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The nELBE Neutron Time of Flight Facility
A. R. Junghans,E. Altstadt,R. Beyer,E. Birgersson,T. Cowan,A. Ferrari,R. Hannaske,A. Matic,K. D. Schilling,R. Schlenk,S. Schneider,R. Schwengner,A. Wagner,F. -P. Weiss,D. Gehre,E. Grosse 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
At the superconducting electron linear accelerator ELBE at Forschungszentrum Dresden-Rossendorf the neutron time-of-flight facility nELBE has become operational. Fast neutrons in the energy range from 200 keV to 10 MeV are produced by the pulsed electron beam from ELBE impinging on a liquid lead circuit as a radiator. The short beam pulses of 10 ps provide the basis for an excellent time resolution for neutron time-of-flight experiments, giving an energy resolution of about <1% at 1 MeV with a short flight path of 5 m. The neutron intensity on target is ∼4·10^4 n/(cm^2 s) using an electron bunch charge of 77 pC and 100 kHz pulse repetition rate. The energy range of the neutrons produced is well suited for neutron cross section measurements relevant for the development of Generation IV reactor systems and for the transmutation of nuclear waste. First measurements of inelastic neutron scattering cross sections have been performed and will be presented.
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Javier Vivas,Carlos Capdevila,Eberhard Altstadt,Mario Houska,Ilchat Sabirov,David San‑Martín 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.2
The microstructural degradation and the creep fracture behavior of conventionally and thermomechanically treated Grade91 steel were investigated after performing small punch creep tests. A remarkable reduction in creep ductility was observedfor the samples thermomechanically treated in comparison to those conventionally treated under the tested conditions ofload (200 N) and temperature (700 °C). A change in the fracture mechanism from a ductile transgranular fracture to a brittleintergranular fracture was observed when changing from the conventionally treated to the thermomechanically treated processingcondition, leading to this drop in creep ductility. The change in the fracture mechanism was associated to the localizedconcentration of creep deformation, close to coarse M23C6carbides, at the vicinity of prior austenite grain boundaries(PAGB) in the thermomechanically treated samples. The preferential recovery experienced at the vicinity of PAGB producedthe loss of the lath structure and the coarsening of the M23C6precipitates. The electron microscopy images provided suggestthat the creep cavities nucleate in these weak recovered areas, associated to the presence of coarse M23C6. After the coalescenceof the cavities the propagation of the cracks was facilitated by the large prior austenite grain size produced during theaustenitization which favors the propagation of the cracks along grain boundaries triggering the intergranular brittle fracture. This fracture mechanism limits the potential use of the proposed thermomechanical processing routes.
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