2021, Svetogorov, R., Bachurina, D., Suchkov, A., Gurova, J., Savelyev, M., Dzhumaev, P., Kozlov, I., Leont'eva-Smirnova, M., Sevryukov, O., Сучков, Алексей Николаевич, Гурова, Юлия Александровна, Савельев, Максим Дмитриевич, Джумаев, Павел Сергеевич, Козлов, Илья Владимирович, Леонтьева-Смирнова, Мария Владимировна, Севрюков, Олег Николаевич

© 2020Development of a reliable technology to join tungsten with steel is essential for DEMO application; however, it is difficult due to large differences in their physical properties. To solve this problem, high-temperature brazing was carried out. Cu-Ti brazing alloys, which were rapidly solidified into foil, were used together with a compensating vanadium interlayer, so the EK-181 steel/Cu-28Ti/V/Cu-50Ti/W and EK-181/Cu-50Ti/V/Cu-50Ti/W brazed joints were obtained. The microstructures of the seams were investigated by optical microscopy, SEM (EDX, EBSD) and synchrotron XRD. Thermocycling and shear strength tests showed that Cu-28Ti wt. % brazing alloy ensures a firmer joint compared to Cu-50Ti wt. %. The Cu-28Ti wt. % brazing alloy was used to perform high-temperature brazing in the brazing mode equivalent to traditional EK-181 steel heat treatment. It showed that every step of the heat treatment affected the microstructures and the shear strength.

2022, Bobyr, N., Kulikova, E., Gasparyan, Y., Bachurina, D., Efimov, V., Gurova, J., Podolyako, F., Sergeev, N. S., Sorokin, I. A., Suchkov, A., Kozlov, I., Spitsyn, A. V., Гаспарян, Юрий Микаэлович, Ефимов, Виталий Сергеевич, Гурова, Юлия Александровна, Подоляко, Федор Сергеевич, Сергеев, Никита Сергеевич, Сорокин, Иван Александрович, Сучков, Алексей Николаевич, Козлов, Илья Владимирович

© 2022 Elsevier B.V.The fully reduced activation brazing alloy TiZr4Be and a tantalum intermediate layer are considered to be used for joining tungsten (W) to reduced-activation ferritic-martensitic steel (RAFM) for future DEMO reactor application. Deuterium retention in the W-Rusfer joints and separate elements was investigated with the focus on the intermediate brazing layer. The samples were exposed in deuterium gas (p = 1–104 Pa, T = 300–600°C) and plasma discharge (T = 600°C). An acceptable deuterium concentration was observed after gas exposure at the pressure of 1 Pa, that is relevant to operating conditions of future fusion devices, however the brazing alloy and tantalum accumulate a large amount of deuterium in the case of the pressure above 100 Pa that leads to failure of the joint. The D retention after D plasma irradiation was substantial, but nearly independent on the fluence and the thickness of the W layer due to absorption from surrounding D2 gas.

2023, Gurova, J., Bachurina, D., Kozlov, I., Efimov, V., Krutikova, O., Suchkov, A., Spitsyn, A., Gasparyan, Y., Гурова, Юлия Александровна, Козлов, Илья Владимирович, Ефимов, Виталий Сергеевич, Крутикова, Ольга Михайловна, Сучков, Алексей Николаевич, Гаспарян, Юрий Микаэлович