Development of brazing foils to join monocrystalline tungsten alloys with ODS-EUROFER steel

Kalin, B. A.; Fedotov, V. T.; Sevrjukov, O.N.; Kalashnikov, A. N.; Сучков, А. Н.; Moeslang, A.; Rohde, Magnus

doi:10.1016/j.jnucmat.2007.03.222

Cited by 63 publications

(29 citation statements)

References 8 publications

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“…1(b), were evaluated by miniaturized four-point bending test method with a specially designed xture of the upper and lower spans of 0.8 and 3.0 mm, respectively 6) . The details of specimen setting is shown in Fig.…”

Section: Evaluation Of Mechanical Propertiesmentioning

confidence: 99%

“…1,2) and ODS-FS is superior in high temperature mechanical properties 3,4) . Bonding of tungsten and ODS-FS is hence a critical for the fabrication of high-performance blanket, and various bonding processes have been applied for the joint so far [5][6][7] . A dif culty in bonding tungsten with ODS-FS is that a large difference in the coef cient of thermal expansion (CTE) between the materials causes a rather large thermal stress at the bonding interface so that the joint was damaged by cracking at tungsten near the interface during cooling after bonding.…”

Section: Introductionmentioning

confidence: 99%

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Development of High Strength Tungsten/Oxide Dispersion Strengthened Ferritic Steel Joints by Innovative Thermal Stress Relaxation Technique Based on Phase-Transformation-Induced Creep Deformation

et al. 2016

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The realization of fusion reactors rests on the function of the blanket systems with high thermal ef ciency consisting of armor and structural materials. The fabrication of the blanket requires upgrade of bonding technology which makes the components reliable. The combination of tungsten and oxide dispersion strengthened ferritic steel (ODS-FS) is considered to be adequate for the application to the fusion diverter components. The issue of diffusion bonding of tungsten with ODS-FS is to reduce thermal stresses caused by a large difference in thermal expansion coef cient between the two materials. In this study, an innovative thermal stress relaxation methodology during cooling has been newly proposed as a key technology in joining, which is based on the phenomenon of γ→α phase transformation-induced creep deformation of low carbon steel inserted between tungsten and ODS-FS. In the cooling pattern where the joint was slowly cooled at a rate of approximately 1.6 C/min from 800 C to 600 C. The application of the technology to the diffusion bonding of tungsten/ODS-FS resulted in a very high bonding strength of 480 MPa, which has never been achieved so far by the conventional bonding methodologies.

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Section: Evaluation Of Mechanical Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Development of High Strength Tungsten/Oxide Dispersion Strengthened Ferritic Steel Joints by Innovative Thermal Stress Relaxation Technique Based on Phase-Transformation-Induced Creep Deformation

et al. 2016

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“…Now considerable interest has been generated in brazing of W metal and W-Cu composite with amorphous filler metals [7][8][9][10][11][12]. Researchers from the Moscow Institute of Engineering and Physics have researched the bonding mechanism of dissimilar materials in brazing W alloy and steel with amorphous filler metals of Ni-based, Ti-based and Fe-based [13]. Amorphous filler metals showed a good promising property in improving the performance of the brazed joint.…”

Section: Introductionmentioning

confidence: 99%

Influence of brazing clearance on microstructure and properties of W-Cu/1Cr18Ni9 steel brazed joint with Ni-Cr-Si-B amorphous filler metal

Xia¹,

Yang²,

Zou³

et al. 2016

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W-Cu composite and 1Cr18Ni9 steel were brazed with Ni-based amorphous filler metal in a vacuum furnace. Four-point bending strength, fracture morphology, microstructure and elements distribution were studied by a series of standard methods. Then the influence of brazing clearance on microstructure and properties of the brazed joint were analyzed and discussed. Results indicated that, within the scope of the selected parameters, bending strength of the brazed joint increased significantly as reducing the brazing clearance. While the brazing clearance controlled to be 20 µm, the four-point bending strength performed the largest value, up to 333 MPa. The joint fracture showed a typical ductile fracture characteristics. Microstructure of the brazing seam was mainly composed of γ-Ni solid solution, W-Ni solid solution, CrB, and a part of eutectic phases of Ni3Si and Ni3B. The microstructure of brazed joint with brazing clearance 20 µm was more uniform and more stable. Microstructure and element of brazed joint almost transformed into single-phase solid solution. Meanwhile, micro holes disappeared and a number of brittle phases reduced, which provided well plastic reserves for the brazed joint.K e y w o r d s : W-Cu composite, brazing clearance, microstructure, fracture, bending strength

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“…The joining techniques such as active metal brazing [6], plasma spraying [7], and diffusion bonding [8,9] have been developed for joining of W to RAFM steels. The metallic brazing produced high strength joints and provided well reproducible results.…”

Section: Introductionmentioning

confidence: 99%

“…The metallic brazing produced high strength joints and provided well reproducible results. Nevertheless, the brazing temperature of 1,150°C is high and causes grain coarsening in steel which is undesirable [6]. Additionally, it is difficult to obtain a high density W coating on steel for the components produced by plasma spraying.…”

Section: Introductionmentioning

confidence: 99%

Diffusion Bonding of Tungsten to Reduced Activation Ferritic/Martensitic Steel F82H Using a Titanium Interlayer

Zhong

Hinoki

2010

Zero-Carbon Energy Kyoto 2009

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Development of materials and related fabrication process is one of the most important technologies for fusion energy development. In fusion reactor, joining of tungsten (W) to reduced activation ferritic/martensitic steel is required. In this work, diffusion bonding between W and ferritic/martensitic steel F82H using a Ti interlayer was investigated. The results indicated that all the joints were successfully obtained. The interfacial microstructure was analyzed by scanning electron microscopy. The chemical composition of these reaction products were determined by energy dispersive spectroscopy. W-Ti solid solution was found at W/Ti interface, while Ti/F82H interface formed complex phases which dependent on the joining temperature. Bond strength was evaluated and the maximum shear strength was obtained for the joint bonded at 900°C. The failure was occurred at Ti/F82H interface during shear testing.

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Development of brazing foils to join monocrystalline tungsten alloys with ODS-EUROFER steel

Cited by 63 publications

References 8 publications

Development of High Strength Tungsten/Oxide Dispersion Strengthened Ferritic Steel Joints by Innovative Thermal Stress Relaxation Technique Based on Phase-Transformation-Induced Creep Deformation

Development of High Strength Tungsten/Oxide Dispersion Strengthened Ferritic Steel Joints by Innovative Thermal Stress Relaxation Technique Based on Phase-Transformation-Induced Creep Deformation

Influence of brazing clearance on microstructure and properties of W-Cu/1Cr18Ni9 steel brazed joint with Ni-Cr-Si-B amorphous filler metal

Diffusion Bonding of Tungsten to Reduced Activation Ferritic/Martensitic Steel F82H Using a Titanium Interlayer

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