Abstract

UNS N07718 is widely used in marine service applications under a variety of conditions: alternate immersionAlternate immersion, different levels of cathodic protection, and freely corroding galvanic couples. Environmentally assisted cracking can significantly affect the performance of this alloy and constrains design as it needs to account for subcritical crack growth in service. We measured subcritical crack growth rates and thresholds in different environmental conditions for two different heat treatmentsHeat treatment of UNS N07718. The first heat treatmentHeat treatment, following AMS 5664 is widely used in the aircraft industry and for marine fasteners, and the second, following API 6A, is principally used in the marine and oil and gas industries. The material environmentally assisted cracking was studied under alternate immersionAlternate immersion to natural seawaterNatural seawater and under cathodic protection in natural seawaterNatural seawater. Microstructural modeling is presented to understand and predict how precipitates, their volume fraction, morphology, and properties, affect the evolution and accumulation of dislocation densities within the microstructureMicrostructures, influencing the fracture process at different physical scales.

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