|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||Hydrogen-Induced Fracture: From Fundamentals to Prognosis
||Petros Sofronis, Mohsen Dadfarnia, Akihide Nagao, Shuai Wang, May L. Martin, Brian P. Somerday, Reiner Kirchheim, Robert O. Ritchie, Ian M. Robertson
|On-Site Speaker (Planned)
A summary of recent developments on fracture prognosis for various materials is presented that accounts for microscale deformation mechanisms. Recent studies of structural materials fractured in hydrogen suggest that dislocation structures and hydrogen transported by mobile dislocations play important roles in the evolution of fracture processes/events. A model for hydrogen/deformation interactions that accounts for dislocation transport along with stress driven diffusion and trapping at microstructural defects is introduced. As an example, an approach to quantify the effect of hydrogen on the fracture of a martensitic steel through a statistically-based micromechanical model for the critical local fracture event is also presented. The model accounts for the synergistic effect of hydrogen on decohesion and the effect of dislocations on hydrogen distribution. Lastly, a mitigation strategy for the hydrogen effect on ferritic systems subjected to cyclic loading is suggested: dissolution of a few ppm by volume of oxygen in hydrogen gas.
||Planned: Supplemental Proceedings volume