Process optimization for diffusion bonding of tungsten with EUROFER97 using a vanadium interlayer

Widodo, Basuki; Aktaa, Jarir

doi:10.1016/j.jnucmat.2015.01.033

Cited by 44 publications

(14 citation statements)

References 13 publications

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“…Rusfer/Ta seam can be divided into the following zones: (1) martensite grains, (2) ferritic grains, (3) interaction zone with sharp phases, (4) interaction zone with elongated grains, (5) pure tantalum. Formation of the ferritic zone was also observed in [15,27,45]. The thickness of the layer increases closer to the fillet, because in Figure 6, a 50 µm ferritic layer formed, but in the central zone of a sample [27], this was 20 µm.…”

Section: Microstructural Analysismentioning

confidence: 63%

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Brazing Tungsten/Tantalum/RAFM Steel Joint for DEMO by Fully Reduced Activation Brazing Alloy 48Ti-48Zr-4Be

Bachurina

Сучков

Gurova

et al. 2021

Metals

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To create a DEMO reactor, it is necessary to develop high-quality technology to join tungsten with reduced-activation ferritic-martensitic (RAFM) steel (Rusfer, Eurofer, CLF-1, etc.). Difficulties arise in their direct connection due to the large difference in the coefficient of thermal expansion (CTE). To suppress the difference of CTE, intermediate interlayers are usually used, such as vanadium or tantalum, and brazing is a prospective technology to conduct the joining. The vast majority of works represent copper- or nickel-based brazing alloys, but their applicability is under significant discussion due to their activation properties. That is why, in this work, fully reduced activation 48Ti-48Zr-4Be wt.% brazing alloy was used. The following joint was made: Rusfer steel/48Ti-48Zr-4Be/Ta/48Ti-48Zr-4Be/W. The brazing was successfully carried out under a mode providing thermal heat treatment of Rusfer. Through EDS and EBSD analysis, the microstructure of the joint was determined. Shear strength of the as-joined composition was measured as 127 ± 20 MPa. The joint endured 200 thermocycles in the temperature range between 300–600 °C, but the fillet regions degraded.

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Section: Microstructural Analysismentioning

confidence: 63%

“…No further growth of ferritic grains occurred. Ferritization and further carbide formation can be expected if the operation temperature exceeds 700 • C, because the ferritic layer forms during diffusion bonding at a temperature higher than 700 • C [45].…”

Section: Thermocyclingmentioning

confidence: 99%

Brazing Tungsten/Tantalum/RAFM Steel Joint for DEMO by Fully Reduced Activation Brazing Alloy 48Ti-48Zr-4Be

Bachurina

Сучков

Gurova

et al. 2021

Metals

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“…In detail, a certain joint strength, a low activation rate, and excellent thermal conductivity should be simultaneously achieved. Currently, Ni, Ti, V, and Cu [9][10][11][12][13] have been developed, and there is still room for improvement because of issues such as neutron irradiation transmutation-radioactivity, low thermal conductivity, and insufficient joint strength.…”

Section: Introductionmentioning

confidence: 99%

Performance and evolution of W/steel joint fabricated by selective laser melting

Chen

Qiu

et al. 2022

Science and Technology of Welding and Joining

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Herein, attempts were made to develop W/steel joints via selective laser melting (SLM) for the first time. The influence of processing parameters on the joint strength was investigated. To further improve the mechanical properties, we performed post-heat treatment on the asfabricated specimens. The results showed that large amounts of solid solution and dispersed micro-/nanoparticles appear in the interface of W/steel joints fabricated by direct SLM because of the uniqueness of non-equilibrium solidification, which is favourable for the bonding properties. However, the solid solution gradually transforms into the Fe 2 W(Ni, Cr) phase encapsulated with W particles during heat treatment, while the Fe 7 W 6 phase fills the poles at the W/steel interface, which is extremely detrimental to the bonding properties.

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“…Tungsten and its alloys tend to cause incomplete fusion during fusion welding because of their high melting point and thermal conductivity. The joining of tungsten alloys has been achieved by several procedures: brazing [5,6,7], diffusion bonding [8,9,10] and laser brazing [11]. Among them, high temperature brazing seems to be the most suitable method because of its limited influence on properties of base materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ti on Microstructure and Properties of Tungsten Heavy Alloy Joint Brazed by CuAgTi Filler Metal

Qiu

Ruan

et al. 2019

Materials

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In this paper, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffractometer (XRD) were used to comprehensively analyze the microstructure and brazing performance of a CuAgTi filler metal with braze tungsten heavy alloys. The association of microstructure, wettability and shear strength of brazing joints was also investigated. With the addition of Ti, the Ti3Cu4 phase appeared in the microstructure of filler metal. Ti is active element that promotes the reaction of filler with tungsten. Therefore, the Ti element is enriched around tungsten and forms a Ti2Cu layer at the interface, leaving a Cu-rich/Ti-poor area on the side. Remaining Ti and Cu elements form the acicular Ti3Cu4 structure at the center of the brazing zone. The wettability of filler metal is improved, and the spreading area is increased from 120.3 mm2 to 320.9 mm2 with the addition of 10 wt.% Ti. The shear strength of joint reaches the highest level at a Ti content of 2.5 wt.%, the highest shear strength is 245.6 MPa at room temperature and 142.2 MPa at 400 °C.

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Process optimization for diffusion bonding of tungsten with EUROFER97 using a vanadium interlayer

Cited by 44 publications

References 13 publications

Brazing Tungsten/Tantalum/RAFM Steel Joint for DEMO by Fully Reduced Activation Brazing Alloy 48Ti-48Zr-4Be

Brazing Tungsten/Tantalum/RAFM Steel Joint for DEMO by Fully Reduced Activation Brazing Alloy 48Ti-48Zr-4Be

Performance and evolution of W/steel joint fabricated by selective laser melting

Effect of Ti on Microstructure and Properties of Tungsten Heavy Alloy Joint Brazed by CuAgTi Filler Metal

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