Comparison of the high Ni VVER-1000 weld microstructure under the primary irradiation and re-irradiation

Кулешова, Е. А.; Гурович, Б. А.; Fedotova, Svetlana; Zhuchkov, G.M.; Фролов, А. С.; Maltsev, D.A.; Saltykov, M. A.; Dementyeva, M. M.

doi:10.1016/j.jnucmat.2020.152384

Cited by 3 publications

(1 citation statement)

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“…They found that the hardness of the re-irradiated state was higher than that of the initial-irradiated state and inferred that it was due to defects that had not been eliminated by annealing. Kuleshova et al [ 12 ] investigated the microstructural evolution of VVER-1000 RPV steel under the primary irradiation and re-irradiation. They found that the microstructures of the RPV steel after the primary irradiation and re-irradiation after recovery annealing up to the close values of neutron fluences were identical.…”

Section: Introductionmentioning

confidence: 99%

Study on the Re-Aging Behavior of Cu-Rich Precipitates in a FeCu Alloy under Electropulsing

Xia,

Yang,

Gao

et al. 2024

Materials

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The nanoscale Cu-rich precipitates (CRPs) are one of the most critical microstructural features responsible for degrading the mechanical properties of reactor pressure vessel (RPV) steels. The prospect of the rapid regeneration of the service performance of degraded materials through electropulsing is attractive, and electropulsing has been proven to have the application potential to eliminate the CRPs and recover the mechanical properties of RPV materials. However, few studies have investigated the secondary service issue of electropulsing. This paper provides experimental findings from microstructural investigations and property evaluations of a FeCu RPV model alloy subjected to re-aging following recovery electropulsing and annealing treatments. The evolution behavior of CRPs and the changes in the hardness of the alloy during the re-aging process after electropulsing treatment were consistent with the initial aging process, while the re-aging process of the annealing treatment group was quite different from the initial aging. The difference between the electropulsing and annealing treatment groups was that the annealing treatment failed to eliminate the precipitates completely, leaving behind some large precipitates. This work demonstrates the potential application of EPT in this field.

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Section: Introductionmentioning

confidence: 99%