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Meeting 2014 TMS Annual Meeting & Exhibition
Symposium Multiscale Approaches to Hydrogen-assisted Degradation of Metals
Presentation Title Measurement and Modeling of Hydrogen Environment Assisted Cracking in Monel K-500
Author(s) Richard P. Gangloff, Hung Ha, James T. Burns, John R. Scully
On-Site Speaker (Planned) Richard P. Gangloff
Abstract Scope Hydrogen environment assisted cracking (HEAC) of Monel K-500 was quantified for slow-rising stress intensity loading using electrical potential monitoring of small crack propagation and J-integral analysis. Aged Monel K-500 is susceptible to intergranular HEAC in 3.5% NaCl solution when cathodically polarized at/below -800 mV<sub>SCE</sub>; intergranular cracking is eliminated for E<sub>applied</sub> at/above -750 mV<sub>SCE</sub>. Hydrogen solubility versus H overpotential was determined by multiple methods. This database was applied to obtain crack tip H concentration using geometric rescaling of measured crevice potential and pH to calculate crack tip overpotential. This diffusible H concentration rises, from near-0 wppm at E<sub>applied</sub> of -765 mV<sub>SCE</sub>, with increasing cathodic polarization. With these concentrations, excellent agreement is demonstrated between measured and micromechanical model predictions of E<sub>applied</sub>-dependent threshold stress intensity and H-diffusion limited growth rate. A critical level of cathodic polarization must be exceeded for HEAC in Monel K-500, dependent on crack tip strain rate and alloy metallurgy.
Proceedings Inclusion? Planned: Paper Selections

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Ab Initio Based Understanding of the Segregation and Diffusion Mechanisms of Hydrogen in Steels
An Atomistic Study of Helium-3 Bubble Growth in Aging Palladium Tritides
Characterization of Hydrogen Traps in Steels Using Thermal Desorption Spectrometry (TDS)
Connecting Hydrogen-enhanced Plasticity with the Fracture Mechanism
Coupled Atomistic-analytical Approach to Study Hydrogen Embrittlement by Nano-hydride Formation
Designing Steels Combining Ultra-strength and Hydrogen Resistance
Effect of Thermal Up-quenching on Internal Hydrogen Embrittlement of Hot Dip Galvanized High Strength Steel Fasteners
Effects of Hydrogen Concentration, Dislocation Density and Crystal Size in Deformation of Iron Nano-crystals: A Molecular Dynamics Study
Embrittlement Measures in Fe-base Systems Appropriate to Multiscale Models
First-principles Models for Radiation Damage in D-T Fusion Power Plants
Hydrogen- assisted Degradation of Steels Used in Various Market Segments
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Hydrogen-induced Strain Localization at Meso-scale in Austenitic Stainless Steels
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Hydrogen Embrittlement in Precipitation Strengthened Ni-base Superalloys
Hydrogen Embrittlement in Pulse-plated Nickel Material of Liquid Propulsion Rocket Engines
Hydrogen Embrittlement of High Strength Advanced Oilfield Alloys
Hydrogen Embrittlement of Steels: New Observations and Modeling of Micromechanisms of Fracture
Hydrogen Environment Assisted Cracking (HEAC) of Modern Ultra-high Strength Stainless Steel
Hydrogen Permeability in Zn-Ni and Al Coatings
Magnetic Tight Binding Models for Interstitial Elements and Extended Defects in Iron Phases
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On the Implication of Dislocations and Vacancies Distributions on Hydrogen Diffusion and Trapping in FCC Alloys: Grain-boundaries and Dislocation Patterns
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