Regensburg 2013 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 15: Poster Session
MM 15.58: Poster
Monday, March 11, 2013, 18:00–20:00, Poster E
Characterisation of residual stress in steel components with non-destructive evaluation methods — •Sascha Raatz1, Farid Hendry1, Angga Ginandjar1, Michael Kaack2, Peter Staron3, Michael Hofmann4, and Katharina Theis-Bröhl1 — 1University of Applied Sciences Bremerhaven, 27568 Bremerhaven — 2Salzgitter Mannesmann Forschung GmbH, 47259 Duisburg — 3Helmholtz-Zentrum Geesthacht, 21502 Geesthacht — 4Forschungs-Neutronenquelle Heinz Maier-Leibnitz, 85747 Garching
In industrial application non-destructive evaluation methods are widely used to determine residual stress to prevent failure under load. Magnetic Barkhausen noise (MBN), harmonic analysis and ultrasonic are favoured due to their simple onsite applicability with portable devices. But all those techniques have different limitations and require an independent calibration by an absolute evaluation method like X-ray- and neutron-diffraction. In our study we compare all those techniques to determine the residual stress in steel components. The chosen samples are low-alloy steel pipes with different levels of a straightening process which leaves a visible helix on the surface. This helix is measurable with MBN and harmonic analysis which are sensitive on the skin of the surface. We used synchrotron- and neutron-diffraction to get absolute values in the bulk of our samples. The residual stress correlates with the MBN results, the levels of straightening and changes its value up to 400 MPa through the wall-thickness. We acknowledge funding by BMBF, DESY, FRM II and HZG. The samples were provided by our industrial partner SZMF.