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Long-term high-temperature exposure effects on mechanical properties and structure of the 42XNM alloy after neutron irradiation in the VVER-1000. Part 2. Structural studies
https://doi.org/10.22349/1994-6716-2023-113-1-150-173
Abstract
The paper presents the results of structural studies of ring specimens made of the 42XNM alloy after irradiation as part of the control and protection system of the VVER-1000 reactor to a damaging dose of ~12 dpa at a temperature of ~350°C and subsequent isothermal annealings in the temperature range of 400– 1150°C (heating and holding for ~2 h). It is shown that during long-term isothermal annealing, a change in the phase composition of the alloy is observed, dislocation structures and grain-boundary segregations are annealed, and porosity evolves. It has been confirmed that decrease in the plastic properties of the 42XNM alloy after irradiation and subsequent isothermal annealing in the temperature range of 400–1000°C could be explained by the formation of precipitates of the second phases (zones of discontinuous decomposition of the solid solution with the release of α-Cr particles along the grain boundaries) and pores at the grain boundaries.
About the Authors
B. A. Gurovich
National Research Center “Kurchatov Institute”
Russian Federation
Russian Federation
Dr Sc. (Eng)
1 Akademika Kurchatova Square, 123182 Moscow
A. S. Frolov
National Research Center “Kurchatov Institute”
Russian Federation
Russian Federation
Cand Sc. (Eng)
1 Akademika Kurchatova Square, 123182 Moscow
E. A. Kuleshova
National Research Center “Kurchatov Institute”; National Research Nuclear University MEPhI (Moscow Engineering Physics Institute)
Russian Federation
Russian Federation
Dr Sc. (Eng)
1 Akademika Kurchatova Square, 123182 Moscow
31 Kashirskoe shosse, 115409 Moscow
D. A. Maltsev
National Research Center “Kurchatov Institute”
Russian Federation
Russian Federation
Cand Sc. (Eng)
1 Akademika Kurchatova Square, 123182 Moscow
I. V. Fedotov
National Research Center “Kurchatov Institute”
Russian Federation
Russian Federation
1 Akademika Kurchatova Square, 123182 Moscow
D. V. Safonov
National Research Center “Kurchatov Institute”
Russian Federation
Russian Federation
Cand Sc. (Eng)
1 Akademika Kurchatova Square, 123182 Moscow
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Review
For citations:
Gurovich B.A., Frolov A.S., Kuleshova E.A., Maltsev D.A., Fedotov I.V., Safonov D.V. Long-term high-temperature exposure effects on mechanical properties and structure of the 42XNM alloy after neutron irradiation in the VVER-1000. Part 2. Structural studies. Voprosy Materialovedeniya. 2023;(1(113)):150-173. (In Russ.) https://doi.org/10.22349/1994-6716-2023-113-1-150-173
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