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Long-term properties of reduced activation ferritic/martensitic steels for fusion reactor blanket system

核融合ブランケットシステム用低放射化フェライト/マルテンサイト鋼の長時間特性

芝 清之; 谷川 博康; 廣瀬 貴規; 酒瀬川 英雄  ; 實川 資朗

Shiba, Kiyoyuki; Tanigawa, Hiroyasu; Hirose, Takanori; Sakasegawa, Hideo; Jitsukawa, Shiro

低放射化フェライト/マルテンサイト鋼F82Hの熱時効特性を400$$sim$$650$$^{circ}$$Cの温度範囲で、最長10万時間まで調べた。熱時効後のミクロ組織,析出物,引張特性,シャルピー衝撃特性等を調べた。Laves相は550$$sim$$650$$^{circ}$$Cの温度範囲で、また、1万時間以上では550$$sim$$650$$^{circ}$$Cの温度範囲でM$$_{6}$$C炭化物が生成した。これらの析出物は特に550$$sim$$650$$^{circ}$$Cの温度範囲で材料の靭性を大きく劣化させた。引張特性への時効の効果は大きくはなかったが、650$$^{circ}$$Cでは1万時間以上の時効で大きな軟化を示した。析出物の増加は延性にも影響を及ぼしたが、深刻な劣化ではなかった。析出物の増加は材料の靭性を大きく劣化させ、特に、650$$^{circ}$$Cでは結晶粒界への粗大なLaves相の析出によりDBTTが大きく上昇した。結晶粒界へのLaves相の析出は延性破壊時の吸収エネルギー(USE)も低下させ、シャルピー衝撃試験の結果から、F82H鋼の使用可能範囲は、550$$^{circ}$$Cで3万時間程度であることが明らかとなった。

Aging properties of reduced activation ferritic/martensitic steel F82H was researched at temperature ranging from 400$$^{circ}$$C to 650$$^{circ}$$C up to 100,000 hr. Microstructure, tensile, and Charpy properties were carried out. Laves was found at temperatures between 550 and 650$$^{circ}$$C and M$$_{6}$$C carbides were found at the temperatures between 500 and 600$$^{circ}$$C over 10,000 hr. These precipitates caused degradation in toughness, especially at temperatures ranging from 550$$^{circ}$$C to 650$$^{circ}$$C. Tensile properties do not have serious aging effect, except for 650$$^{circ}$$C, which caused large softening even after 10.000 hr. Increase of precipitates also causes some degradation in ductility, but it is not critical. Large increase in DBTT caused by the large Laves phase precipitation at grain boundary was observed in the 650$$^{circ}$$C aging. Laves precipitates at grain boundary also degrades the USE of the aged materials. These aging test results provide F82H can be used up to 30,000 hr at 550$$^{circ}$$C.

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パーセンタイル:93.26

分野:Nuclear Science & Technology

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