高力アルミニウム合金の食塩水中腐食疲労き裂進展挙動に及ぼす電位と異方性の影響

概要

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Fatigue crack growth tests were made in air and in 3.5% saltwater on 7075-T6 alloy specimens extructed in LT and TL directions. The testing in saltwater was made under the application of anodic and cathodic potentials. The test results showed that the crack growth rate in saltwater was higher than that in air under all the conditions tested, regardless of the applied potential and the specimen orientation. Although an appreciable effect of the applied potential was observed in the lower ΔK_I range of the da/dN-ΔK_I relation for LT specimen, almost no effect of potential was observed in both the da/dN-ΔK_I relation for TL specimen and the da/dN-ΔK_<Ieff> relations for LT and TL specimens. Intergranular fracture and secondary cracking of intergranular type were observed quite often in the LT and TL specimens fatigued under free corrosion.
社団法人日本材料学会の論文
1989-10-15