Summary of Prior Work on Joining of Oxide Dispersion-Strengthened Alloys

Wright, I.G.; Tatlock, G. J.; Badairy, H.; Cl, Chen

doi:10.2172/969976

Cited by 6 publications

(5 citation statements)

References 21 publications

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“…The formation energies, bulk modulus and shear modulus of the configurations, which shown in supplementary Fig. 1 (12)(13)(14)(15)(16)(17)(18), are listed in Table I. Calculated formation energy of Fe-Al (displacement) is about −1.306 eV which is the smallest.…”

Section: Resultsmentioning

confidence: 99%

“…17) However, high content of aluminum may bring difficulties in welding and manufacturing. 18) Furthermore, a series of study on the radiation behavior of high-chromium-content FeCr and FeCrAl alloys showed that the α and α′ precipitates (induced by irradiation) will reduce the ductility and fracture toughness. [19][20][21][22] As a potential ATFcladding material, FeCrAl alloys' resistant to high temperature oxidation have been developed, mainly focused on adjusting the content of Cr and Al.…”

Section: Introductionmentioning

confidence: 99%

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Defective structures in FeCrAl alloys from first principles calculations

Shi

Song

Liu

et al. 2020

Jpn. J. Appl. Phys.

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The FeCrAl alloy system is well known as a potential candidate material for the accident tolerant fuel (ATF) cladding in the nuclear power industry owing to its high oxidation resistance under irradiation and high-temperature environment. The mechanical properties of FeCrAl alloys with various defects degrade under irradiation condition. In the present work, the structures of FeCrAl alloys with 10 ∼ 15Cr wt% and 5 ∼ 6Al wt% were simulated from the first principles calculations. Mechanical properties were predicted for FeCrAl alloys with different defects and components. Calculated results showed that doping Cr into alloys may improve its mechanical properties. On the other hand, Al was predicted to downgrade the mechanical properties by replacing the Fe atom. The mechanical anisotropies of FeCrAl were researched through Zener’s index and 3D Young’s modulus sketches. Additionally, the investigation on electronic characteristics indicated that an attenuated Fe–Fe interaction and strengthened Fe–Al interactions occur with the addition of Al.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Defective structures in FeCrAl alloys from first principles calculations

Shi

Song

Liu

et al. 2020

Jpn. J. Appl. Phys.

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“…It appears that these processes can induce modification of the metallurgical state, including dynamic recrystallisation, modification in grain orientation or modification in the oxide dispersion. Some rupture in these modified areas is reported [4,11].…”

Section: Introductionmentioning

confidence: 99%

“…If the ODS material transitions to a molten phase during the fabrication route and especially during the assembling step, the nanoscale particles may be reallocated in the matrix and the initial oxide dispersion may be modified. Consequently, solid-state welding processes are promising [3,4].…”

Section: Introductionmentioning

confidence: 99%

Resistance Upset Welding of ODS Steel Fuel Claddings—Evaluation of a Process Parameter Range Based on Metallurgical Observations

Corpace

Monnier

Grall

et al. 2017

Metals

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Abstract:Resistance upset welding is successfully applied to Oxide Dispersion Strengthened (ODS) steel fuel cladding. Due to the strong correlation between the mechanical properties and the microstructure of the ODS steel, this study focuses on the consequences of the welding process on the metallurgical state of the PM2000 ODS steel. A range of process parameters is identified to achieve operative welding. Characterizations of the microstructure are correlated to measurements recorded during the welding process. The thinness of the clad is responsible for a thermal unbalance, leading to a higher temperature reached. Its deformation is important and may lead to a lack of joining between the faying surfaces located on the outer part of the join which can be avoided by increasing the dissipated energy or by limiting the clad stick-out. The deformation and the temperature reached trigger a recrystallization phenomenon in the welded area, usually combined with a modification of the yttrium dispersion, i.e., oxide dispersion, which can damage the long-life resistance of the fuel cladding. The process parameters are optimized to limit the deformation of the clad, preventing the compactness defect and the modification of the nanoscale oxide dispersion.

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“…While this stability underpins the excellent performance of NFAs under extreme conditions, it creates a particularly severe challenge when joining NFA components using techniques that involve melting, such as traditional fusion welding (e.g., arc or laser welding) or transient liquid phase bonding. The Y-Ti-O nano-oxides are not soluble in the liquid phase of the NFA, instead tending to agglomerate together or redistribute to surfaces in the melt region [35][36][37][38][39][40]. Further, excess heat deposited during these techniques creates large thermal gradients in the heat-affected zones (HAZs) of each component that can promote the diffusion and coarsening of otherwise stable microstructures.…”

Section: Introductionmentioning

confidence: 99%

Solid-State Welding of the Nanostructured Ferritic Alloy 14YWT Using a Capacitive Discharge Resistance Welding Technique

Lear

Gigax

Schneider

et al. 2021

Metals

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Joining nanostructured ferritic alloys (NFAs) has proved challenging, as the nano-oxides that provide superior strength, creep resistance, and radiation tolerance at high temperatures tend to agglomerate, redistribute, and coarsen during conventional fusion welding. In this study, capacitive discharge resistance welding (CDRW)—a solid-state variant of resistance welding—was used to join end caps and thin-walled cladding tubes of the NFA 14YWT. The resulting solid-state joints were found to be hermetically sealed and were characterized across the weld region using electron microscopy (macroscopic, microscopic, and nanometer scales) and nanoindentation. Microstructural evolution near the weld line was limited to narrow (~50–200 μm) thermo-mechanically affected zones (TMAZs) and to a reduction in pre-existing component textures. Dispersoid populations (i.e., nano-oxides and larger oxide particles) appeared unchanged by all but the highest energy and power CDRW condition, with this extreme producing only minor nano-oxide coarsening (~2 nm → ~5 nm Ø). Despite a minimal microstructural change, the TMAZs were found to be ~10% softer than the surrounding base material. These findings are considered in terms of past solid-state welding (SSW) efforts—cladding applications and NFA-like materials in particular—and in terms of strengthening mechanisms in NFAs and the potential impacts of localized temperature–strain conditions during SSW.

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Summary of Prior Work on Joining of Oxide Dispersion-Strengthened Alloys

Cited by 6 publications

References 21 publications

Defective structures in FeCrAl alloys from first principles calculations

Defective structures in FeCrAl alloys from first principles calculations

Resistance Upset Welding of ODS Steel Fuel Claddings—Evaluation of a Process Parameter Range Based on Metallurgical Observations

Solid-State Welding of the Nanostructured Ferritic Alloy 14YWT Using a Capacitive Discharge Resistance Welding Technique

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