Abstract
Corrosion fatigue crack growth rates were measured on compact toughness specimens of ASTM A-471 turbine disc steel in room temperature 12M NaOH solution. The role of cathodic potentials on corrosion fatigue crack growth rates was investigated. Intergranular cracking was observed at cathodic potentials compared to transgranular cracking at open circuit potential and in air. The results suggest a hydrogen embrittlement mechanism of cracking at cathodic potentials. The results suggest that hydrogen diffusion into the material ahead of the crack tip is not rate controlling but is a necessary condition to accelerated cracking. Positive and negative sawtooth wave form results show that environmental effects are accelerated during loading part of the cycle when deformation is occuring. The results have also been analyzed with respect to the linear superposition model proposed by Wei and Landes.
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