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Difference in corrosion fatigue behavior between Ti-5Ta alloy and zirconium in boiling nitric acid

沸騰硝酸溶液中でのTi-5Ta合金とジルコニウムの腐食疲労挙動の異なり

本岡 隆文; 木内 清

Motooka, Takafumi; Kiuchi, Kiyoshi

硝酸に対して優れた耐食性を有するTi-5Ta合金とジルコニウムは、再処理機器材料に使用されている。しかし、ジルコニウムは応力腐食割れ感受性を有する。応力腐食割れが疲労亀裂成長に与える影響を明らかにするため、17%硝酸溶液中で、Ti-5Ta合金とジルコニウム の疲労亀裂成長挙動を調べた。Ti-5Ta合金は、硝酸中でも大気中とほとんど同じ亀裂成長挙動を示した。破面には、延性ストライエーションが見られた。ジルコニウムは、著しく硝酸中で亀裂が速く進展した。亀裂成長は、擬劈開と塑性変形が相互に関与した割れ形態に影響されていた。硝酸溶液中でのTi-5Ta合金とジルコニウムの疲労亀裂成長の違いは、すべり系と耐食性の違いによるものと考えられた。

Ti-5Ta alloy and zirconium with excellent corrosion resistance to nitric acid have been used as equipment materials in spent fuel reprocessing plants. However, zirconium has the susceptibility to stress corrosion cracking in nitric acid solutions. The fatigue crack growth rates of both metals were examined to clarify the effect of stress corrosion cracking on the fatigue crack growth in boiling 17% nitric acid. The fatigue crack growth behavior of Ti-5Ta alloy in nitric acid showed almost the same behavior as seen in air. The crack growth rate is slightly enhanced in nitric acid. The fracture surface showed the ductile striation with independence on the loading direction. On the other hand, the fatigue crack growth rate of zirconium is remarkably accelerated in nitric acid. The fatigue crack growth was affected by the cracking mode composed of the pseudo-cleavage and plastic deformation. The difference in fatigue cracking behavior on both metals in nitric acid is interpreted with the difference in a cross slip system and the corrosion resistance in nitric acid.

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パーセンタイル:54.69

分野:Materials Science, Multidisciplinary

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