| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Quantifying Microstructure Heterogeneity for Qualification of Additively Manufactured Materials
|
| Presentation Title |
Intentionally Seeding Pores in Laser Powder Bed Fusion IN718: Microstructure, Defects, and Fatigue |
| Author(s) |
Krzysztof S. Stopka, Andrew Desrosiers, Tyler Nicodemus, Nicholas Krutz, Amber Andreaco, Michael Sangid |
| On-Site Speaker (Planned) |
Krzysztof S. Stopka |
| Abstract Scope |
Progress towards widespread adoption and cross-industry rapid qualification standards for additively manufactured (AM) components requires a strong understanding of the influence of pervasive porosity defects on component fatigue life. In this work, we describe a robust methodology to determine processing parameters to intentionally seed three distinct types of defect structures (e.g., lack of fusion, keyhole/trapped gas, and linearly aligned defects) in AM builds alongside control specimens with minimal porosity through a design of experiments study for Ni-base superalloy IN718. Builds were then characterized using optical microscopy, electron backscatter diffraction, two computed tomography techniques with an order of magnitude difference in resolution, and strain-controlled low cycle fatigue experiments. We find that common metrics such as porosity volume fraction and size of the largest defect do not strongly correlate to fatigue resistance, motivating the need for hybrid experimental- and model-based approaches in the quest for AM qualification standards. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Characterization, |