|About this Abstract
||2014 TMS Annual Meeting & Exhibition
||Multiscale Approaches to Hydrogen-assisted Degradation of Metals
||Connecting Hydrogen-enhanced Plasticity with the Fracture Mechanism
||Megan Emigh, Ian Robertson, Petros Sofronis, Kelly Nygren, Akihide Nagao, May Martin
|On-Site Speaker (Planned)
The presence of hydrogen in a metal has been shown to enhance the mobility of dislocations in all pure metals and alloys that show susceptibility to hydrogen embrittlement. Previously, the connection between hydrogen-enhanced plasticity and fracture was made through continuum modeling, however, advances in experimental capabilities to explore the microstructure immediately beneath fracture surfaces is providing new insight. The resulting microstructures are surprising in that they have evolved further than anticipated. The results suggest two effects of internal hydrogen: the first being that hydrogen accelerates the microstructure evolution and, the second being that it stabilizes unanticipated microstructure configurations. This has several consequences, including work hardening of the matrix and modification of the distribution of hydrogen. It is proposed that it is these effects in combination that determine the fracture mode and pathway. Experimental observations in different materials and under different loading conditions will be presented to support this claim.
||Planned: Paper Selections