Number of the records: 1
Laser re-melting of tungsten damaged by transient heat loads
- 1.
SYSNO ASEP 0468205 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Laser re-melting of tungsten damaged by transient heat loads Author(s) Loewenhoff, Th. (DE)
Linke, J. (DE)
Matějíček, Jiří (UFP-V) RID, ORCID
Rasinski, M. (DE)
Vostřák, M. (CZ)
Wirtz, M. (DE)Source Title Nuclear Materials and Energy. - : Elsevier
Roč. 9, December (2016), s. 165-170Number of pages 6 s. Publication form Print - P Action International Conference of Fusion Reactor Material (ICFRM-17) /17./ Event date 11.10.2015 - 16.10.2015 VEvent location Aachen Country DE - Germany Event type WRD Language eng - English Country NL - Netherlands Keywords Plasma facing material ; Laser surface remelting ; Transient heat load ; Tungsten Subject RIV JG - Metallurgy R&D Projects GA14-12837S GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 UT WOS 000391191500028 EID SCOPUS 84969961314 DOI 10.1016/j.nme.2016.04.004 Annotation 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. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2017
Number of the records: 1