Tracking hydrogen: A multi-scale experimental-computational study of hydrogen influence on dislocations, plasticity, damage
Abstract
Hydrogen embrittlement (HE) is one of the most important challenges in the use of high strength structural alloys. Its influence is seen in various different industries, ranging from oil and gas industry to construction industry, and to defense industry. High strength alloys used in naval applications are specifically susceptible to HE, due the typical, extreme conditions (e.g. low temperatures, corrosive environments, cyclic stresses). Thus, for such components, ensuring failure resistance is of key importance for the safety of structures and military personnel. To this end, the materials science community have been putting enormous resources to reveal how hydrogen atoms interact with lattice defects, to cause HE. Understanding the hydrogen-lattice defect interactions at the nano-scale and revealing their influence on the localized micro plasticity can help designing materials that can efficiently avoid HE. In this project, a novel experimentalcomputational approach is proposed that integrates in situ SEM hydrogen desorption experiments, in situ SEM mechanical testing experiments, and molecular dynamics, ab initio and finite element simulations. This integrated approach provides a unique opportunity to investigate H interactions with different microstructural features, in order to develop a mechanistic and microstructural understanding of HE. This improved understanding will pave the way towards designing highperformance and failure resistant alloys for naval applications.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jul 10, 2018
- Source ID
- N000141812284
Entities
People
- Cemal Tasan
Organizations
- Massachusetts Institute of Technology
- Office of Naval Research
- United States Navy