Title:	Laser re-melting of tungsten damaged by transient heat loads
Authors:	Loewenhoff, Thorsten Linke, Jochen Max Matějíček, Jiří Rasiński, Marcin Vostřák, Marek Wirtz, Marius
Citation:	LOEWENHOFF, Thorsten, LINKE, Jochen Max, MATĚJÍČEK, Jiří, RASIŃSKI, Marcin, VOSTŘÁK, Marek, WIRTZ, Marius. Laser re-melting of tungsten damaged by transient heat loads. Nuclear Materials and Energy, 2016, roč. 9, č. 1 December 2016, s. 165-170. ISSN 2352-1791.
Issue Date:	2016
Publisher:	Elsevier
Document type:	článek article
URI:	http://hdl.handle.net/11025/25996 https://www.scopus.com/record/display.uri?origin=resultslist&eid=2-s2.0-84969961314 http://apps.webofknowledge.com/InboundService.do?mode=FullRecord&customersID=Alerting&IsProductCode=Yes&product=WOS&Init=Yes&Func=Frame&DestFail=http%3A%2F%2Fwww.webofknowledge.com&action=retrieve&SrcApp=Alerting&SrcAuth=Alerting&SID=U1wnLaUtaTrKMC1Crfb&UT=WOS%3A000391191500028 000391191500028 2-s2.0-84969961314
ISSN:	2352-1791
Keywords:	plazmový obkladový materiál;laserové přetavování povrchu;přechodné tepelné zatížení;wolfram
Keywords in different language:	plasma facing material;laser surface remelting;transient heat load;tungsten
Abstract in different language:	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.
Rights:	Plný text není přístupný. © Elsevier
Appears in Collections:	Články / Articles (KFY) OBD

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