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Meeting 2014 TMS Annual Meeting & Exhibition
Symposium Multiscale Approaches to Hydrogen-assisted Degradation of Metals
Presentation Title The Role of VC Precipitates in Hydrogen Assisted Cracking of Vanadium Modified 2⅟₄Cr1Mo Steel
Author(s) Kevin Nibur, Sylvain Pillot, Brian Somerday, Richard P. Gangloff
On-Site Speaker (Planned) Kevin Nibur
Abstract Scope The resistance of bainitic 2⅟₄Cr1MoV plate and weld metal to internal hydrogen assisted cracking (IHAC) has been evaluated between 25oC and 150oC using precracked specimens thermally precharged with 7-9wppm hydrogen. Elastic-plastic crack initiation threshold and stable growth resistance were measured using slow rising crack mouth opening displacement and direct current potential drop crack detection. These measures of IHAC are only modestly reduced from those of non-charged specimens; for example, the threshold is above 100 MPa√m for all combinations of variables. A beneficial role of nano-scale VC precipitates is suggested because IHAC fracture thresholds of 2⅟₄Cr1Mo, without vanadium, are consistently in the range of 20-40 MPa√m. Additional experiments utilizing non-charged specimens stressed in pressurized hydrogen gas are compared with the IHAC results to elucidate the role of VC precipitates as beneficial hydrogen trap sites. These data enable a quantitative assessment of the minimum pressurizing temperature of heavy-wall petrochemical reactors to avoid IHAC.
Proceedings Inclusion? Planned: Paper Selections


A Re-examination of the Modeling of Solutes and Their Interactions with Other Defects
A Review on the Influence of Metallurgical Parameters on the Diffusion and Trapping of Hydrogen in Quenched and Tempered Martensitic Steels
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
Hydrogen-defect Interactions in the Framework of the Defactant Concept
Hydrogen-induced Strain Localization at Meso-scale in Austenitic Stainless Steels
Hydrogen Effects on the Material Characteristics of Pulse-plated Nickel
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
Measurement and Modeling of Hydrogen Environment Assisted Cracking in Monel K-500
Modeling Dislocation Mediated Hydrogen Transport
Modeling of Gaseous Impurity Inhibition of Hydrogen Environment Embrittlement
On the Implication of Dislocations and Vacancies Distributions on Hydrogen Diffusion and Trapping in FCC Alloys: Grain-boundaries and Dislocation Patterns
Random-walk Based Continuum Model of Hydrogen Diffusion and Trapping in Metals
Simulating Hydrogen Embrittlement and Fast Pathways for Diffusion through Localization Elements
Hide details for [<a href="/PM/PM.nsf/ApprovedAbstracts/B5E1E4978E53ADE085257B910057F515?OpenDocument">Simulating Oxidation, PhSimulating Oxidation, Phase Transformation and Hydride Precipitation in Zirconium by Phase Field Modeling
[Replication or Save Conflict]
Slip Transmission and Mechanical Behavior of Ni-alloys in the Presence of Hydrogen
The Effect of Alloying on the Properties of Metal-Hydrogen Systems: Modeling and Simulation of Diffusion, Dislocation Loops, and Phase Changes.
The Role of VC Precipitates in Hydrogen Assisted Cracking of Vanadium Modified 2⅟₄Cr1Mo Steel

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