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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Environmentally Assisted Cracking: Theory and Practice
Presentation Title Metallurgical Factors and Changes Driving Susceptibly to Environment Assisted Cracking in Aluminum Alloys
Author(s) Allison Akman, Rebecca Bay, Leslie G. Bland, David Schrock , Jennifer S. Locke
On-Site Speaker (Planned) Jennifer S. Locke
Abstract Scope Aluminum-magnesium alloys, designated as AA5xxx by the Aluminum Association, are used readily in naval applications because of their low density, moderate strength, formability, weldability, and superior corrosion resistance. In order to impact sufficient strength, Mg additions are typically higher than the solubility limit of ~3.5%. At room temperature a Mg supersaturated solid solution is kinetically stable in these high Mg Al alloys; but it has been well established that exposure to elevated temperatures, even those typically experienced in-service, for extended periods of time leads to precipitation of a Mg rich β phase on grain boundaries. The literature establishes that the precipitation of β phase on grain boundaries leads to a severe degradation in corrosion and stress corrosion cracking resistance. In fact, intergranular corrosion issues have been reported on more than 200 commercial vessels containing AA5083-H321. Because marine structures are exposed to corrosive seawater environments while simultaneously experiencing cyclic (fatigue) stresses from 1) ship machinery vibrations, 2) diurnal thermal variations leading to thermal expansion and contraction, 3) wind and wave action (hog/sag motion), and 4) combat/operational loading events; understanding the impact of β phase on corrosion fatigue (CF), the simultaneous interaction of corrosion and fatigue, resistance is of interest. A combination of high resolution fracture mechanics based studies and corrosion experimentation is utilized to understand and quantify the effect of the formation of β phase along grain boundaries on CF of two high Mg AA5xxx alloys. Specifically, results will be discussed showing that the resistance to CF is severely degraded under low frequency loading, and the deleterious effect of grain boundary β phase is magnified as fatigue loading frequency decreases. Crack growth rates for microstructures heavily decorated with β phase are accelerated by ~3 orders of magnitude compared to the as-received microstructure when loading frequencies typical of wave motion are investigated. Additionally, comparison of stress corrosion cracking (SCC) resistance via K1SCC, the threshold below which SCC does not occur, with CF results shows that severe degradation in CF resistance is triggered by loading conditions which promote SCC. Should time allow results on precipitation hardened Al alloys aimed at examining the ability to use Bayesian Network modeling to predict corrosion to corrosion fatigue crack transition will also be discussed.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

3D Microstructural and Electrochemical Characterization of Accelerated Corrosion in Aluminum Alloys
Characterization of Stress Corrosion Cracking of 304 Stainless Steel Using High-energy Synchrotron X-ray Microtomography
Comparative Assessment of the Fracture Behaviour of API 5L X65 and Micro-alloyed Steels in E80 Simulated Fuel Ethanol Environment
Comparison of Hydrogen Introduction Techniques for In-situ TEM Straining Experiments
Correlative 3D Imaging of Iodine-induced Stress Corrosion Cracks in Zr Alloys
Corrosion Crack Propagation Modeling Using Meshless Peridynamics Approach
Cracking Behavior and Fracture Toughness of Irradiated Austenitic Stainless Steels in LWR Environments
Dealloying Induced Stress Corrosion Cracking
Dispelling Myths about Gaseous Hydrogen Environmental Fracture and Fatigue
EAC Behavior of Modified Duplex Stainless Steel Bars in Seawater
Effect of 3D Crystallographic Orientation and Microstructure on the Evolution of Corrosion in Aluminum Alloys
Effect of Frequency on Corrosion Fatigue Behavior of Steel 1.4016 in E85 Biofuel up to the Very High Cycle Fatigue Regime
Effect of Hydrogen on Ideal Shear Strength of Metals: An Ab-initio Study
Effect of Mechanical Deformation on the Corrosion Behavior in Al 7075 – Ti6Al4V Galvanic Joint
Effect of Titanium Contents on Hydrogen Induced Cracking Susceptibility and Hydrogen Permeation Characteristic of X80 Pipeline Steel
Electrochemical-mechanical Interactions in an Aluminum Alloy under Slow Strain Rate Stress Corrosion Cracking
Environment Induced Degradation in Maraging Steel Grade 18Ni1750
Environmental Cracking: Theory Depends on Practice
Evaluating the Effect of Sensitizing Time on the Hydrogen Embrittlement of Austenitic Stainless Steels
From First Discoveries in the Late 1800s to Mechanistic Understanding and Radiation Effects in the Early 2000s: Over 140 Years of Stress Corrosion Cracking Research
Fundamental Mechanisms of Preventing Stress Corrosion Cracking of Austenitic Alloys by Laser Shock Peening
Hydrogen-dislocation Interaction Revisited by Quantitative Mechanical Tests inside TEM
Hydrogen and Dislocation Assisted Grain Boundary Crack Initiation Mechanism
IASCC Behavior of Additively Manufactured 316L Stainless Steel in Light Water Reactor Environments
Incorporating Detailed Experimental Grain Boundary β-phase (Mg2Al3) Observations to Improve Sensitization Modeling of Aluminum AA5XXX Alloys
Influence of MC Carbides and γ’ on Hydrogen Trapping in Nickel Alloys and Superalloys: Experiment and Alloy Design
Mechanisms of High Temperature Stress Corrosion Crack Initiation in Austenitic Alloys
Metallurgical Factors and Changes Driving Susceptibly to Environment Assisted Cracking in Aluminum Alloys
Phase Field Modeling of Pitting & Crevice Corrosion
Role of Nitrogen on Hydride Nucleation and Stability in Pure Niobium by First-principles Calculations
SCC Property Evolution of X70 Pipeline Steel in Simulated Deep-sea Environments
Sensitization Effects on Tensile Behavior in 5XXX Series Aluminum Alloys: Environmentally Enhanced Cracking
The Effects of Grain Boundary Structure on the Intergranular Stress Corrosion Cracking Initiation Susceptibility of Alloy 690 in High Temperature Water
The Stress Corrosion Cracking Mechanism of a Cu-free Al-Zn-Mg Alloy in Sodium Chloride Solutions
Trapping against Hydrogen Embrittlement

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