Dresden 2014 – scientific programme
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MI: Fachverband Mikrosonden
MI 2: Untersuchung von kondensierter Materie mittels Positronen-Annihilation
MI 2.8: Talk
Monday, March 31, 2014, 12:30–12:45, MER 02
Long-term ageing effects in reactor pressure vessel steels investigated by positron annihilation spectroscopy — •Maik Butterling1, Wolfgang Anwand1, Frank Bergner2, Andreas Ulbricht2, Andreas Wagner1, and Arne Wagner2 — 1Helmholtz-Zentrum Dresden-Rossendorf, Institute of Radiation Physics, POB 51 01 19, 01314 Dresden, Germany — 2Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, POB 51 01 19, 01314 Dresden, Germany
Neutron irradiation of reactor pressure vessel steels leads to the formation of nano-sized defects which can deteriorate the material. An understanding of the microstructural evolution of the material is important for making reliable security assessments about possible future long-term operation of nuclear power plants.
So-called late-blooming phases [1-3] are formed after long-term irradiation and lead to considerable material ageing effects. Encouraging factors for the formation of these phases are a low Cu-content, moderate to high contents of Mn and Ni, low irradiation temperatures and different neutron fluxes.
Positron annihilation lifetime spectroscopy which is ideally suited for the detection and characterization of these irradiation-induced defects was applied for different selected materials which fulfill these conditions in order to investigate the occurrence and behavior of these phases.
[1] G.R. Odette, Mater. Res. Soc. Symp. Proc. 373 (1995) 137-148
[2] G.R. Odette and B.D. Wirth, J. Nucl. Mater. 251 (1997) 157
[3] R. Ngaymam-Happy et al., J. Nucl. Mater. 426 (2012) 198-207