Berlin 2015 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 51: Mechanical properties II
MM 51.5: Vortrag
Donnerstag, 19. März 2015, 11:15–11:30, TC 010
Investigation of VHCF behavior of an austenitic-ferritic duplex steel during insitu XRD measurements with different load amplitudes — •Anne K. Hüsecken1, Marcus Söker2, Ulrich Krupp2, and Ullrich Pietsch1 — 1Universität Siegen, Siegen, Germany — 2Hochschule Osnabrück, Osnabrück, Germany
The behavior of materials in the region of very high cycle fatigue (VHCF) is not known, yet. Nowadays, with the development of ultrasonic testing machines (BOKU Vienna), it is possible to reach the region over 10 million cycles within a few hours. One of these machines was directly mounted on the diffractometer at beamline BL 10 at DELTA in Dortmund, to investigate the behavior of single grains within the flat dogbone-shaped austenitic-ferritic duplex steel samples (1.4462) during the whole fatigue process of the sample. Therefore Rockingscans were performed after each fatigue step with different load amplitudes, analyse FWHM and peak positions. In former studies we already showed, that it is possible to analyse one single grain by this method [1]. We found, that some grains rotate or change their lattice orientations during fatigue [2]. The analysis and results of these XRD measurements will be presented.
[1] K.Istomin et al., Int. J. of Fatigue 66 (2014), 177-182.
[2] A.K. Hüsecken et al., Procedia Engineering 74 (2014), 53-56.