| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Large-scale Metallic Components
|
| Presentation Title |
Dehydrogenation Model for Hydrogen-based Heat Treatments of Large Additively Manufactured Components |
| Author(s) |
James D. Paramore, Michael T. Hurst, Matthew K. Dunstan, Daniel O. Lewis, Brady G. Butler |
| On-Site Speaker (Planned) |
James D. Paramore |
| Abstract Scope |
Thermo-Hydrogen Refinement of Microstructure (THRM) is a simple heat treatment, which has been shown to be an effective post-process for additively manufactured titanium alloys. During THRM, a component is charged with hydrogen to allow unique phase transformations and microstructural engineering, and then dehydrogenated to prevent hydrogen embrittlement. Predicting necessary dehydrogenation times is particularly problematic for large components, as the large amount of hydrogen evolved is constantly changing the partial pressure inside the furnace. Therefore, a Fickian diffusion model of the process has boundary conditions that are dependent on the instantaneous flux of hydrogen from the surface (i.e., dependent on the instantaneous concentration profile within the component). Modeling techniques for dealing with this challenge for components with > 5 cm cross-sections will be discussed. While this effort was focused on additively manufactured titanium components, the model and methods to experimentally identify model inputs are applicable to many diffusion-limited, gas-solid reactions. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Titanium, Modeling and Simulation |