Effects of varying temperature irradiation on the neutron irradiation hardening of reduced-activation 9Cr-2W martensitic steels

R. Kasada, A. Kimura, H. Matsui, M. Hasegawa, M. Narui

Research output: Contribution to journalConference article

10 Citations (Scopus)

Abstract

In order to clarify the effects of varying temperature during irradiation on the irradiation hardening of 9Cr-2W steels, tensile tests and positron annihilation lifetime measurements were carried out following the varying temperature irradiation (220/420°C and 340/530°C) utilizing a so called multi-section and multi-division controlled irradiation capsule in JMTR. After the irradiation at 220°C to 0.053 dpa, the steels show irradiation hardening as much as 110 MPa. The hardening was almost completely diminished immediately after the elevation of the irradiation temperature to 420°C. Subsequent irradiation at 420°C up to 0.14 dpa did not cause any hardening. The results of positron annihilation lifetime measurements indicate that microvoids are formed by the irradiation at 220°C but disappear upon elevating the temperature to 420°C and are then formed again by the subsequent irradiation at 420°C up to a total dose of 0.14 dpa. This behavior may be interpreted in terms of decomposition of interstitial loops or migration of small interstitial loops during temperature elevation. There is no good correlation between irradiation hardening and formation of microvoids in neutron-irradiated reduced-activation martensitic steels.

Original languageEnglish
Pages (from-to)360-364
Number of pages5
JournalJournal of Nuclear Materials
Volume271-272
DOIs
Publication statusPublished - 1999 May
EventProceedings of the 1997 8th International Conference on Fusion Reactor Materials (ICFRM-8), Part C - Sendai, Jpn
Duration: 1997 Oct 261997 Oct 31

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering

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