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Meeting Materials Science & Technology 2020
Symposium Environmentally Assisted Cracking: Theory and Practice
Presentation Title The Relationship between Post-build Stress-relief Heat Treatment and the Hydrogen Embrittlement Susceptibility of Additively Manufactured IN625
Author(s) Mark R. Stoudt, Richard Ricker, Maureen Williams, Fan Zhang
On-Site Speaker (Planned) Mark R. Stoudt
Abstract Scope The combination of strength, corrosion resistance, and excellent weldability makes IN625 an attractive alloy for additive manufacturing (AM) applications, but the build process generates large compositional and residual stress gradients. Appropriate post-build heat treatments are necessary to relieve stress and produce uniform microstructures and properties; however, stress-relief also promotes the growth of carbides and intermetallic phases. Large precipitates alter the local electrochemical conditions, while the modulus mismatch with the surrounding matrix can reduce the crack propagation resistance. The question is whether these secondary phases increase the susceptibility of IN625 to hydrogen embrittlement. Slow strain rate tensile tests were performed in an acidified chloride solution using wrought and AM samples, with and without heat treatment, and under free corrosion and potentiostatic conditions that controlled the hydrogen fugacity. The experimental protocol, and the results from microstructural and fractographic analyses of the AM materials will be compared to the wrought IN625 and discussed.
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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