The micro structural study of 15Kh2MFA and 15Kh2NMFA reactor pressure vessel steels using positron-annihilation spectroscopy, mössbauer spectroscopy and transmission electron microscopy

1998 ◽  
Vol 186 (3) ◽  
pp. 323-342 ◽  
Author(s):  
V. Slugeň ◽  
V. Magula
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Positron Annihilation ◽  
Structural Study ◽  
Pressure Vessel ◽  
Positron Annihilation Spectroscopy ◽  
Reactor Pressure Vessel ◽  
Transmission Electron ◽  
Pressure Vessel Steels ◽  
Reactor Pressure

The Clustering of Cu Atoms in Neutron Irradiated Reactor Pressure Vessel Steels Studied by Positron Annihilation

2008 ◽  
Vol 273-276 ◽  
pp. 81-86
Author(s):  
Jakub Čížek ◽  
Ivan Procházka ◽  
Jan Kocik
Keyword(s):  
Positron Annihilation ◽  
Pressure Vessel ◽  
Nuclear Power ◽  
Positron Annihilation Spectroscopy ◽  
Reactor Pressure Vessel ◽  
Maximum Diameter ◽  
Pressure Vessel Steels ◽  
Positron Lifetime Spectroscopy ◽  
Complementary Techniques ◽  
Reactor Pressure

Defect studies of neutron-irradiated Cr-Mo-V (VVER-440) type reactor pressure vessel steels were performed in the present work. The steels were irradiated in the nuclear power plant reactor under the conditions of a regular operation. Characterization of the irradiation induced defects was performed by two complementary techniques of positron annihilation spectroscopy: (i) positron lifetime spectroscopy was used for identification of defects and determination of defect densities, (ii) coincidence Doppler broadening was employed for investigation of Cu atom aggregates. Long range diffusion of Cu atoms is assisted by the irradiation induced vacancies. The solute Cu atoms form small clusters in the irradiated steels. Subsequent isochronal annealing of the irradiated steel leads to vacancy assisted clustering of Cu atoms and formation of small precipitates. The Cu clusters exhibit maximum diameter at 400oC. Above this temperature the clusters dissolve again in the matrix.

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