Hoffmann, A.

Rieth, M.

English

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www.kit.eduKIT – die Kooperation von Forschungszentrum Karlsruhe GmbH und Universität Karlsruhe (TH)FRACTURE BEHAVIOUR OF TUNGSTEN MATERIALSDEPENDING ON MICROSTRUCTURE AND SURFACE FABRICATIONThanks for contributions and discussions to:C. Bichler, B. Dafferner, C. Grubich, S. Heger, U. Jäntsch, M. Klimenkov, W. Krauss, P. Norajitra, J. Reiser,W. Schulmeyer, H. ZimmermannMichael Rieth & Andreas Hoffmann Contents - Overview- Materials- HT Charpy Test Facility- Test Results & Discussion- Conclusions and OutlookOverview, DEMO Divertor Design2 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008Tile (W)Thimble (WL10)Conic Sleeve(ODS EUROFER)ODS EUROFERCartridge(W, EUROFER)1700°C1200°C(Brazed Joint)700°C(Brazed Joint)ELMs, high energeticparticles, etc. J. Reiser, P. Norajitra, this conference10 MW/m²Motivation, Testing Method3 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008Fracturingthermal loadmechanical loadmanufacturingmaintenance events P. Norajitra, W. Krauss, et al.Charpy TestDIN EU ISO 148-1, …3 mm x 4 mm x 27 mmnotch depth 1mmspan 22 mmM. Rieth, B. Dafferner, JNMHigh Temperature Charpy Tests4 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008drop weight design, vacuum vessel opened furnace: view on supportvacuum: ~10-6 bar / ~1150°CtupspecimensupportMaterials, Rolling Texture5 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 20086 RODS 4 PLATESMicrostructure6 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008WL10 Rod, Ø7 mmlongitudinal transverseMicrostructure7 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008W-1%Re-1%La2O3 Rod, Ø10 mmlongitudinal transverseTEM Analysis8 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008WL10 Rod, Ø7 mm W Rod, Ø7 mmResults, Rod Materials9 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008DELAMINATIONW: 7 mm rod, EDMWL10: 7 mm rod, EDMFracture: W & WL10, 7 mm rods10 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008W Rod, EDMSurface Fabrication50 µm50 µmW Rod, Diamond Saw11 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008Delamination, Simple Analogy4331abc12 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008Results, Surface Fabrication13 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008Discussion14 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008Shift due to surface cracks fabrication issueShift due to load specimen geometry(stress concentration)Results, Plate Materials15 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008DELAMINATIONFracture: W & WL10, plates16 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008W WL10Discussion17 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008Base Material: Mo - W DBTT characteristicGB weakening type, size, distrib. of oxides grain shape, orientation, etc.Conclusions18 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008TZMW, un-notchedW, sawedWWVMWL10WL10optW-1Re-1La2O3TZMW300°C430°C------------------------------500°C / ≥600°C500°C / ≥600°C500°C / ≥600°C450°C / ≥500°C ?500°C / ≥600°C500°C / ≥600°C150°C / 200°C450°C / 500°C--- / 400°C--- / 450°C750°C / 800°C850°C / 900°C950°C / 1000°C>1000°C / ???>1000°C / ???>1000°C / ???>1000°C / ???>1100°C / ???Rod-Material DBTT BDTT / delamin. DDTT / ductileDBTT: ductile-to-brittle transition temperatureBDTT: brittle-to-delamination transition temperatureDDTT: delamination-to-ductile transition temperaturePlate-MaterialConclusions19 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008Microstructure significantly defines transition temperatures (rod texturemore favorable than that of plates)Oxide particles (and also potassium doping) promote delamination (but they are necessary for stabilizing GB  suppr. re-crystallization)Tungsten materials have a DBTT limit of ≥400°C (when produced bysintering & deformation, tested according to DIN EN ISO 148-1, …)Notches/edges have to be avoided in structural partsOptimum fabrication probably only by aligning grains along the contourof the according part deep drawing, twisting, pressing, …Outlook20 | M. Rieth, A. Hoffmann | 18th TOFE 2008 | October 2, 2008 J. Reiser, this conference

Fracture behaviour of tungsten materials depending on microstructure and surface fabrication

https://publikationen.bibliothek.kit.edu/240072967/3815309

Fracture behaviour of tungsten materials depending on microstructure and surface fabrication

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