About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Characterization of Minerals, Metals and Materials
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Presentation Title |
Nano-scale Spatially Resolved Analysis of Hydrogen in Stainless Steels |
Author(s) |
Dallin J. Barton, Mark G. Wirth, Dan Thien Nguyen, Mengkong Tong, Tingkun Liu, Zihua Zhu, Daniel E. Perea, Arun Devaraj |
On-Site Speaker (Planned) |
Dallin J. Barton |
Abstract Scope |
Increased hydrogen concentration in stainless steel causes a noticeable reduction in ductility known as hydrogen embrittlement. The relationship of the bulk mass composition of hydrogen in stainless steel to its mechanical behavior has been thoroughly researched. Spatially resolved characterization techniques with high sensitivity for hydrogen can elucidate hydrogen behavior at the nano-scale. This talk will discuss analysis of hydrogen in model austenitic FeCrNi alloys. A rigorous coupling of electrochemistry, including cyclic voltammetry, and nanoscale characterization, including atom probe tomography and nano secondary ion mass spectrometry, is used to understand hydrogen segregation to material properties such as phase, crystal orientation and structure, and features such as dislocations, twin boundaries, and high-angle grain boundaries. Hydrogen can quickly diffuse out of alloys at room temperatures. Therefore, cryogenic transfer and operation techniques have been developed to decrease unwanted H diffusion before proper characterization. Details concerning cryo-characterization and resulting hydrogen diffusion behavior will be given. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Characterization, Environmental Effects |