Effect of joining temperature on the microstructure and strength of W–steel HIP joints with Ti/Cu composite interlayer

Cai, Qingshan; Liu, Wensheng; Ma, Yunzhu; Zhu, Wentan; Pang, Xinkuan

doi:10.1016/j.jnucmat.2018.05.004

Cited by 25 publications

(5 citation statements)

References 34 publications

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“…Therefore, the intermetallic compounds with the high hardness and the Ni layer and the Cu layer with good ductility can cooperate with each other to jointly improve the wear resistance of the Ni/Cu/Ni coating. When the annealing temperature was up to 800 • C, the NiTi 2 and Cu 4 Ti 3 phases could be formed in the coating, which had a higher microhardness than the Ni 3 Ti, CuTi, and Cu 2 Ti phases [19,32]. Therefore, they would act as a supporting load to reduce the furrow effect of the counter ball to the coating during the wear test.…”

Section: Wear Mechanismmentioning

confidence: 99%

Tribological Properties of Ni/Cu/Ni Coating on the Ti-6Al-4V Alloy after Annealing at Various Temperatures

et al. 2020

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Diffusion reaction was a crucial route to enhance the wear resistance of Ti-6Al-4V alloys surface. In this work, the Ni/Cu/Ni composite layers were fabricated on the surface of Ti-6Al-4V alloy by electroplate craft, and then different annealing temperatures were applied to further optimize its tribological properties. The diffusion behaviors at various temperatures were systematically analyzed to reveal the physical mechanism of the enhanced tribological properties of the coatings. It was demonstrated that CuxTiy and NixTiy intermetallic compounds with high hardness and strength were produced in the Ni/Cu/Ni coating, which acted as the reinforcing phases and improved the microhardness, reduced the friction coefficient, and lessened the wear rate. Specially, this effect reached the maximum when the annealing temperature was 800 °C, showing excellent wear resistance. This work revealed the relationship between annealing temperatures and tribological properties of the Ni/Cu/Ni coating, and proposed wear mechanism, aiming to improve the surface performance of Ti-6Al-4V alloy by appropriate diffusion behavior.

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Section: Wear Mechanismmentioning

confidence: 99%

Tribological Properties of Ni/Cu/Ni Coating on the Ti-6Al-4V Alloy after Annealing at Various Temperatures

et al. 2020

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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%

“…In detail, a certain joint strength, a low activation rate, and excellent thermal conductivity should be simultaneously achieved. Currently, Ni, Ti, V, and Cu [9-13] 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. For the case of solid-state diffusion bonding, superior compatibility and solid solubility of constituent elements is required along with the absence of brittle alloy phases (mostly Fe 7 W 6 ) [6].…”

Section: Introductionmentioning

confidence: 99%

“…More importantly, all the above processes involve integral heat treatment (e.g. hot pressing (HP), hot isostatic pressing (HIP), and spark plasma sintering (SPS)), which might lead to a negative effect on steel, such as the generation of metal carbides or brittle phases, grain coarsening, and structural transformation [11, 14]. Therefore, effectively avoiding the generation of brittle phases in the intermediate layer while suppressing the introduction of brazing impurities is always a challenge.…”

Section: Introductionmentioning

confidence: 99%

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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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“…At the moment, diffusion bonding and brazing are the two main methodologies being considered to achieve such a joint. The first is carried out by means of hot isostatic pressing [8,9] and spark plasma sintering [10,11]. The second is carried out by means of vacuum brazing, using foils [12,13], powders [14], and liquid-forming interlayers [15].…”

Section: Introductionmentioning

confidence: 99%

Overview of the Mechanical Properties of Tungsten/Steel Brazed Joints for the DEMO Fusion Reactor

Bachurina

Vorkel

Сучков

et al. 2021

Metals

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A Demonstration (DEMO) thermonuclear reactor is the next step after the International Thermonuclear Experimental Reactor (ITER). Designs for a DEMO divertor and the First Wall require the joining of tungsten to steel; this is a difficult task, however, because of the metals’ physical properties and necessary operating conditions. Brazing is a prospective technology that could be used to solve this problem. This work examines a state-of-the-art solution to the problem of joining tungsten to steel by brazing, in order to summarize best practices, identify shortcomings, and clarify mechanical property requirements. Here, we outline the ways in which brazing technology can be developed to join tungsten to steel for use in a DEMO application.

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Effect of joining temperature on the microstructure and strength of W–steel HIP joints with Ti/Cu composite interlayer

Cited by 25 publications

References 34 publications

Tribological Properties of Ni/Cu/Ni Coating on the Ti-6Al-4V Alloy after Annealing at Various Temperatures

Tribological Properties of Ni/Cu/Ni Coating on the Ti-6Al-4V Alloy after Annealing at Various Temperatures

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

Overview of the Mechanical Properties of Tungsten/Steel Brazed Joints for the DEMO Fusion Reactor

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