Microstructural changes in a Russian-type reactor weld material after neutron irradiation, post-irradiation annealing and re-irradiation studied by atom probe tomography and positron annihilation spectroscopy

A. Kuramoto, T. Toyama (Corresponding Author), Y. Nagai, K. Inoue, Y. Nozawa, M. Hasegawa, Matti Valo

Research output: Contribution to journalArticleScientificpeer-review

16 Citations (Scopus)

Abstract

We present a microstructural study of a surveillance test specimen from a reactor pressure vessel steel of a Russian-type nuclear reactor after neutron irradiation, post-irradiation annealing and re-irradiation, using atom probe tomography (APT) and positron annihilation spectroscopy (PAS). The APT results showed the formation of Cu-rich solute nano-clusters (CRCs) during the initial irradiation and their subsequent coarsening during annealing. After re-irradiation, new CRCs have been observed. The irradiation-hardening almost recovered during annealing. However, by re-irradiation, hardening comparable to that by the initial irradiation was observed. The hardening due to the CRCs formed during the initial irradiation, estimated using the Russell–Brown model, was almost the same as that observed. However, the estimated hardening after the re-irradiation was about half of the measured one. The other hardening is attributed to the newly formed MDs by the re-irradiation, which was evidenced by PAS.
Original languageEnglish
Pages (from-to)5236-5246
JournalActa Materialia
Volume61
Issue number14
DOIs
Publication statusPublished - 2013
MoE publication typeA1 Journal article-refereed

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Positron annihilation spectroscopy
Neutron irradiation
Tomography
Welds
Irradiation
Annealing
Atoms
Hardening
Coarsening
Steel structures
Nuclear reactors

Keywords

  • atom probe tomography
  • ferritic steel
  • irradiation embrittlement
  • positron annhilation

Cite this

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title = "Microstructural changes in a Russian-type reactor weld material after neutron irradiation, post-irradiation annealing and re-irradiation studied by atom probe tomography and positron annihilation spectroscopy",
abstract = "We present a microstructural study of a surveillance test specimen from a reactor pressure vessel steel of a Russian-type nuclear reactor after neutron irradiation, post-irradiation annealing and re-irradiation, using atom probe tomography (APT) and positron annihilation spectroscopy (PAS). The APT results showed the formation of Cu-rich solute nano-clusters (CRCs) during the initial irradiation and their subsequent coarsening during annealing. After re-irradiation, new CRCs have been observed. The irradiation-hardening almost recovered during annealing. However, by re-irradiation, hardening comparable to that by the initial irradiation was observed. The hardening due to the CRCs formed during the initial irradiation, estimated using the Russell–Brown model, was almost the same as that observed. However, the estimated hardening after the re-irradiation was about half of the measured one. The other hardening is attributed to the newly formed MDs by the re-irradiation, which was evidenced by PAS.",
keywords = "atom probe tomography, ferritic steel, irradiation embrittlement, positron annhilation",
author = "A. Kuramoto and T. Toyama and Y. Nagai and K. Inoue and Y. Nozawa and M. Hasegawa and Matti Valo",
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Microstructural changes in a Russian-type reactor weld material after neutron irradiation, post-irradiation annealing and re-irradiation studied by atom probe tomography and positron annihilation spectroscopy. / Kuramoto, A.; Toyama, T. (Corresponding Author); Nagai, Y.; Inoue, K.; Nozawa, Y.; Hasegawa, M.; Valo, Matti.

In: Acta Materialia, Vol. 61, No. 14, 2013, p. 5236-5246.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Microstructural changes in a Russian-type reactor weld material after neutron irradiation, post-irradiation annealing and re-irradiation studied by atom probe tomography and positron annihilation spectroscopy

AU - Kuramoto, A.

AU - Toyama, T.

AU - Nagai, Y.

AU - Inoue, K.

AU - Nozawa, Y.

AU - Hasegawa, M.

AU - Valo, Matti

PY - 2013

Y1 - 2013

N2 - We present a microstructural study of a surveillance test specimen from a reactor pressure vessel steel of a Russian-type nuclear reactor after neutron irradiation, post-irradiation annealing and re-irradiation, using atom probe tomography (APT) and positron annihilation spectroscopy (PAS). The APT results showed the formation of Cu-rich solute nano-clusters (CRCs) during the initial irradiation and their subsequent coarsening during annealing. After re-irradiation, new CRCs have been observed. The irradiation-hardening almost recovered during annealing. However, by re-irradiation, hardening comparable to that by the initial irradiation was observed. The hardening due to the CRCs formed during the initial irradiation, estimated using the Russell–Brown model, was almost the same as that observed. However, the estimated hardening after the re-irradiation was about half of the measured one. The other hardening is attributed to the newly formed MDs by the re-irradiation, which was evidenced by PAS.

AB - We present a microstructural study of a surveillance test specimen from a reactor pressure vessel steel of a Russian-type nuclear reactor after neutron irradiation, post-irradiation annealing and re-irradiation, using atom probe tomography (APT) and positron annihilation spectroscopy (PAS). The APT results showed the formation of Cu-rich solute nano-clusters (CRCs) during the initial irradiation and their subsequent coarsening during annealing. After re-irradiation, new CRCs have been observed. The irradiation-hardening almost recovered during annealing. However, by re-irradiation, hardening comparable to that by the initial irradiation was observed. The hardening due to the CRCs formed during the initial irradiation, estimated using the Russell–Brown model, was almost the same as that observed. However, the estimated hardening after the re-irradiation was about half of the measured one. The other hardening is attributed to the newly formed MDs by the re-irradiation, which was evidenced by PAS.

KW - atom probe tomography

KW - ferritic steel

KW - irradiation embrittlement

KW - positron annhilation

U2 - 10.1016/j.actamat.2013.05.016

DO - 10.1016/j.actamat.2013.05.016

M3 - Article

VL - 61

SP - 5236

EP - 5246

JO - Acta Materialia

JF - Acta Materialia

SN - 1359-6454

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