Quantification and characterization of the damaging process provide important information leading to a better understanding of the degradation mechanisms involved in oxidation assisted intergranular cracking of this alloy. Mechanisms resulting in such degradation are not well-understood, but it is well established that a relation exists between a change in fracture mode and the apparition of plastic instabilities phenomenon in a wide range of temperatures. Nevertheless, it is a well known fact that this alloy is sensitive to oxidation assisted intergranular cracking under loading in the range of temperature met in service. Alloy 718 is the superalloy the most widely used in industry due to its excellent mechanical properties as well as oxidation and corrosion resistance in wide range of temperatures and solicitation modes.
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