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Laser re-melting of tungsten damaged by transient heat loads
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SYSNO ASEP 0468205 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Laser re-melting of tungsten damaged by transient heat loads Tvůrce(i) Loewenhoff, Th. (DE)
Linke, J. (DE)
Matějíček, Jiří (UFP-V) RID, ORCID
Rasinski, M. (DE)
Vostřák, M. (CZ)
Wirtz, M. (DE)Zdroj.dok. Nuclear Materials and Energy. - : Elsevier
Roč. 9, December (2016), s. 165-170Poč.str. 6 s. Forma vydání Tištěná - P Akce International Conference of Fusion Reactor Material (ICFRM-17) /17./ Datum konání 11.10.2015 - 16.10.2015 Místo konání Aachen Země DE - Německo Typ akce WRD Jazyk dok. eng - angličtina Země vyd. NL - Nizozemsko Klíč. slova Plasma facing material ; Laser surface remelting ; Transient heat load ; Tungsten Vědní obor RIV JG - Hutnictví, kovové materiály CEP GA14-12837S GA ČR - Grantová agentura ČR Institucionální podpora UFP-V - RVO:61389021 UT WOS 000391191500028 EID SCOPUS 84969961314 DOI 10.1016/j.nme.2016.04.004 Anotace In the current study, a solid state disc laser with a wavelength of 1030 nm and maximum power of 5.3 kW was used to melt the surface of pure tungsten samples (manufactured according to ITER specifications by Plansee SE). Several combinations of laser power and traverse velocity were tested, with the aim of eliminating any pre-existing cracks and forming a smooth and contiguous resolidified surface. Some of the samples were previously damaged by the electron beam simulation of 100 THLs of 0.38 GW/m² intensity (Δt = 1 ms) on a 4 × 4 mm² area in the JUDITH 1 facility. These conditions were chosen because the resulting damage (crack network) and the crack depth (∼200–300 µm) are known from previous identical material tests with subsequent cross sectioning. After laser melting, the samples were analyzed by SEM, laser profilometry and metallographic cross sectioning. A closed surface without cracks, an increased grain size and pronounced grain boundaries in the resolidified area were found. Profilometry proved that the surface height variations are within ±25 µm from the original surface height, meaning a very smooth surface was achieved. These results successfully demonstrate the possibility of repairing a cracked tungsten surface by laser surface re-melting. This “laser repair” could be used to extend the lifetime of future plasma facing components. Pracoviště Ústav fyziky plazmatu Kontakt Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Rok sběru 2017
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