|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Seeing is Believing -- Understanding Environmental Degradation and Mechanical Response Using Advanced Characterization Techniques: An SMD Symposium in Honor of Ian M. Robertson
||NOW ON-DEMAND ONLY - Hydrogen Embrittlement: From Experiments and Modeling to Prognosis
||Petros Sofronis, Zahra S. Hosseini, Mohsen Dadfarnia, Masanobu Kubota, Akihide Nagao, Brian P. Somerday, Robert O. Ritchie
|On-Site Speaker (Planned)
Recent experimental studies of the microstructure beneath fracture surfaces of ferritic steel, lath martensitic steel, stainless steel, and nickel specimens fractured in hydrogen suggest that the dislocation structure and hydrogen transported by mobile dislocations play important roles in the evolution of the fracture process/event. After reviewing this plasticity-mediated hydrogen-induced failure, we present a model for hydrogen/deformation interactions to quantify the effect of hydrogen on the fracture resistance of a low alloy martensitic steel through the use of a statistically-based micromechanical model for the critical local fracture event, which relates the influence of hydrogen on dislocation interactions and internal interfaces in affecting decohesion to the onset of macroscopic failure. The results demonstrate that hydrogen induced failures are complex phenomena that can be explained by a combination of HELP and decohesion and require factors such as stress, strain, and hydrogen concentration to all act in concert to bring about failure.
||Environmental Effects, Mechanical Properties, Magnesium