| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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| Presentation Title |
Synchrotron In Situ Characterization of Fatigue Crack Initiation Influenced by Intentionally Seeded Porosity in an Additively Manufactured Superalloy |
| Author(s) |
Krzysztof S. Stopka, Jose Solano, Peter Kenesei, Jun-Sang Park, Hemant Sharma, Michael Sangid |
| On-Site Speaker (Planned) |
Krzysztof S. Stopka |
| Abstract Scope |
Additively manufactured (AM) materials are prone to pore defects which limits their widespread adoption in fatigue-limited applications. Qualification of these materials thus requires a strong understanding of the influence of porosity on the driving forces for fatigue crack initiation (FCI). This talk will discuss the characterization of two specimens of Ni-based superalloy 718 using high-energy x-ray diffraction microscopy (HEDM) and micro-computed tomography (μCT) during in situ fatigue testing. One specimen was intentionally seeded with lack of fusion (LOF) porosity whereas the other was built using optimized, nominal process parameters to minimize stochastic porosity. Quantitative trends between FCI, characterized using μCT, and the evolution of the micromechanical state of grains, characterized using HEDM, will be discussed. The results of this study will elucidate our understanding of FCI mechanisms, help inform and validate micromechanical models, and aid in the qualification of AM materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, Mechanical Properties |