Analysis of the brazeability of W–W joints using a high temperature Ni-based alloy

Sánchez, M.; Garrido, Miguel Angel Amaró; Múnez, C.J.; Rams, J.; Ureña, A.

doi:10.1016/j.matdes.2013.08.106

Cited by 17 publications

(3 citation statements)

References 17 publications

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“…However, this is a complicated and expensive process. Tungsten heavy alloy is often joined by conventional fusion welding methods, such as diffusion bonding [ 16 , 17 , 18 ], brazing [ 19 , 20 ], or electron beam welding [ 21 , 22 ]. Problems include cracks, brittle intermetallic phase formation, weld porosity, and grain growth due to the increased temperature in fusion welding.…”

Section: Introductionmentioning

confidence: 99%

TEM Microstructure, Mechanical Properties and Temperature Estimation in the 5XXX Series Al-Mg-Si Aluminum Alloy with W-Ni-Fe Tungsten Composite Friction-Welded Joints

et al. 2022

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The temperature distributions, microstructure, and mechanical properties of tungsten composite with aluminum alloy friction-welded joints are presented in this paper. The effects of welding parameters on flash diameter, shortening, joint efficiency, microhardness, and microstructure were studied. Empirical temperature models for heating and cooling phases are proposed in this study. The predicted maximum temperatures at the periphery and in the axis of aluminum specimens were close to 550 °C and 480 °C at the interface, respectively. Moreover, the peak temperature in the weld zone was studied analytically. A maximum tensile strength of 234 MPa was reached for the following welding parameters: friction time of 3.5 s and friction force of 12.5 kN. The efficiency of the welded samples decreased after reaching the maximum value, with an increase of friction time and force. Maximum hardness at the interface and the half-radius reached 100 HV and 80 HV in the aluminum alloy joints, respectively. Dynamic recrystallisation areas on the aluminum alloy side were observed. Transmission electron microscopy observations of the microstructure in the aluminum alloy revealed the presence of a high dislocation density compared to the parent material.

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Section: Introductionmentioning

confidence: 99%

TEM Microstructure, Mechanical Properties and Temperature Estimation in the 5XXX Series Al-Mg-Si Aluminum Alloy with W-Ni-Fe Tungsten Composite Friction-Welded Joints

et al. 2022

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“…Among them, high temperature brazing seems to be the most suitable method because of its limited influence on properties of base materials. In order to braze tungsten alloy, various components of filler metals have been investigated, such as Fe-based filler metals [12,13], Ni-based filler metals [14,15] and Cu-based filler metals [16,17]. However, when the brazing temperature is above the recrystallization temperature of W (1100–1370 °C), performance changes of base metals such as grain growth, harden, and embrittlement could occur because of the high melting point of filler metals [18].…”

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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“…High stability against thermocycling was reached in the monocrystalline W/RAFM steel joint, while branched cracks were observed in the powder metallurgy W substrate. On the other hand, the use of a nickel alloy is not appropriate since Ni element can promote helium accumulation under neutron irradiation, which causes embrittlement of the brazed joint [9][10][11]. A new filler metal, namely, Fe bal -Ta-Ge-Si-B-Pd, has been further developed by Kalin et al for brazing W and RAFM steel [10].…”

Section: Introductionmentioning

confidence: 99%

A Ti-Fe-Sn thin film assembly for joining tungsten and reduced activation ferritic-martensitic steels

et al. 2017

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Analysis of the brazeability of W–W joints using a high temperature Ni-based alloy

Cited by 17 publications

References 17 publications

TEM Microstructure, Mechanical Properties and Temperature Estimation in the 5XXX Series Al-Mg-Si Aluminum Alloy with W-Ni-Fe Tungsten Composite Friction-Welded Joints

TEM Microstructure, Mechanical Properties and Temperature Estimation in the 5XXX Series Al-Mg-Si Aluminum Alloy with W-Ni-Fe Tungsten Composite Friction-Welded Joints

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

A Ti-Fe-Sn thin film assembly for joining tungsten and reduced activation ferritic-martensitic steels

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