failure of ferritic to austenitic dissimilar welds

DuPont

2012

International Materials Reviews

131

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Dissimilar metal welds between ferritic and austenitic alloys are used extensively in power plants.Premature failure of such welds can occur below the expected creep life of either base metal. This article reviews microstructural evolution in dissimilar welds and describes factors that contribute to premature failure. The microstructure in the as welded condition consists of a sharp chemical concentration gradient across the fusion line. Martensite forms within this gradient due to high hardenability and rapid cooling rates from welding. Upon aging, carbon diffuses down the chemical potential gradient from the ferritic steel toward the austenitic alloy. This can lead to formation of a soft carbon denuded zone in the ferritic steel, and nucleation and growth of carbides in the austenitic steel that produce high hardness. These differences in microstructure and hardness occur over distances of about 50-100 mm. Failure is attributed to the steep microstructural and mechanical property gradients, the large difference in coefficient of thermal expansion, formation of interfacial carbides that promote creep cavity formation, and preferential oxidation of the ferritic steel. Information is also provided on available creep rupture properties, remaining life estimation techniques, current best practices and research in progress.

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“…It is now recognised 12,13,17,[31][32][33] that two distinct carbide morphologies will evolve in DMWs during aging. Examples of these are shown in Fig.…”

Section: Microstructural Evolution During Aging and Post-weld Heat Tr...mentioning

confidence: 99%

Section: Microstructural Evolution During Aging and Post-weld Heat Tr...mentioning

confidence: 99%

Microstructural evolution and high temperature failure of ferritic to austenitic dissimilar welds

DuPont

2012

International Materials Reviews

131

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“…Shojaati and Beidokhti [ 8 ] studied the effect of filler wires such as NiCr 80, austenitic, and duplex stainless steel on the mechanical properties and microstructures of dissimilar GMAW of SS304 and SS409. They discovered that austenitic stainless steel fillers resulted in a ferrite-austenite solidification mode, while Ni-based fillers decreased carbon segregation and reduced the diffusion rate of carbon [ 9 ]. The lower carbon diffusion rate in Ni-based filler metals results in improved weld quality and mechanical properties, making it a major advantage in welding applications where carbon presence can negatively impact the weld joint performance [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Filler Material on the Microstructural and Mechanical Properties of 430 Ferritic Stainless Steel Weld Joints

Shanmugasundar¹,

Bansod

Schindlerová

et al. 2023

Materials

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Tungsten Inert Gas (TIG) welding is a commonly used welding technique for ferritic stainless steel, due to its ability to produce high-quality, clean, and precise welds. This welding method provides excellent control over the heat input, making it suitable for thin-walled, high-alloy materials such as ferritic stainless steel. The purpose of this study was to investigate the effect of using two different filler materials, 310 (austenitic) and 410 (ferritic), on the microstructural and mechanical properties of Tungsten Inert Gas (TIG) weld butt joints of 430 ferritic stainless steel (FSS). The results showed that the choice of filler material significantly impacted the dilution percentage, the chromium-nickel equivalent ratio, microstructure, microhardness, and tensile characteristics of the welded joint. The use of 310 filler resulted in a columnar microstructure, whereas the use of 410 filler resulted in a ferritic (acicular ferrite) microstructure with the presence of martensite and austenite. The sample welded with 410 filler demonstrated superior mechanical properties compared to the sample welded with 310 filler. These findings emphasize the importance of selecting the appropriate filler material in order to achieve the desired microstructural and mechanical properties in 430 FSS welded joints.

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“…The main reason for deteriorated creep strength was attributed to the formation of soft carbon-depleted zone at the bainitic side of the weld metal interface due to the carbon migration from bainitic steel to austenitic weld metal, driven by carbon activity gradient [6]. To overcome this problem, the alternative Ni-based welding consumables of Inconel-type have been introduced [1,[7][8][9]. The main benefit of the Ni-based filler materials comes from their low carbon solubility, so they act like a carbon diffusion barrier.…”

Section: Introductionmentioning

confidence: 99%

“…The majority of published studies on the dissimilar welded joints with Ni-based weld metal was focused on the welds with 2.25Cr-1Mo bainitic steel base material [7][8][9][10][11]. The literature information about dissimilar weldments between the 9%Cr martensitic steels and austenitic creep-resistant steels is rather limited [12][13][14] and about their creep deformation and fracture behavior even missing.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and creep characteristics of dissimilar T91/TP316H martensitic/austenitic welded joint with Ni-based weld metal

Falat

Svoboda

Výrostková

et al. 2012

Materials Characterization

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The high-temperature performance of nickel-based transition joints

Cited by 18 publications

References 6 publications

Microstructural evolution and high temperature failure of ferritic to austenitic dissimilar welds

Microstructural evolution and high temperature failure of ferritic to austenitic dissimilar welds

Influence of Filler Material on the Microstructural and Mechanical Properties of 430 Ferritic Stainless Steel Weld Joints

Microstructure and creep characteristics of dissimilar T91/TP316H martensitic/austenitic welded joint with Ni-based weld metal

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