Effects of copper concentration and neutron flux on irradiation hardening and microstructure evolution in Fe-Cu model alloys

Ryuta Kasada, Takeshi Kitao, Kazunori Morishita, Hideki Matsui, Akihiko Kimura

Research output: Contribution to journalConference articlepeer-review

6 Citations (Scopus)

Abstract

Irradiation hardening and microstructure evolution under neutron irradiation have been investigated for pure Fe, Fe-0.15 Cu, Fe-0.28 Cu and Fe-0.46 Cu alloys. All the alloys were annealed at 780°C for 20 min and quenched in iced water. Neutron irradiations were performed in the Japan Material Test Reactor (JMTR) up to a fluence of about 1 × 1022n/m2 at different fluxes (3.0 × 1016 and 1.5 × 1015 n/m2s) at 290°C utilizing a so-called "multi-division temperature control irradiation rig" to investigate flux effects under controlled irradiation temperature and flux. The irradiation hardening increased with increasing copper concentration. Positron annihilation lifetime spectrometry (PAS) revealed that the second lifetime component (τ2) was observed only in pure iron and Fe-0.15 Cu alloy irradiated at the low flux condition. As for the flux effect, the irradiation hardening was larger at the lower flux condition in all the model alloys and A533 B steel. Post-irradiation annealing experiments indicated that there were two recovery stages: the first was above 350°C and the second was around 550°C. The amount of hardening-recovery in the first stage decreased with increasing copper concentration and depended on the flux; a larger recovery was observed at the lower flux condition. In contrast, the amount of recovery in the second stage increased with increasing copper concentration and was independent of the flux. It is considered that the first recovery is related to the annealing out-of-matrix defects and the second one is due to dissolution of copper precipitates. The τ2 of PAS disappeared after the annealing at 350°C, indicating that microvoids decomposed during the annealing.

Original languageEnglish
Pages (from-to)237-246
Number of pages10
JournalInstitution of Chemical Engineers Symposium Series
Issue number148
Publication statusPublished - 2000 Dec 1
Externally publishedYes
EventHazards XVI Analysing the Past, Planning the Future - Manchester, United Kingdom
Duration: 2001 Nov 62001 Nov 8

Keywords

  • A533B
  • Fe-Cu alloys
  • Flux effects
  • Hardening-recovery
  • Irradiation hardening

ASJC Scopus subject areas

  • Chemical Engineering(all)

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