ジルカロイ-2のCH3OH/HCl溶液中における応力腐食割れ

概要

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The susceptibility to stress corrosion cracking (SCC) of Zircaloy-2 in CH3OH solutions containing HCl at room temperature was examined fractographically.The weight loss due to intergranular corrosion during stress-free exposure reached the maximum value at a concentration of 0.4% HCl. There occurred a great deal of detrioration of mechanical properties after the exposure. The susceptibility to SCC under a constant load also increased in CH3OH/0.4% HCl solution. The fracture mode was changed from an intergranular into a cleavage-like fracture, and finally into a ductile fracture. A similar tendency was revealed by SCC tests under slow strain rates: At a lower crosshead speed of 1.67×10-1μm/s, all three modes of the intergranular, the cleavage-like, and the ductile fracture were observed.From the evidence mentioned above, a possible cracking mechanism was discussed.
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