Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf
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Investigation of the Development of Irradiation - Induced Precipitates in VVER-440-Type Reactor Pressure Vessel Steels and Weld Metals During Irradiation and AnnealingGroße, M.; Nitzsche, P.; Böhmert, J.; Brauer, G.
The development of irradiation-induced precipitates in VVER-440 type reactor pressure vessel steels 15Kh2MFA and weld metals SV-10KhMFT during irradiation and post-irradiation annealing is studied by small angle neutron and X-ray scattering. The kinetic conditions for the precipitation of particles, which already exist in the unirradiated state, seem to be improved at temperatures of about 270 °C due to the irradiation. The size distribution of the irradiation-induced precipitates depends on the copper content and differs between weld and base metal. A strong correlation between the formation of irradiation-induced precipitates and the irradiation hardening is found. The hardness nearly linearly depends on the number of these precipitates.
18th International Symposium "Effects of Radiation in Materials", Hyannis (USA), June 25 - 27, 1996, ASTM STP 1325