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MM: Fachverband Metall- und Materialphysik
MM 39: Structural Materials (Steels, light-weight materials, high-temperature materials)
MM 39.1: Vortrag
Donnerstag, 4. April 2019, 15:00–15:15, H45
Impact of Ferritic, Pearlite and Martensitic Micro-structured Steels and Geometric Length Scales on Micro Tensile Testing — •Jonas Kutschmann1,2, Thomas Pretorius2, Andreas Offergeld2, Andreas Kern2, 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
Mechanical properties of different microstructures of steels are characterized by micro tensile tests and compared to other mechanical testing methods. Out of the heavy plates, provided by thyssenkrupp, miniaturized specimens with a dog-bone shape contour were cut. The specimen dimensions are of constant gauge length of 4 mm, with a gauge width between 0.3 mm and 0.5 mm and a gauge thicknesses between 1.5 mm and 0.05 mm. The depth profile of the heavy plates are correlated to mechanical properties. The thickness of the specimens has been varied over a considerable range to verify an occurring specimen size effect.
The tensile test results are correlated to Vickers hardness measurements, average grain sizes by EBSD and macro tensile tests for the ultimate tensile strength. All steels show a linear correlation between Vickers hardness and tensile strength. Micro testing of the steels reproduce the macro-scale results well. The tensile strength is almost unaffected by down-scaling of the thickness for small grain sizes. In contrast, the fracture strain decreases together with decreasing dimension.