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Marine fastener alloys can be susceptible to hydrogen environmentally assisted cracking (HEAC) in cathodically polarized seawater environments [1]- [3]. Understanding the controlling mechanisms of HEAC is critical to developing accurate predictive models for structural management of these material systems. Prior work has demonstrated that there is a potentially strong influence of loading rate on the HEAC susceptibility in environments pertinent to engineering applications [4]. The current work uses linear elastic fracture mechanics (LEFM) based testing to characterize the stress intensity rate (dK/dt) dependence of HEAC behavior for Monel K-500 (Ni-based superalloy) and MP98t (Co-based superalloy) in cathodically polarized solutions. This work has been divided into three tasks to rigorously analyze the material behavior.

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