Abstract
The testing of small sized samples is an important advantage of the instrumented indentation with respect to the investigation of materials for fusion application. A continuous recording of the indentation depth and force enables a determination of mechanical properties of the tested material.In this study, the results of the high temperature experiments with a custom made indentation device are presented. The reduced activation ferritic martensitic steel EUROFER is investigated in an unirradiated state with spherical tips and for the first time Vickers tips at increasing temperatures up to 500°C.The indentation procedure is numerically simulated at different temperatures and the corresponding load-displacement-data are compared with the experimental results. A quantification of the influence of variations of the indentation tip radius is presented as well.Finally, the operation of the indentation device with respect to the restrictions of the Hot Cell environment is discussed.
Highlights
The development and qualification of new compositions of structural materials for the application in future fusion power plants is an important field of current fusion research
The use of small sized indentation samples has a positive effect on the costs of irradiation programs and the dose rate of the single specimen and is indispensable for a future neutron source, because of its small irradiation chamber
By using a commercial indentation system at the Fusion Material Laboratory (FML), promising results already were obtained by instrumented indentation experiments at room temperature on irradiated specimens [12]
Summary
The development and qualification of new compositions of structural materials for the application in future fusion power plants is an important field of current fusion research. A candidate material like EUROFER, a low activation steel, needs to be investigated in irradiated state at the operation conditions of nuclear fusion, to obtain a complete understanding of the material behavior [11]. By using a commercial indentation system at the Fusion Material Laboratory (FML), promising results already were obtained by instrumented indentation experiments at room temperature on irradiated specimens [12]. In contrast to commercial systems, the device is designed for future remote-handled investigations of neutron irradiated materials in a Hot Cell of the Fusion Materials Laboratory at KIT. More detailed insight in the indentation device and the different setups are given in [14] and [15]
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