Brazing Tungsten/Tantalum/RAFM Steel Joint for DEMO by Fully Reduced Activation Brazing Alloy 48Ti-48Zr-4Be
| Autor: | O. N. Sevryukov, Vladislav Kliucharev, Vladimir Vorkel, Pavel Somov, Julia Gurova, Diana Bachurina, A. N. Suchkov, Maxim Savelyev |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Mining engineering. Metallurgy tungsten joining Alloy Metallurgy Metals and Alloys Tantalum TN1-997 Rusfer chemistry.chemical_element Tungsten engineering.material Microstructure Thermal expansion First Wall chemistry RAFM steel engineering Shear strength Brazing General Materials Science Fillet (mechanics) DEMO brazing |
| Zdroj: | Metals Volume 11 Issue 9 Metals, Vol 11, Iss 1417, p 1417 (2021) |
| ISSN: | 2075-4701 |
| DOI: | 10.3390/met11091417 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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