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Void denuded zone formation for Fe-15Cr-15Ni steel and PNC316 stainless steel under neutron and electron irradiations

中性子及び電子線照射下でのFe-15Cr-15Ni及びPNC316におけるボイド欠乏帯の形成

関尾 佳弘; 山下 真一郎; 坂口 紀史*; 高橋 平七郎*

Sekio, Yoshihiro; Yamashita, Shinichiro; Sakaguchi, Norihito*; Takahashi, Heishichiro*

PNC316における空格子の拡散性に及ぼす添加元素の影響を評価するために、粒界近傍で形成される照射誘起ボイド欠乏帯を調べた。供試材として、添加元素を含むPNC316と含まないFe-15Cr-15Ni(モデル合金)を使用し、ボイドの形成が顕著となる照射条件下で中性子照射及び電子線照射が行われた。両鋼種における中性子照射後及び電子線照射後の微細組織観察の結果、両鋼種ともにランダム粒界近傍でボイド欠乏帯が形成され、PNC316において形成されたボイド欠乏帯の幅はFe-15Cr-15Niよりも狭くなることが示された。更に、この両鋼種のボイド欠乏帯幅の違いに着目して、PNC316における空格子の拡散性(特に空格子移動エネルギー)の解析・評価を行った結果、PNC316において空格子の拡散性が低下することが示された。

Irradiation-induced void denuded zone (VDZ) formation near grain boundaries was studied to clarify the effects of minor alloying elements on vacancy diffusivity during irradiation in PNC316 steel. The test materials were Fe-15Cr-15Ni steel without additives and PNC316 stainless steel, which contains minor alloying elements. These steels were neutron-irradiated in the experimental fast reactor JOYO and electron-irradiation was also carried out using 1 MeV high voltage electron microscopy. VDZ formation was analyzed from the TEM microstructural observations after irradiation. VDZs were formed near random grain boundaries in both Fe-15Cr-15Ni and PNC316 steels. The VDZ widths in the PNC316 steel were narrower than those for the Fe-15Cr-15Ni steel for all neutron and electron irradiations. The VDZ width analysis implied that the vacancy diffusivity was reduced in PNC316 steel as a result of interaction of vacancies with minor alloying elements.

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パーセンタイル:22.72

分野:Materials Science, Multidisciplinary

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