Počet záznamů: 1  

Laser re-melting of tungsten damaged by transient heat loads

  1. 1.
    SYSNO ASEP0468205
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevLaser re-melting of tungsten damaged by transient heat loads
    Tvůrce(i) Loewenhoff, Th. (DE)
    Linke, J. (DE)
    Matějíček, Jiří (UFP-V) RID
    Rasinski, M. (DE)
    Vostřák, M. (CZ)
    Wirtz, M. (DE)
    Zdroj.dok.Nuclear Materials and Energy - ISSN 2352-1791
    Roč. 9, December (2016), s. 165-170
    Poč.str.6 s.
    Forma vydáníTištěná - P
    AkceInternational Conference of Fusion Reactor Material (ICFRM-17) /17./
    Datum konání11.10.2015 - 16.10.2015
    Místo konáníAachen
    ZeměDE - Německo
    Typ akceWRD
    Jazyk dok.eng - angličtina
    Země vyd.NL - Nizozemsko
    Klíč. slovaPlasma facing material ; Laser surface remelting ; Transient heat load ; Tungsten
    Vědní obor RIVJG - Hutnictví, kovové materiály
    CEPGA14-12837S GA ČR - Grantová agentura ČR
    Institucionální podporaUFP-V - RVO:61389021
    UT WOS000391191500028
    EID SCOPUS84969961314
    DOI10.1016/j.nme.2016.04.004
    AnotaceIn 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.
    PracovištěÚstav fyziky plazmatu
    KontaktVladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975
    Rok sběru2017