Magnetic properties of a highly neutron-irradiated nuclear reactor pressure vessel steel |
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| Authors: | S. Kobayashi F. Gillemot Á. Horváth R. Székely |
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| Affiliation: | 1. NDE and Science Research Center, Faculty of Engineering, Iwate University, Morioka 020-8551, Japan;2. Hungarian Academy of Science, KFKI Atomic Energy Research Institute, H-1525 Budapest 114, Hungary;1. Materials Department, CONICET-CNEA, Godoy Cruz 2290-C1425FQB CABA, Argentina;2. Material Science and Technology Division, MST-8, Los Alamos National Laboratory, Los Alamos, 87545 NM, USA;3. EDF–R&D, MM - Avenues des Renardières, 77680 Moret sur Loing, France;4. Nuclear Materials Institute, Structural Materials Expert Group–SCK?CEN, Boeretang 200, 2400 Mol, Belgium;1. Institute of Nuclear and Physical Engineering, Slovak University of Technology, Ilkovi?ova 3, 81219 Bratislava, Slovakia;2. AREVA NP GmbH, Paul Gossen Strasse 100, 91 001 Erlangen, Germany;3. Universität der Bundeswehr, Neubiberg, Germany;1. EDF-R&D, Département Matériaux et Mécanique des Composants (MMC), Les Renardières, F-77818 Moret sur Loing Cedex, France;2. Unité Matériaux et Transformations (UMET), UMR CNRS 8207, Université de Lille 1, ENSCL, F-59655 Villeneuve d’Ascq Cedex, France;3. Laboratoire Commun EDF-CNRS Etude et Modélisation des Microstructures pour le Vieillissement des Matériaux (EM2VM), France;1. Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, 01328 Dresden, Germany;2. Centre for Energy Research of the Hungarian Academy of Sciences, 29-33 Konkoly-Thege street, 1121 Budapest XII, Hungary;3. Division of Materials, CIEMAT, Avenida Complutense 22, 28040 Madrid, Spain;4. Wigner Research Center for Physics of the Hungarian Academy of Sciences, 29-33 Konkoly-Thege street, 1121 Budapest XII, Hungary |
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| Abstract: | We report results of minor B–H loop measurements on a highly neutron-irradiated A533B-type reactor pressure vessel steel. A minor-loop coefficient, which is a sensitive indicator of internal stress, changes with neutron fluence, but depends on relative orientation to the rolling direction in the low fluence regime. At a higher fluence of ～10 × 1023 m?2, on the other hand, an anomalous increase of the coefficient was detected irrespective of the orientation. The results were interpreted as due to competing irradiation mechanisms of the formation of Cu-rich precipitates, recovery process, and the formation of late-blooming Mn–Ni–Si-rich clusters. |
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