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Meeting Materials Science & Technology 2020
Symposium Environmentally Assisted Cracking: Theory and Practice
Presentation Title The Role of SCC in Corrosion Fatigue Kinetics of AA5456-H116
Author(s) David J. Schrock, Jenifer S. (Warner) Locke
On-Site Speaker (Planned) David J. Schrock
Abstract Scope The role stress corrosion cracking (SCC) plays in accelerating corrosion fatigue (CF) kinetics (da/dN) of 5xxx series aluminum is investigated. 5xxx series alloys with as-fabricated microstructures are corrosion resistant. However, at temperatures 40 °C and higher, 5xxx series alloys containing greater than ~3 wt.% Mg precipitate anodic β-phase on α-aluminum grain boundaries. This phenomenon, called sensitization, increases environment assisted cracking susceptibility. Experiments on AA5456-H116 were conducted in 3.5 wt.% NaCl at different maximum stress intensities (K<sub>max</sub>), but same stress intensity range, to probe the effect of SCC on da/dN. Results establish that heavily sensitized microstructures exhibit da/dN with inverse <i>f</i>-dependence. The severity of this inverse <i>f</i>-dependence increases when K<sub>max</sub> values are within stage II for SCC. Conversely, increasing K<sub>max</sub> for lightly sensitized microstructures, which are SCC resistant, does not cause an inverse <i>f</i>-dependence. Findings support a hypothesis that strong inverse <i>f</i> dependent da/dN is driven by superposition of SCC.
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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