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Open AccessArticle
Investigation of Irradiation Hardening and Effectiveness of Post-Irradiation Annealing on the Recovery of Tensile Properties of VVER-1000 Realistic Welds Irradiated in the LYRA-10 Experiment
by
Mathilde Laot
Mathilde Laot 1,*,
Viviam Marques Pereira
Viviam Marques Pereira 1,
Theo Bakker
Theo Bakker 1,
Elio d’Agata
Elio d’Agata 2,
Oliver Martin
Oliver Martin 2 and
Murthy Kolluri
Murthy Kolluri 1
1
Nuclear Research & Consultancy Group (NRG), 1755 LE Petten, The Netherlands
2
European Commission, Joint Research Centre, Directorate G—Nuclear Safety & Security, 1755 LE Petten, The Netherlands
*
Author to whom correspondence should be addressed.
Metals 2024, 14(8), 887; https://doi.org/10.3390/met14080887 (registering DOI)
Submission received: 10 June 2024
/
Revised: 16 July 2024
/
Accepted: 1 August 2024
/
Published: 3 August 2024
Abstract
Assessing the embrittlement and hardening of reactor pressure vessel steels is critical for the extension of the service lifetime of nuclear power plants. This paper summarises the tensile test results on the irradiation behaviour of realistic VVER-1000 welds from the STRUMAT-LTO project. The welds were irradiated at the HFR (Petten, the Netherlands) to a fluence of up to 1.087 × 1020 n·cm−2, and their irradiation hardening was studied by means of tensile testing. The four grades, with different Mn and Ni contents, show different hardening behaviours. The highest degree of irradiation hardening is observed for the weld that has the highest combined Ni + Mn content. The results show that there is a synergetic effect of Mn and Ni on the irradiation hardening behaviour of the VVER-1000 welds. Besides irradiation hardening, the effectiveness of post-irradiation annealing treatments on the recovery of the tensile properties is studied in the present work. Post-irradiation annealing treatments conducted at 418 °C and at 475 °C proved to be effective for three of the four investigated welds. For the realistic weld with the highest combined Ni + Mn, only the annealing at 475 °C led to the complete recovery of the tensile properties.
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MDPI and ACS Style
Laot, M.; Marques Pereira, V.; Bakker, T.; d’Agata, E.; Martin, O.; Kolluri, M.
Investigation of Irradiation Hardening and Effectiveness of Post-Irradiation Annealing on the Recovery of Tensile Properties of VVER-1000 Realistic Welds Irradiated in the LYRA-10 Experiment. Metals 2024, 14, 887.
https://doi.org/10.3390/met14080887
AMA Style
Laot M, Marques Pereira V, Bakker T, d’Agata E, Martin O, Kolluri M.
Investigation of Irradiation Hardening and Effectiveness of Post-Irradiation Annealing on the Recovery of Tensile Properties of VVER-1000 Realistic Welds Irradiated in the LYRA-10 Experiment. Metals. 2024; 14(8):887.
https://doi.org/10.3390/met14080887
Chicago/Turabian Style
Laot, Mathilde, Viviam Marques Pereira, Theo Bakker, Elio d’Agata, Oliver Martin, and Murthy Kolluri.
2024. "Investigation of Irradiation Hardening and Effectiveness of Post-Irradiation Annealing on the Recovery of Tensile Properties of VVER-1000 Realistic Welds Irradiated in the LYRA-10 Experiment" Metals 14, no. 8: 887.
https://doi.org/10.3390/met14080887
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