Mainz 2022 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 18: Helmholtz Graduate School HEPP IV
P 18.1: Vortrag
Donnerstag, 31. März 2022, 14:00–14:25, P-H12
Microstructure and deformation behaviour of drawn W wires — •Maximilian Fuhr1,2, Nuttawan Ketkao1,3, Till Höschen1, Nico Hempel2, Martin Balden1, Wolfgang Pantleon4, Jürgen Almanstötter5, David Rafaja3, Johann Riesch1, and Rudolf Neu1,2 — 1Max-Planck-Insitut für Plasmaphysik, Garching, Deutschland — 2Technische Universität München, Garching, Deutschland — 3TU Bergakademie Freiberg, Freiberg, Deutschland — 4Technical University of Denmark, Lyngby, Dänemark — 5OSRAM GmbH, Schwabmünchen, Deutschland
Tungsten (W) shows a pronounced transition from ductile deformation behaviour at high temperatures to brittle behaviour at low temperatures (ductile-to-brittle transition). Standard, coarse-grained W exhibits transition temperatures TDBT around 300∘ C, rendering it unsuitable for structural applications below TDBT. The transition is shifted to lower temperatures by cold-working W in wire drawing, rolling or a severe plastic deformation process. Sufficiently cold-worked W materials deform plastically at room temperature and below. The reasons for the shift of TDBT are connected to the deformation-induced microstructural changes. Thus, we performed the first systematic study focusing on the structure-property relations of a series of sequentially drawn potassium-doped W wires. The combination of careful microstructural investigations (electron backscatter diffraction (EBSD), X-ray diffraction (XRD)) and various mechanical tests performed at room and elevated temperatures allow for new insights into the deformation behaviour of drawn W wires.