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Effect of additional minor elements on accumulation behavior of point defects under electron irradiation in austenitic stainless steels

オーステナイト鋼の電子線照射下照射点欠陥蓄積挙動に及ぼす添加元素の効果

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

316系ステンレス鋼における電子線照射下での点欠陥蓄積挙動に及ぼす添加元素の効果をボイド欠乏帯幅の解析から評価することを目的として、SUS316L及びSUS316Lベースの微量元素添加鋼(V, Zr)に対して電子線照射を行い、各鋼種で形成したボイド欠乏帯幅の解析から、空格子拡散係数、空格子フラックス及び実効空格子濃度を相対評価した。これらの結果、以下のことがわかった。(1)それぞれの鋼種において、ある一定の幅を持ったボイド欠乏帯幅が形成した。(2)ボイド欠乏帯幅は鋼種毎に異なり、添加元素を加えることによってその幅が低下した。(3)SUS316L及びSUS316L-Vのボイド欠乏帯幅の解析から、これらの鋼種間での空格子拡散係数、空格子フラックス及び実効空格子濃度の比を見積もると、Vを加えたことでそれぞれの比は0.50, 0.71, 1.41となり、点欠陥蓄積挙動に及ぼす添加元素の効果を数値的に評価することが可能となることを示唆する結果が得られた。

In order to perform the comparative evaluations for vacancy diffusivity and flux between a base alloy and modified alloys, the void denuded zones (VDZ) widths were measured from the TEM in-situ observation during electron irradiation in the SUS316L, SUS316L-V and SUS316L-Zr steels. As a result, VDZs with given widths were formed near GBs. Then, the VDZ widths were different depending on steels, and the width was narrower due to addition of minor alloying elements which strongly interact with vacancies. Furthermore, from the analyses of measured VDZ widths in the SUS316L and SUS316L-V steels, the changes of vacancy diffusivity, vacancy flux and excess vacancy concentration were estimated as 0.50, 0.71 and 1.41, respectively. The decreases of vacancy diffusivity and flux during electron irradiation would be due to the interaction of vacancies with added minor elements, while the enhancement of the excess vacancy concentration would be caused by trapping effects due to alloying elements.

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パーセンタイル:62.01

分野:Materials Science, Multidisciplinary

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