|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Environmentally Assisted Cracking: Theory and Practice
||In Situ Experiments to Reveal Coupling Between Stress and Hydrogen on Stress Corrosion Cracking of Fe-based Alloys
||Arun Devaraj, Dallin Barton, Tingkun Liu, Sten Lambeets, Cheng-Han Li, Mark Wirth, Daniel Perea, Matthew Olszta, Jinhui Tao, Tianyi Li, Yang Ren, Shuang Li, Chongmin Wang
|On-Site Speaker (Planned)
When stainless steel is subjected simultaneously to an applied tensile stress and a corrosive, high-temperature aqueous medium, the individual and combined interactions of hydrogen and oxygen with the alloy microstructure are thought to lead to intergranular stress corrosion cracking (SCC), however a nano to atomic scale mechanistic understanding of these interactions are only beginning to emerge. Using novel in situ experiments in transmission electron microscopy, atom probe tomography, atomic force microscopy and synchrotron high-energy x-ray diffraction, we develop a multiscale understanding of this mechanochemical coupling during SCC of Fe-Cr-Ni model alloys. We reveal the structure and composition of oxide layers, the difficult to map hydrogen segregation at the oxide-metal interfaces and grain boundaries, and deformation-induced defects. These experiments ultimately aim to provide a scientific basis for tailoring the microstructure of metallic alloys to enhance the resistance to stress corrosion cracking and hydrogen embrittlement when used in nuclear and automotive applications.
||Environmental Effects, Characterization, Iron and Steel