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Effect of ion irradiation and implantation of H and He on the corrosion behavior of austenitic stainless steel

オーステナイト・ステンレス鋼腐食挙動へのイオン照射及び水素注入,ヘリウム注入の効果

根本 義之  ; 三輪 幸夫; 加治 芳行 ; 塚田 隆 

Nemoto, Yoshiyuki; Miwa, Yukio; Kaji, Yoshiyuki; Tsukada, Takashi

核破砕中性子源の構造材料として考えられているオーステナイト・ステンレス鋼の照射による腐食挙動の変化を調べるため、高純度Fe-18Cr-12Niを用いて研究を行った。この試料に473-773KでNiイオン照射及びH, He注入を行い、腐食試験を行った。腐食挙動の評価には原子間力顕微鏡を使用した。腐食量は照射損傷量の増加に伴い増加した。また、照射温度の上昇に依存して腐食が大きくなった。そして、H注入は低温では腐食を促進したが高温では腐食を抑制した。また、He注入はいずれの温度条件においても腐食を抑制した。

The aim of this work is to evaluate corrosion behavior of irradiated materials these would be used in spallation neutron sources. Solution annealed high purity Fe-18Cr-12Ni specimens were used in this study. Ni$$^{3+}$$, H+ and He$$^{2+}$$ ions were irradiated at 473 to 773K. After corrosion procedure, the specimens were examined with atomic force microscope (AFM) to evaluate corrosion behavior. It was shown that the corroded volume of irradiated area increased with radiation damage. Higher H content at lower temperature accelerated corrosion, but H at higher temperature did not accelerate corrosion. He suppressed corrosion, and corroded volume was larger for the specimens irradiated at higher temperature than these at lower temperature. It is suggested from this study that H and He affect the corrosion behavior of irradiated alloy.

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パーセンタイル:18.81

分野:Materials Science, Multidisciplinary

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