7N01 Al合金の繰返しSCCき裂進展に及ぼす温度の影響

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タイトル別名
  • The Influence of Temperature on Cyclic SCC Crack Growth in 7N01 Aluminum Alloy
  • 7N01 Al ゴウキン ノ クリカエシ SCC キレツ シンテン ニ オヨボ

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説明

The influences of temperature ranged from 278K to 343K on cyclic SCC crack growth under a low frequency varying load have been investigated on a 7N01 high-strength aluminum alloy in 3.5% NaCl solution which is sensitive to active path corrosion type SCC. The threshold stress intensity factor, KFSCC, at T≤318K is independent of temperature, provided that testing duration is comparably equal. However, the KFSCC values increase in the cases at T=343K and longer testing duration at T=278K. This increase is caused by the corrosion products-induced wedge effects. In Region II, however, crack growth rates increase with increasing temperature in terms of ΔKeff, not in terms of ΔK (Kmax). The apparent activation energies in Region II for cyclic SCC are about 8-10kJ/mol, which are smaller than those for static and dynamic SCC. Applying the summation model based upon fracture area fractions to cyclic SCC crack growth rates, the intergranular crack growth term, (da/dN)AD, and the transgranular hydrogen embrittlement one, (da/dN)HE, have been obtained. At lower temperature, (da/dN)HE is much larger than (da/dN)AD compared with those for dynamic SCC. This is the reason that activation energies for cyclic SCC are so small compared with those of static and dynamic SCC.

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