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MM: Fachverband Metall- und Materialphysik
MM 41: Mechanical Properties II
MM 41.1: Vortrag
Mittwoch, 13. März 2013, 15:00–15:15, H26
Investigation of residual stress in straightened steel pipes with diffraction methods — •Sascha Raatz1, Heike Oppermann1, Peter Staron2, Michael Hofmann3, Michael Kaack4, and Katharina Theis-Bröhl1 — 1University of Applied Sciences Bremerhaven, 27568 Bremerhaven — 2Helmholtz-Zentrum Geesthacht (HZG), 21502 Geesthacht — 3Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II) , 85747 Garching — 4Salzgitter Mannesmann Forschung GmbH (SZMF) , 47259 Duisburg
In our study we compare several non-destructive evaluation methods to determine the residual stress in steel components due to a demand from the industry for reliable on-site testing. The chosen samples are low-alloy steel pipes with different levels of a straightening process which leaves a visible helix on the surface. We used synchrotron diffraction at the HEMS beamline at DESY and neutron diffraction at STRESS-SPEC at the FRM II to get absolute values for the residual stress in the bulk of our samples. The samples have a wall-thickness of 4 mm and the measurements show the highest residual stresses approximately 1 mm under the surface. The residual stresses correlate with the levels of straightening and change their values up to 400 MPa through the wall-thickness.
We acknowledge funding by BMBF, DESY, FRM II and cooperation with HZG. The samples were provided by our industrial partner SZMF.