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Meeting MS&T22: Materials Science & Technology
Symposium Resisting Degradation from the Environment: A Symposium Honoring Carolyn M. Hansson’s Research and Pioneering Experiences as a Woman in STEM
Presentation Title Investigation of Crack Initiation in Hydrogen Embrittled Ni-base Alloy 725
Author(s) Mengying Liu, Lai Jiang, Michael J Demkowicz
On-Site Speaker (Planned) Mengying Liu
Abstract Scope The factors responsible for hydrogen embrittlement (HE) of metals remain imperfectly understood, with prevailing theories emphasizing H-induced decohesion or H-enhanced localized plasticity (HELP). We use in situ tensile testing to clarify the role of slip in the initiation of intergranular cracks in alloy 725. We quantitatively assess the HELP hypothesis using melt extraction to measure H content and digital image correlation (DIC) to analyze localized plastic strains during in situ tensile tests in a scanning electron microscope (SEM). We find localized slip is neither necessary nor sufficient for crack initiation. The role of slip is likely to reduce local cohesive strength and create local stress concentrations that promote decohesion. Understanding the mechanism can help with improving future alloy design and lifetime prediction.


Characterization of Internal Oxidation in Alloy 690 and Model Ni Alloys
Correlating Crack Tip pH to Environment Assisted Cracking Performance in Al Alloys
Corrosion and Biocompatibility of 316L Stainless Steels Fabricated by Selective Laser Melting
Corrosion and Environmentally Assisted Cracking (EAC) Evaluation of Additively Manufactured (AM) High Strength Precipitation Hardened Steel (UNS S17400)
Corrosion of Fe-Cr-Mn Stainless Steel in Supercritical Water
Evaluating the Sensitivities of SCC Susceptibility in Stainless-steel Nuclear Waste Storage Containers
Galvanic Corrosion of Active and Passive Steel Bars with Different Area Ratios
Investigation of Crack Initiation in Hydrogen Embrittled Ni-base Alloy 725
Liquid Metal Embrittlement: Cracking Open the Disparate Mechanisms
Oxidation Behavior of Model FeCrAl Steel and APMT Alloy After Exposure in Steam
Quantifying the Environmentally Assisted Cracking Initiation and Short Crack Behavior in New Generation 7xxx Aluminium
Relating Microstructure to Environmental Degradation in Al-Mg Alloys
The Effect of Microstructural Surface States on the Corrosion of Additively Manufactured 316 Stainless Steel

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