TY - CONF A1 - Stegemann, Robert A1 - Sonntag, Nadja A1 - Kreutzbruck, Marc A1 - Skrotzki, Birgit T1 - Self-magnetic-leakage field detection using GMR sensor technology T2 - 11th European Conference on Non-Destructive Testing (ECNDT 2014) T2 - 11th European Conference on Non-Destructive Testing (ECNDT 2014) CY - Prague, Czech Republic DA - 2014-10-06 PY - 2014 AN - OPUS4-31616 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Stegemann, Robert A1 - Sonntag, Nadja A1 - Kreutzbruck, Marc A1 - Skrotzki, Birgit T1 - Self-magnetic-leakage field detection using megneto-optical sensor technique T2 - 2nd International Symposium on Fatigue Design & Material Defects (FDMD II) T2 - 2nd International Symposium on Fatigue Design & Material Defects (FDMD II) CY - Paris, France DA - 2014-06-11 PY - 2014 AN - OPUS4-31617 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Sonntag, Nadja A1 - Stegemann, Robert A1 - Skrotzki, Birgit A1 - Kreutzbruck, Marc ED - Grellmann, W. ED - Frenz, H. T1 - Verformungsinduzierte Magnetisierung ferromagnetischer Stähle am Beispiel eines unlegierten Baustahls T2 - Tagung Werkstoffprüfung 2014 - Fortschritte in der Werkstoffprüfung für Forschung und Praxis - Werkstoffeinsatz, Qualitätssicherung und Schadensanalyse T2 - Tagung Werkstoffprüfung 2014 - Fortschritte in der Werkstoffprüfung für Forschung und Praxis - Werkstoffeinsatz, Qualitätssicherung und Schadensanalyse CY - Berlin, Germany DA - 2014-12-04 KW - MMM KW - 3D-GMR-Magnetometer KW - Topografie KW - Verformungsinduzierte Magnetisierung KW - Baustahl KW - 3D-GMR magnetometer KW - Topography KW - Deformation-induced magnetization KW - Construction steel PY - 2014 SN - 978-3-9814516-8-9 SN - 1861-8154 SP - 355 EP - 360 AN - OPUS4-32222 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Stegemann, Robert A1 - Sonntag, Nadja A1 - Kreutzbruck, Marc A1 - Skrotzki, Birgit ED - Brune, M. ED - Buffière, J.Y. ED - Morel, F. ED - Nadot, Y. T1 - Self-magnetic-leakage field detection using magneto-optical sensor technique T2 - FDMDII-JIP 2014 - 14th International spring meeting - MATEC Web of conferences (Proceedings) N2 - Measurement of spontaneous magnetic stray field signals has been reported to be a promising tool for capturing macro-scale information of deformation states, defects and stress concentration zones in a material structure. This paper offers a new method for self-magnetic leakage field detection using a magneto-optical (MO) hand-held microscope. Its sensor has a dynamic field range between ±0.05 and ±2 kA/m and a lateral optical resolution of approx. 10 µm. We examined flat tensile test specimens of metastable austenitic steel AISI 304. Static tensile tests were repeatedly interrupted at various predetermined states of strain and the magnetic information was measured by the MO system. Comparative measurements using a high-precision magnetic field GMR-sensor, verify the outstanding capability of the MO microscope regarding spatial resolution of magnetic fields. T2 - FDMDII-JIP 2014 - 14th International spring meeting CY - Paris, France DA - 06.11.2014 KW - Magneto-optical sensor KW - Metal magnetic memory KW - GMR KW - NDT PY - 2014 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-326911 SN - 978-2-7598-1274-5 DO - https://doi.org/10.1051/matecconf/20141204010 N1 - Serientitel: Materials science, Engineering and Chemistry – Series title: Materials science, Engineering and Chemistry VL - 12 SP - 04010-1 EP - 04010-3 PB - EDP Sciences AN - OPUS4-32691 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Stegemann, Robert A1 - Sonntag, Nadja A1 - Sharatchandra, W. A1 - Kreutzbruck, Marc A1 - Skrotzki, Birgit T1 - Ein Blick auf die Metal Magnetic