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Title: Microstructural investigation, using polarized neutron scattering, of a martensitic steel for fusion reactors

Small- and wide-angle polarized neutron scattering has been used to investigate the microstructure of modified martensitic steel DIN 1.4914 (MANET-type) developed as a potential candidate for the first wall of future fusion reactors. The nuclear-magnetic interference term and the comparison of the size distribution functions, obtained from the nuclear and from the magnetic scattering components, show that for quench temperatures lower than 1200 C three kinds of microstructural inhomogeneities can be identified: (a) tiny C-Cr elementary aggregates (1 nm or less in size), (b) larger (1--25 nm) Fe-carbides, (c) much larger inhomogeneities arising either from M{sub 23}C{sub 6} precipitates or from fluctuations in the Cr distribution. The scattering data are also compared with those previously obtained on the same samples from a conventional SANS instrument and the influence of the available Q-range on the accuracy of the obtained size distribution functions is discussed.
Authors:
 [1] ; ;  [2] ;  [3]
  1. ENEA, Rome (Italy)
  2. GKSS, Geesthacht (Germany)
  3. ENEA, Bologna (Italy)
Publication Date:
OSTI Identifier:
665199
Resource Type:
Journal Article
Resource Relation:
Journal Name: Acta Materialia; Journal Volume: 46; Journal Issue: 15; Other Information: PBD: 18 Sep 1998
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 70 PLASMA PHYSICS AND FUSION; MICROSTRUCTURE; MARTENSITIC STEELS; THERMONUCLEAR REACTORS; SMALL ANGLE SCATTERING; NEUTRONS; PRECIPITATION; PARTICLE SIZE