Book/Report

FZJ-2016-04916

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Beitrag zum Hochtemperaturverformungsverhalten des austenitischen Stahls 1.4981 nach Neutronenbestrahlung

Thiele, B. (Corresponding author)FZJ* ; Schubert, F.FZJ* ; Nickel, H.FZJ*

1984
Kernforschungsanlage Jülich GmbH, Zentralbiliothek, Verlag Jülich

Please use a persistent id in citations: http://hdl.handle.net/2128/12369

Report No.: Juel-1904

Abstract: The austenitic steel 1.4981 thermomechanically treated to provide a range of microstructures has been irradiated at temperatures of 400-500 °C with neutron fluxes of 1,55 x 10$^{23}$ to 3 x 10$^{25}$ m$^{-2}$. The degree of high temperature helium embrittiement caused by (n, $\alpha$) nuclear reactions was determined in post-irradiation tensile and stress rupture tests at temperatures in the range 400-850 °C. Under the irradition conditions used, the production of helium within the grains was so great that the helium concentration at grain boundaries which leads to ductility loss was controlled by the diffusion of helium. At test temperatures below 700 °C, the difference in the duration of tensile and of stress rupture tests has a significant effect. The test results show that the microstructural variations of the steel 1 .4981 tested under the same conditions exhibited similar relative ductilityloss. However, the absolute value of the rupture elongation after irradiation was proportional to the ductility of the material in the unirradiated condition, which was in turn dependent on the thermomechanical treatment. Specimens which had been embrittled by helium were found to contain numerous intercrystalline microcracks, which were orientated normal to the stress direction and eventually caused rupture. The elongation of the specimens resulted mainly from the widening of the microcracks ; the grains themselves were not elongated to the same extent as found in unirradiated specimens. This explains why for the irradiated specimens litte or no secondary creep was observed.

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Contributing Institute(s):

1. Publikationen vor 2000 (PRE-2000 ; Retrocat)

Research Program(s):

1. 899 - ohne Topic (POF3-899) (POF3-899)

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