Crack growth in a new nickel-based superalloy at elevated temperature

摘要: Crack growth at elevated temperature has been examined in a new fine-grained nickel-based superalloy under triangular, fast-slow, slow-fast, dwell and sustained loading conditions 650 725∘C. The effect of waveform seems to be minimal for base frequencies over 0.01 Hz with mixture time cycle dependent crack observed all but the fast-slow waveform, where remained cycle-dependent rate mostly constant. For less than Hz, load clearly accelerated rates were comparable those load. Creep contribution was found negligible while tip constraint may relevant out-of-plane predominantly conditions.