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Early detection of critical material degradation by means of electromagnetic multi-parametric NDE

 
: Szielasko, Klaus; Tschuncky, Ralf; Rabung, Madalina; Seiler, Georg; Altpeter, Iris; Dobmann, Gerd; Herrmann, Hans-Georg; Boller, Christian

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Preprint urn:nbn:de:0011-n-287055-16 (767 KByte PDF)
MD5 Fingerprint: c5060f71a8e7ccbba0c8ef7b5eab63a9
Copyright AIP
Erstellt am: 20.11.2014


Chimenti, D.E. (Ed.) ; American Society for Nondestructive Testing -ASNT-, Columbus/Ohio:
40th Annual Review of Progress in Quantitative Nondestructive Evaluation 2013. Vol.33A. Pt.2 : Incorporating the 10th International Conference on Barkhausen Noise and Micromagnetic Testing, Volume 33A and 33B, Baltimore, Maryland, 21-26 July 2013
Woodbury, N.Y.: AIP, 2014 (AIP Conference Proceedings 1581)
ISBN: 978-0-7354-1212-5
ISBN: 978-0-7354-1213-2
ISBN: 978-0-7354-1211-8 (4-Vol. Set)
ISBN: 978-1-63266-043-5 (Print-on-Demand)
ISBN: 978-7354-1211-8 (Falsche ISBN!)
S.711-718
Annual Review of Progress in Quantitative Nondestructive Evaluation <40, 2013, Baltimore/Md.>
International Conference on Barkhausen Noise and Micromagnetic Testing <10, 2013, Baltimore/Md.>
Bundesministerium für Wirtschaft und Technologie BMWi
1501269; Kupferausscheidungen
Bundesministerium für Wirtschaft und Technologie BMWi
1501311; Werkstoffermüdung
Bundesministerium für Wirtschaft und Technologie BMWi
1501352; Neutronenversprödung
Bundesministerium für Wirtschaft und Technologie BMWi
1501379; Alterungsmanagement
Englisch
Konferenzbeitrag, Elektronische Publikation
Fraunhofer IZFP ()
electromagnetic; micromagnetic; 3MA; EMAT; ultrasound; time-of-flight; magnetostriction

Abstract
With an increasing number of power plants operated in excess of their original design service life an early recognition of critical material degradation in components will gain importance. Many years of reactor safety research allowed for the identification and development of electromagnetic NDE methods which detect precursors of imminent damage with high sensitivity, at elevated temperatures and in a radiation environment. Regarding low-alloy heat-resistant steel grade WB 36 (1.6368, 15NiCuMoNb5), effects of thermal and thermo-mechanical aging on mechanical-technological properties and several micromagnetic parameters have been thoroughly studied. In particular knowledge regarding the process of copper precipitation and its acceleration under thermo-mechanical load has been enhanced. Whilst the Cu-rich WB 36 steel is an excellent model material to study and understand aging effects related to neutron radiation without the challenge of handling radioactive specimens in a hot cell, actually neutron-irradiated reactor pressure vessel materials were investigated as well. The neutron fluence experienced and the resulting shift of the ductile-brittle transition temperature were determined electromagnetically, and it was shown that weld and base material can be distinguished from the cladded side of the RPV wall. Low-cycle fatigue of the austenitic stainless steel AISI 347 (1.4550, X6CrNiNb18-10) has been characterized with electromagnetic acoustic transducers (EMATs) at temperatures of up to 300 °C. Time-of-flight and amplitude of the transmitted ultrasound signal were evaluated against the number of load cycles applied and observed as an indication of the imminent material failure significantly earlier than monitoring stresses or strains.

: http://publica.fraunhofer.de/dokumente/N-287055.html