Memory Methode durch die Lupe hochauflösender GMR Sensorik T2 - DACH Jahrestagung 2015 T2 - DACH Jahrestagung 2015 CY - Salzburg (Österreich) DA - 2015-05-11 PY - 2015 AN - OPUS4-34897 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Schymura, M. A1 - Stegemann, Robert A1 - Fischer, A. T1 - Crack propagation behavior of solution annealed austenitic high interstitial steels JF - International Journal of Fatigue N2 - Austenitic stainless steels provide a beneficial combination of chemical and mechanical properties and have been used in a wide field of applications for over 100 years. Further improvement of the chemical and mechanical properties was achieved by alloying nitrogen. But the solubility of N within the melt is limited and can be increased in substituting Ni by Mn and melting under increased pressure. In order to avoid melting under pressure and decrease production costs, a part of N can also be substituted by C. This leads to austenitic high interstitial steels (AHIS). Within the solution annealed state strength and ductility of AHIS is comparable or even higher of those of AHNS and can be further improved by cold working. Unfortunately the endurance limit does not follow this trend as it is known from cold-worked austenitic CrNi steels. This is due to the differences of the slip behavior which is governed by the stacking fault energy as well as other near field effects. Construction components operating under cyclic loads over long periods of time cannot be considered being free of voids or even cracks. Thus the crack propagation behavior is of strong interest as well. This contribution presents the tensile, fatigue, crack propagation and fracture toughness properties of AHNS and AHIS in comparison to those of CrNi-steels. The differences are discussed in relation to microstructural characteristic as well as their alterations under cyclic loading. KW - Austenitic high interstitial steel KW - Fatigue KW - Stable crack propagation KW - Planar slip PY - 2015 DO - https://doi.org/10.1016/j.ijfatigue.2015.04.014 SN - 0142-1123 VL - 79 SP - 25 EP - 35 PB - Elsevier Ltd. CY - Oxford AN - OPUS4-32436 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Stegemann, Robert A1 - Lyamkin, Viktor A1 - Cabeza, Sandra A1 - Bruno, Giovanni T1 - Characterization of Residual Stress State on Intert Gas Welded Joints by Neutron Diffraction at E3 line T2 - 7th joint BER II and BESSY II User Meeting T2 - 7th joint BER II and BESSY II User Meeting CY - Berlin DA - 2015-12-11 PY - 2015 AN - OPUS4-35070 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Stegemann, Robert A1 - Sonntag, Nadja A1 - Sharatchandra Singh, W. A1 - Kreutzbruck, Marc A1 - Skrotzki, Birgit T1 - Ein Blick auf die Metal Magnetic Memory Methode nach ISO 24497 durch die Lupe hochauflösender GMR-Sensorik T2 - DACH-Jahrestagung 2015 N2 - Die Messung spontaner magnetischer Streufelder ferromagnetischer Materialien wird als neue, Metal Magnetic Memory (MMM) genannte, Methode der zerstörungsfreien Prüfung (ZfP) angesehen, Schädigungen frühzeitig vorherzusagen. Die MMM Methode versucht, die sich gleichzeitig mit der Schadensentwicklung ausbildende lokale magnetische Struktur für die ZfP zu nutzen und zwar schon vor der eigentlichen Rissinitiierung. Das zugehörige Regelwerk ISO 24497 verspricht neben der Detektion von Mikrorissen und Inhomogenitäten des Werkstoffgefüges auch die Bestimmung des (Eigen-) Spannungszustandes. Neue, an der Bundesanstalt für Materialforschung und -prüfung für die ZfP angepasste GMR (Giant Magneto Resistance)-Sensorik erlaubt Magnetfeldmessungen mit einer Ortsauflösung im Mikrometerbereich. Mit höherer Ortsauflösung zeigen sich Unterschiede, jedoch keine