Al合金のSCC強度に及ぼす微小振動応力と材料異方性の影響

概要

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The influences of small vibratory stresses and the loading axis against grain flow directions on the initiation behavior of stress corrosion cracking (SCC) have been investigated on high-strength aluminum alloys sensitive to active path corrosion type SCC. Irrespective of loading directions, the strength of dynamic SCC under a sustained load with small vibratory stresses (>59 MPa) super-imposed was considerably lower than that of static SCC under a sustained load, σ_<SCC>. The static SCC resistance in the TT orientation, where the loading axis is normal to the rolling direction, was superior to that in the LL orientation, where the loading axis is parallel to the rolling direction. Under dynamic loading, on the contrary, the strength in the LL orientation was higher than that in the TT orientation. Static SCC cracks were initiated at intergranular cracks, whereas the initiation sites of dynamic SCC were intergranular cracks, hydrogen-induced {111} plain cleavage fracture, and transgranular cracks associated with corrosion fatigue.
一般社団法人日本機械学会の論文
1986-08-25