About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture
|
| Presentation Title |
Role of Volumetric Defects and Microstructure on the Fatigue Behavior of Additively Manufactured Inconel 718: An Experimental Study |
| Author(s) |
Shuai Shao, Nima Shamsaei, Reza Molaei |
| On-Site Speaker (Planned) |
Shuai Shao |
| Abstract Scope |
The fatigue of Inconel 718 is not always sensitive to volumetric defects and can exhibit both microstructure-mediated and defect-mediated crack initiation. Limited literature suggests that the competition between the two mechanisms may be governed by the microstructural length scale relative to that of defects. Nevertheless, systematic experimental work validating this governance has been lacking, which is perhaps due to the non-trivial nature of simultaneously controlling microstructure and defects within specimens. This work addresses such challenges by fabricating Inconel 718 rods using laser powder bed fusion with plasma and N2 gas atomized feedstocks in Ar and N2 atmospheres, respectively, and subject the resulting parts to two heat treatments to induce four distinct microstructures. Process parameters were intentionally deviated from the recommended ones to induce defects of different sizes and shapes. Interestingly, results revealed a similar dependence of fatigue life on the crack initiating feature size, regardless of the crack initiation mechanism. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Copper / Nickel / Cobalt, Characterization |