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MM: Fachverband Metall- und Materialphysik
MM 53: Structural Materials (Steels, light-weight materials, high-temperature materials) - II
MM 53.1: Vortrag
Donnerstag, 19. März 2020, 11:45–12:00, BAR 205
Impact of Microstructural Engineered Steels on Micro Tensile Testing — •Jonas Kutschmann1, Thomas Pretorius2, Andreas Offergeld2, and Gerhard Wilde1 — 1Institute of Materials Physics, Westfälische 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 have a constant gauge length of 4mm, the gauge cross-section has a dimension of around 0.5 x 0.5mm2. The microstructure was modified by annealing treatment. 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. The Hall-Petch relation generally states that an increasing grain size leads to a lower yield strength. A critical grain size is reached when the average grain size gets close to the cross-section dimensions of the gauge. Possible deviations from the linear behavior of the Hall-Petch relation or a more pronounced decrease in yield strength in that regime are discussed.