Widersprüche zu bisher publizierten Daten. Ihnen wesentlich ist, dass es einige verwertbare Hinweise auf einen Zusammenhang von Restfeldmagnetisierung und Materialeigenschaften gibt. T2 - DACH-Jahrestagung 2015 CY - Salzburg, Austria DA - 11.05.2015 KW - GMR KW - Metal Magnetic Memory KW - ZfP KW - Materialwissenschaft PY - 2015 SN - 978-3-940283-68-9 IS - DGZfP BB 152 SP - Poster 1, 1 EP - 8 AN - OPUS4-33728 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Stegemann, Robert A1 - Sonntag, Nadja A1 - Sharatchandra, W. A1 - Kreutzbruck, Marc A1 - Skrotzki, Birgit T1 - Ein Blick auf die Metal Magnetic Memory Methode durch die Lupe hochauflösender GMR Sensorik T2 - DACH Jahrestagung 2015 T2 - DACH Jahrestagung 2015 CY - Salzburg (Österreich) DA - 2015-05-11 PY - 2015 AN - OPUS4-33680 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Pelkner, Matthias A1 - Pohl, Rainer A1 - Erthner, Thomas A1 - Stegemann, Robert A1 - Kreutzbruck, Marc A1 - Sergeeva-Chollet, N. T1 - Eddy current testing with high-spatial resolution probes using MR arrays as receiver T2 - 7th International symposium on NDT in aerospace (Proceedings) N2 - Magneto-resistive (MR) sensor arrays are suited for high resolution eddy current testing (ET) of aerospace components due to two significant advantages compared to conventional coil systems. First, to obtain high spatial resolution they can be manufactured down to the µm-regime without losing their outstanding field sensitivity. Secondly, MR technology has a relatively frequency-independent sensitivity in the range of common ET-frequencies thus providing a benefit for low frequency applications. This paper presents measurements using MR array probes consisting of 32 TMR-elements (tunnel magneto resistance), an ASIC, and subsequent readout components. A source for generating the eddy currents inside the material under test is also implemented onboard of the PCB. These probes were developed in the IMAGIC-project* for detection and imaging of surface breaking defects. The performance of the new sensor system has been investigated for several mock-ups, Aluminum and Titanium plate specimens having small adjacent boreholes with diameter of 0.44 mm and micro notches in the µm-range, respectively. To compare our results we used conventional eddy current probes. The MR sensor elements have a length of around 60 µm leading to a nearly 'point like' measurement. Neighbouring boreholes (depth 0.25 mm) with a separation of 0.6 mm between their centres could be resolved with a good SNR, and more important, the boreholes could be confidently distinguished using the TMR-probes. In case of conventional probes a reliable separation was not possible. In this paper we present the MR-ET-probes of the IMAGIC consortium and a comparison with conventional techniques. *The IMAGIC-project ('Integrated Magnetic imagery based on spIntronics Components', 2011 – 2014, project reference: 288381) was funded by the European Commission, Seventh Framework Programme. Further partners involved in the consortium beside BAM and CEA were INESC-ID and INESC-MN (Portugal), Sensitec GmbH (Germany), Tecnatom S.A. (Spain), and Airbus Group (France). T2 - 7th International symposium on NDT in aerospace CY - Bremen, Germany DA - 16.11.2015 KW - TMR KW - GMR KW - Sensor array KW - Eddy current testing (ET) KW - Aerospace PY - 2015 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-344254 SN - 978-3-940283-76-4 N1 - Serientitel: DGZfP-Proceedings – Series title: DGZfP-Proceedings IS - DGZfP-BB 156 SP - We.5.A.4, 1 EP - 8 PB - Deutsche Gesellschaft für Zerstörungsfreie Prüfung e.v. (DGZfP) AN - OPUS4-34425 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -