Positron annihilation study of neutron-irradiated nuclear reactor pressure vessel steels and their model alloy: Effect of purity on the post-irradiation annealing behavior

A. Kuramoto, Y. Nagai, T. Toyama, T. Takeuchi, M. Hasegawa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Post-irradiation annealing (PIA) behavior of irradiation-induced microstructural changes and hardening of two kind of A533B (first generation (1stGENS: 0.16 wt.% Cu) and second generation (2ndGENS: 0.04 wt.% Cu)) steels after neutron-irradiation of 3.9 × 1019 n cm-2 at 290 °C has been studied by positron annihilation spectroscopy, atom probe tomography and Vickers microhardness measurements. In the 1stGENS, clear two recovery stages are observed: (i) as-irradiated state to 450 °C and (ii) 450 to 600 °C. The first stage is due to annealing out of the most of irradiation-induced vacancy-related defects (VRDs), and the second stage corresponds to dissolving irradiation-induced Cu-rich solute nano-clusters (CRSCs). The experimental hardening is almost twice of the hardening due to the CRSCs estimated by Russell-Brown model below 350 °C, but almost the same as the estimation from 400 to 550 °C. In the 2ndGENS, the VRDs and non-Cu-rich solute nano-clusters (NCRSCs) recover at 450 °C. No CRSC has been formed even in all the annealing process. The experimental hardening is almost twice of the hardening estimated due to the NCRSCs by Russell-Brown model below 400 °C.

Original languageEnglish
Title of host publicationPositron and Positronium Chemistry X
PublisherTrans Tech Publications Ltd
Pages253-257
Number of pages5
ISBN (Print)9783037855188
DOIs
Publication statusPublished - 2013 Jan 1
Event10th International Workshop on Positron and Positronium Chemistry, PPC-10 - Smolenice Castle, Slovakia
Duration: 2011 Sep 52011 Sep 9

Publication series

NameMaterials Science Forum
Volume733
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

Other10th International Workshop on Positron and Positronium Chemistry, PPC-10
CountrySlovakia
CitySmolenice Castle
Period11/9/511/9/9

Keywords

  • Atom probe tomography
  • Irradiation hardening
  • Isochronal annealing
  • Positron annihilation
  • Reactor pressure vessel steels
  • Solute nano-clusters
  • Vacancy-related defects

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Kuramoto, A., Nagai, Y., Toyama, T., Takeuchi, T., & Hasegawa, M. (2013). Positron annihilation study of neutron-irradiated nuclear reactor pressure vessel steels and their model alloy: Effect of purity on the post-irradiation annealing behavior. In Positron and Positronium Chemistry X (pp. 253-257). (Materials Science Forum; Vol. 733). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/MSF.733.257