Dresden 2017 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 34: Poster session II

MM 34.42: Poster

Dienstag, 21. März 2017, 18:30–20:30, P4

Observation of the influence of hydrogen on the phase transformation and fracturing behaviour of steel samples during tensile tests using synchrotron radiation — •Beate Pfretzschner, Axel Griesche, and Thomas Schaupp — Bundesanstalt für Materialforschung und -prüfung, Berlin, Deutschland

Hydrogen exhibits a detrimental influence on the mechanical properties of Fe-based alloys. The suggested mechanisms of hydrogen embrittlement are ambiguous and versatile. One of the effects of hydrogen in steels is its ability to change the phase transformation behaviour from austenite to martensite. In this work we present in-situ energy dispersive x-ray diffraction (ED-XRD) experiments performed on supermartensitic stainless steel samples with and without hydrogen during tensile tests. In order to perform ED-XRD scans, the path-controlled tensile test were paused every 0.25 mm. During these pauses spectra were acquired at seven positions on the sample along the tensile axis with a distance of 0.75 mm between each position. This procedure allows to follow the stress- or strain-induced phase transformation of the retained austenite to martensite in-situ. Simultaneous to the diffraction patterns, radioscopic images were acquired during the fracturing of the sample at a rate of 500 fps. Significant differences were observed in the phase transformation behaviour and the fracturing performance between hydrogenous samples and samples without hydrogen.