Thermomechanical Characterisation of W-Eurofer 97 Brazed Joints

Tejado Garrido, Elena María and Prado Escudero, Javier de and Tarancón Román, Sandra and Sánchez Martínez, María and Martín Sanz, Antonia and Pastor Caño, José Ignacio and Ureña Fernández, Alejandro (2020). Thermomechanical Characterisation of W-Eurofer 97 Brazed Joints. "Journal of Nuclear Materials", v. 542 ; p. 152504. ISSN 0022-3115. https://doi.org/10.1016/j.jnucmat.2020.152504.

Description

Title: Thermomechanical Characterisation of W-Eurofer 97 Brazed Joints
Author/s:
  • Tejado Garrido, Elena María
  • Prado Escudero, Javier de
  • Tarancón Román, Sandra
  • Sánchez Martínez, María
  • Martín Sanz, Antonia
  • Pastor Caño, José Ignacio
  • Ureña Fernández, Alejandro
Item Type: Article
Título de Revista/Publicación: Journal of Nuclear Materials
Date: 15 December 2020
ISSN: 0022-3115
Volume: 542
Subjects:
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ciencia de los Materiales
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

The preliminary conceptual design of both the blanket and the divertor of the future DEMO reactor envisages tungsten as plasma-facing material joined to Eurofer 97 steel as the structural element. Therefore, the development of new joining technologies to constitute these first wall components has become an essential task in the fusion community. In this regard, there is a lack of knowledge on the thermal stability and mechanical behaviour of these W-Eurofer 97 joints under the expected service temperatures, which will be situated around 400–600 °C. In this paper, successful diffusion brazing of Eurofer 97 steel with tungsten was achieved by using a copper interlayer. Its microstructure, hardness and flexural strength were investigated for different configurations and thermal histories in its predicted operating temperature range. Investigations on as-brazed specimens showed defect-free interfaces and a continuous metallic bond between W and Eurofer 97 was successfully accomplished; although the hardening of steel base material was detected after joining. Microstructure alterations were observed just at the W-Eurofer 97 interface, with the diffusion of Cu braze into the iron grain boundaries and the formation of a Fe-rich hard intermetallic layer, which was, in fact, the weakest part of the joint during thermo-mechanical testing. The flexural strength of the brazed specimens at room temperature was relatively low, with a strong dependence on the anisotropy of the W base material and little influence of the stress-relieving thermal treatment. However, testing at temperatures up to 600 °C showed high strength of the bonded specimens, with values as high as 470 MPa, comparable to those of the Eurofer 97 steel.

Funding Projects

TypeCodeAcronymLeaderTitle
Horizon 2020633053EUROfusionMAX-PLANCK-GESELLSCHAFT ZUR FORDERUNG DER WISSENSCHAFTEN EVImplementation of activities described in the Roadmap to Fusion during Horizon 2020 through a Joint programme of the members of the EUROfusion consortium
Government of SpainMAT2015-70780-C4-4-PUnspecifiedUnspecifiedCompuestos cerámica-metal y aleaciones refractarias de W para su aplicación bajo condiciones de servicio severas: diseño microestructural y nuevas rutas de procesamiento
Madrid Regional GovernmentS2018/NMT-4411ADITIMAT-CMUnspecifiedAdditive Manufacturing: from material to apllication
Madrid Regional GovernmentM190 020 074EMTGCOAT4FUSIONUniversidad Politécnica de MadridUnspecified

More information

Item ID: 63998
DC Identifier: http://oa.upm.es/63998/
OAI Identifier: oai:oa.upm.es:63998
DOI: 10.1016/j.jnucmat.2020.152504
Official URL: https://www.sciencedirect.com/science/article/pii/S0022311520311120
Deposited by: Memoria Investigacion
Deposited on: 22 Sep 2020 15:19
Last Modified: 22 Sep 2020 15:19
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