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Study of radiation-induced degradation of RPV steels and model alloys by positron annihilation and Mössbauer spectroscopy |
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| Authors: | Andrej Zeman Luigi Debarberis L&#x;udovít Kup a Beatriz Acosta Milo&#x; Kytka Jarmila Degmov |
| Affiliation: | aEuropean Commission, Joint Research Centre, Institute for Energy, P.O. Box 2, 1755ZG Petten, The Netherlands bVÚJE plc., Okru?ná 5, 918 64 Trnava, Slovakia cNuclear Research Institute ?e? plc., Husinec – ?e? 130, 250 68 ?e?, Czech Republic dDepartment of Nuclear Physics and Technology, Slovak University of Technology, Ilkovi?ova 3, 81219 Bratislava, Slovakia |
| Abstract: | The influence of different microstructural processes on the degradation due to radiation embrittlement has studied by positron annihilation and Mössbauer spectroscopy. The materials studied consisted of WWER-440 base (15Kh2MFA) and weld (10KhMFT) RPV steels which were neutron-irradiated at fluence levels of 0.78 × 1024 m?2, 1.47 × 1024 m?2 and 2.54 × 1024 m?2; WWER-1000 base (15Kh2NMFAA) and weld (12Kh2N2MAA) irradiated at a fluence level 1.12 × 1024 m?2; three different model alloys implanted with protons at two dose levels (up to 0.026 dpa), finally the base metal of WWER-1000 (15Kh2NMFAA) was thermally treated with the intention to simulate the P-segregation process. It has been shown possible to correlate the values of parameters obtained by such techniques and data of mechanical testing (ductile-to-brittle transition temperature and upper shelf energy). |
| Keywords: | M0300 P0900 P1200 R0200 |
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