Two-step recovery process of irradiation hardening in 1%Ni doped 9%Cr-2%W martensitic steel

Ryuta Kasada, Taro Morimura, Hideki Matsui, Minoru Narui, Akihiko Kimura

Research output: Contribution to journalConference articlepeer-review

12 Citations (Scopus)


The effect of nickel addition on irradiation-induced hardening has been investigated for reduced-activation martensitic steel (RAMS). Specimens were irradiated in the JMTR at 80 °C and 220 °C up to 0.15 dpa. There was no significant difference in the tensile properties between the steels with and without Ni addition after the irradiation at 220 °C, while in the case of the irradiation below 170 °C, the Ni-added RAMS showed a more than four times larger irradiation hardening than the steel without Ni addition. The recovery behavior of the irradiation hardening of Ni-added steel on post-irradiation annealing showed two-step recovery behavior; the first step was around 200 °C and the second one was around 350 °C, while only the single step of recovery was observed around 350 °C in the steel without Ni addition. The mechanism of the recovery process of the tremendous irradiation hardening in Ni-added steel is discussed along with the behavior of vacancies, carbon atoms and their complexes investigated by means of positron annihilation lifetime spectrometry.

Original languageEnglish
Pages (from-to)448-459
Number of pages12
JournalASTM Special Technical Publication
Issue number1366
Publication statusPublished - 2000 Dec 1
Externally publishedYes
Event19th International Symposium: Effects of Radiation on Materials - Seattle, WA, USA
Duration: 1998 Jun 161998 Jun 18

ASJC Scopus subject areas

  • Engineering(all)


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