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Mechanical properties and microstructural stability of advanced ferritic/martensitic steel under irradiation

高強度フェライト/マルテンサイト鋼(PNC-FMS)の照射後強度特性及び組織安定性評価

矢野 康英; 山下 真一郎; 赤坂 尚昭; 渡辺 精一*; 高橋 平七郎

Yano, Yasuhide; Yamashita, Shinichiro; Akasaka, Naoaki; Watanabe, Seiichi*; Takahashi, Heishichiro

PNC-FMS被覆管の照射後引張特性に及ぼす高速中性子照射効果の影響を組織面から調査した。試験片は高速実験炉「常陽」の材料照射リグを用いて照射した。照射温度は、773$$sim$$1013Kで、照射量は11$$sim$$102dpaであった。組織の安定性については、北海道大学超高圧電子顕微鏡を用いた電子線照射試験により中性子照射後の組織との比較検討を行った。

Ferritic/martensitic (F/M) steels are expected to be prospective not only for the long life core material of fast reactors but also for the blanket materials of fusion reactor because of their superior swelling resistance. Japan Atomic Energy Agency has developed a 11Cr-0.5Mo-2W-V, Nb F/M steel (PNC-FMS) for core materials of next fast reactor. In order to evaluate the effect of structural change due to irradiation on mechanical properties of PNC-FMS, neutron irradiations were carried out between 773 and 1013 K to doses of from 11 to 102 dpa in JOYO reactor. Post irradiation tensile tests were performed at 773-1013 K with a strain rate of 0.5$$times$$10$$^{-4}$$/s. The stability of microstructures under irradiation was also compared with those of electron irradiation using HVEM.

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