Berlin 2018 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 74: Structural Materials (Steels, light-weight materials, high-temperature materials)
MM 74.2: Vortrag
Freitag, 16. März 2018, 11:30–11:45, H 0106
Impact of Microstructure and Geometric Length Scales on Miniaturized Tensile Tests of Advanced Steels — •Jonas Finn Kutschmann1, Thomas Pretorius2, Andreas Offergeld2, Friederike Emeis1, Niklas Nollmann1, and Gerhard Wilde1 — 1Institute of Materials Physics, Westfälischen Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster — 2thyssenkrupp Steel Europe AG, Kaiser-Wilhelm-Straße 100, D-47166 Duisburg
In this work the mechanical properties of advanced steels are characterized by a miniaturized tensile test and compared to the results of other mechanical testing methods. The eleven steel raw materials were provided by thyssenkrupp and the miniaturized specimens were cut with a dog-bone shape contour. For one type of steel the dimensions were severely changed to verify an occurring specimen size effect. The influences of the geometric length scales were investigated by microstructural analysis using EBSD.
The tensile test results were correlated to Vickers hardness measurements, average grain size and thyssenkrupp database values for the ultimate tensile strength. Some steels reproduce the macro-scale results well in miniaturized testing whereas others show a significant drop in the performance. The overall performance of the miniaturized tensile tests were evaluated by the ultimate tensile strength and the fracture strain for one type of steel by varying the geometrical dimensions. The results suggest the inclusion of the standard deviation of the grain size distribution for a more independent evaluation of the specimen size effect.