Regensburg 2016 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 28: Topical session: In-situ Microscopy with Electrons, X-Rays and Scanning Probes in Materials Science II - Atomic structure and defects I

MM 28.2: Vortrag

Mittwoch, 9. März 2016, 10:45–11:00, H38

In situ investigation of the microstructure in friction stir welded steels using high-energy X-ray diffraction — •Malte Blankenburg, Peter Staron, Torben Fischer, Norbert Schell, Luciano Bergmann, Jorge F. dos Santos, Norbert Huber, Andreas Schreyer, and Martin Müller — Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Max-Planck-Straße 1, 21502 Geesthacht, Germany

Thermo-mechanical treatments of engineering metallic materials yield non-equilibrium microstructures, which potentially reduce strength and toughness of a joint. As a solid state joining process, friction stir welding reduces the heat input and increases the mechanical properties of the weld. The intermediate stages of phase transformations in the weld zone during the joining process can only be studied by in situ experiments. Therefore, in situ diffraction measurements using a transportable friction stir welding system (FlexiStir) were performed at the HZG high-energy material science beamline (HEMS) at DESY. Due to the high brilliance of the source and a fast PerkinElmer area detector, the investigation of the ferrite and austenite content of a small gauge volume (0.5mm3) with image rates up to 10Hz was possible. Two different steels (S355, 1.4410) were welded using different welding parameters. The results of the Rietveld refinement deliver a spatially resolved insight to the phase transformations taking place in a short distance behind the welding tool (<10mm) and show a correlation to the welding power.

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