Laser re-melting of tungsten damaged by transient heat loads

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dc.contributor.authorLoewenhoff, Thorsten
dc.contributor.authorLinke, Jochen Max
dc.contributor.authorMatějíček, Jiří
dc.contributor.authorRasiński, Marcin
dc.contributor.authorVostřák, Marek
dc.contributor.authorWirtz, Marius
dc.date.accessioned2017-05-17T11:06:29Z
dc.date.available2017-05-17T11:06:29Z
dc.date.issued2016
dc.description.abstract-translatedIn 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.en
dc.format6 s.cs
dc.format.mimetypeapplication/pdf
dc.identifier.citationLOEWENHOFF, 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.en
dc.identifier.doi10.1016/j.nme.2016.04.004
dc.identifier.issn2352-1791
dc.identifier.obd43917367
dc.identifier.urihttp://hdl.handle.net/11025/25996
dc.identifier.urihttps://www.scopus.com/record/display.uri?origin=resultslist&eid=2-s2.0-84969961314
dc.identifier.urihttp://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
dc.identifier.uri000391191500028
dc.identifier.uri2-s2.0-84969961314
dc.language.isoenen
dc.project.IDED2.1.00/03.0088/CENTEM - Centrum nových technologií a materiálůcs
dc.publisherElsevieren
dc.rightsPlný text není přístupný.cs
dc.rights© Elsevieren
dc.rights.accessclosedAccessen
dc.subjectplazmový obkladový materiálcs
dc.subjectlaserové přetavování povrchucs
dc.subjectpřechodné tepelné zatíženícs
dc.subjectwolframcs
dc.subject.translatedplasma facing materialen
dc.subject.translatedlaser surface remeltingen
dc.subject.translatedtransient heat loaden
dc.subject.translatedtungstenen
dc.titleLaser re-melting of tungsten damaged by transient heat loadsen
dc.typečlánekcs
dc.typearticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen

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