Radiation induced solute clustering in high-Ni reactor pressure vessel steel

The thermal stability and the structure of solute-vacancy clusters formed by neutron irradiation are studied by means of positron annihilation spectroscopy and hardness measurements of post-irradiation annealed reactor pressure vessel steels with high and low Ni contents. Two distinct recovery stage...

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Bibliographic Details
Published in:Acta materialia 2019-10, Vol.179, p.183-189
Main Authors: Konstantinović, M.J., Uytdenhouwen, I., Bonny, G., Castin, N., Malerba, L., Efsing, P.
Format: Article
Language:English
Subjects:
High Ni RPV steel
Kärnenergiteknik
Neutron irradiation
Nuclear Engineering
Positron annihilation
Vacancy-solute clusters
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Summary:The thermal stability and the structure of solute-vacancy clusters formed by neutron irradiation are studied by means of positron annihilation spectroscopy and hardness measurements of post-irradiation annealed reactor pressure vessel steels with high and low Ni contents. Two distinct recovery stages were observed and assigned to (a) the dissolution of vacancy clusters at about 650 K, and (b) the dissolution of solute-vacancy clusters at about 750 K. In steels with high Ni content, hardening mainly recovers during the second stage. Atomistic and coarse grain models suggest that during this stage, the removal of vacancies from vacancy-solute clusters leads to complete cluster dissolution, which indicates that solute clusters are radiation induced. [Display omitted]
ISSN:1359-6454
1873-2453
1873-2453
DOI:10.1016/j.actamat.2019.08.028