Effects of nickel addition on microstructural evolution and mechanical properties of reduced activation martensitic steels irradiated in the ATR-A1

Ryuta Kasada, Akihiko Kimura

研究成果: Article査読

13 被引用数 (Scopus)

抄録

Validity of nickel isotope tailoring (NIT) method to be able to generate a large amount of transmutation helium in 9%Cr-2%W reduced activation ferritic (RAF) steel for fusion reactor structural material was investigated and discussed through mechanical properties and microstructural evolution after fission neutron irradiation. Miniature tensile and Charpy impact specimens of RAF steels and 1% nickel added RAF steel were irradiated in the ATR-A1 to evaluate irradiation hardening and shift in ductile-brittle transition temperature (ΔDBTT). The amount of transmutation helium in all the RAF steels with and without nickel addition was calculated as only about 0.6 appm. After irradiation at 621 K, the ΔDBTT for the 1% nickel added steel was similar for the JLF-1. After irradiation at 543 K, however, the ΔDBTT for the 1% nickel added steel was significantly larger than that for the JLF-1. Microstructure observations revealed that irradiation-induced dislocation loops in the 1% nickel added steel were finer and denser than in the RAF steel without nickel addition, suggesting that the nickel addition to the RAF steels directly affected nucleation and growth processes of dislocation loops and enhanced irradiation hardening and embrittlement. Therefore, there is a limit in the NIT method as a simulation method for understanding effects of helium on irradiation embrittlement of RAF steels.

本文言語English
ページ(範囲)475-480
ページ数6
ジャーナルMaterials Transactions
46
3
DOI
出版ステータスPublished - 2005 3月
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

フィンガープリント

「Effects of nickel addition on microstructural evolution and mechanical properties of reduced activation martensitic steels irradiated in the ATR-A1」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル