Berlin 2015 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 26: Functional Materials V: Functional Materials
MM 26.2: Talk
Tuesday, March 17, 2015, 12:00–12:15, TC 010
Optimization of Tungsten-Steel Joints for Plasma Facing Components in Fusion Reactors — •Simon Heuer1, Thomas Weber2, Jiří Matějíček3, Jochen Linke2, and Christian Linsmeier1 — 1Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Plasmaphysik, 52425 Jülich, Germany — 2Forschungszentrum Jülich GmbH, Institut für Energie- und Klimaforschung - Werkstoffstruktur und -eigenschaften, 52425 Jülich, Germany — 3Institute of Plasma Physics, Academy of Sciences of the Czech Republic, 18200 Prague 8, Czech Republic
Tungsten, joint to a martensitic-ferritic EUROFER97 structure, is a promising plasma facing material composite for fusion reactors. Due to the effect of mismatch in thermo-mechanical properties direct bonding is not feasible. Current research is therefore ongoing on interlayer systems. While the adhesion was already improved by the utilization of a discrete Cu, Ti or V interlayer, that is able to relax stresses by plastic deformation, joints still do not resist the expected load cycles in a fusion reactor. Therefore, alternatives for the interface are needed. This contribution presents research on functionally graded materials (FGM). The particular microstructure of a graded interlayer allows re-distributing macro stresses from a discrete interface to a greater volume while avoiding in particular Cu which tends to swell under neutron irradiation. A parameter study on the basis of finite element analysis will be presented as well as first results of several processing routes for FGM that shall be evaluated and benchmarked by mechanical as well as thermal testing.