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Meeting MS&T22: Materials Science & Technology
Symposium 2022 Undergraduate Student Poster Contest
Presentation Title Investigation of the Embrittlement Behavior in Alloy 725 with Different H Sources via 3D X-ray Computer Topography
Author(s) Jacob Jackson, Mengying Liu
On-Site Speaker (Planned) Jacob Jackson
Abstract Scope Structural materials can be embrittled when exposed to a hydrogen-rich environment. In an effort to understand the effects of different hydrogen sources to embrittlement behavior, we compare the interior microstructures of hydrogen embrittled (HE) alloy 725 with thermal and electrochemical ingress hydrogen via 3D X-ray computer topography (CT). There are numerous cracks and voids inside of both samples, and understanding the distribution and connection among them is crucial for imparting the HE mechanisms. We develop a MATLAB based script capable of filtrating cracks and voids and recording their volume and centroidal locations. The majority of the HE cracks exist near the surface with electrochemical ingress, while with thermal ingress cracks occur mostly near the center. Detailed correlation regarding the location and size of crack and void and the potential HE mechanism will be discussed. Our research can help with better lifetime prediction of materials for hydrogen transportation and cathodic protection.

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