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Meeting Materials Science & Technology 2020
Symposium Environmentally Assisted Cracking: Theory and Practice
Presentation Title Corrosion Fatigue Testing of AA7085-T7451 in Complex Atmospheric Environments of Varied Humidity with Surface Salt Loading
Author(s) Brandon T. Free, Austin Burns, Jason Niebuhr, Sarah Galyon Dorman, Jenifer Locke
On-Site Speaker (Planned) Brandon T. Free
Abstract Scope AA7085-T7451 is used in aerospace environments with fluctuating relative humidity (RH), variable temperatures (T), ozone, UV light, and surface salt. Traditional corrosion fatigue (CF) experiments utilizing lab air, water vapor, or full immersion may not adequately model in-service environments. The aim of this study is to measure CF crack growth rates (da/dN) in environments of varied RH and T where surface salts are present. Testing is completed by monitoring crack length during intervals of fixed loading and environmental parameters. Experiments that changed loading frequency for each interval show samples loaded with 300 μg/cm2 of NaCl and exposed to 80% RH exhibit similar da/dN to samples immersed in 0.06 M NaCl. Experiments that varied RH show da/dN does not immediately rise with increasing RH or fall when RH is decreased below the efflorescent point. Effects of wet/dry cycling and da/dN changes due to changing crack tip electrolyte content are under investigation.
Proceedings Inclusion? Undecided

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Analyzing High-angle Grain Boundary Network Connectivity Using Graph Theory
Assessing the Influence of Hydrogen on The Deformation Behavior of a Precipitation-hardened Nickel-based Alloy
Atomistic Simulations of the Transport and Trapping of Hydrogen in Zirconium
Corrosion Fatigue Testing of AA7085-T7451 in Complex Atmospheric Environments of Varied Humidity with Surface Salt Loading
Cracking Mechanism of Carbon Steel in Presence of H2S/CO2 and H2S Scavenger, a Theory Based on Electrochemistry, Raman, and Tensile Testing
Directional Sensitization Responses in 5XXX Series Aluminum Alloy Microstructures
Elucidating the Loading Rate Dependence of Hydrogen Environment-assisted Cracking Behavior in Ti, Fe, Al, and Ni-based Structural Alloys
Hydrostatic Instability as the Underlying Mechanism of Hydrogen Embrittlement
Introductory Comments: Environmentally Assisted Cracking: Theory and Practice
Microstructure and Beta Phase Distribution Effects on Environmental Fracture Susceptibility in Al-Mg Alloys
Pit-to-Crack Transition in Stress Corrosion Cracking of Type 304 Stainless Steels Under Marine Exposure Conditions
The Relationship between Post-build Stress-relief Heat Treatment and the Hydrogen Embrittlement Susceptibility of Additively Manufactured IN625
The Role of SCC in Corrosion Fatigue Kinetics of AA5456-H116
Understanding Pitting Corrosion in a High-performance Aluminum Alloy by 4D X-ray Microtomography

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