|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
||Crack-tip Shielding by Dislocations Analyzed by HVEM and Its Effect on Fracture Toughness and Hydrogen Embrittlement
||Kenji Higashida, Masaki Tanaka
|On-Site Speaker (Planned)
Crack-tip dislocations and their shielding effect on fracture toughness is one of the most essential issues in the study of toughening mechanism of crystalline materials. In this work, detailed characterization of crack-tip dislocations was carried out by using high voltage electron microscopy (HVEM), and their shielding effect on fracture toughness was investigated by using photoelasticity and stress analyses for crack-dislocation interactions.
In addition to this study, hydrogen effect on fracture toughness is discussed from the view point of dislocation shielding. It is well known that hydrogen embrittlement (HE) is quite different from low temperature embrittlement, since HE occurs in spite that hydrogen does not necessarily suppress plastic deformation or conversely enhances localized plasticity. In this presentation, a possibility of hydrogen effect on the dislocation shielding is discussed as the mechanism behind HE phenomena.
||Mechanical Properties, Environmental Effects, Characterization