| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture: Towards Accurate Prediction
|
| Presentation Title |
Role of Volumetric Defect and Microstructure on the Fatigue Behavior of Additively Manufactured Inconel 718: An Experimental Study |
| Author(s) |
Indrajit Nandi, Nima Shamsaei, Shuai Shao |
| On-Site Speaker (Planned) |
Indrajit Nandi |
| Abstract Scope |
Additively manufactured (AM) Ni-base superalloy Inconel 718 (IN718) exhibits competing defect-mediated and microstructure-mediated fatigue crack initiation. This study aims to reveal the competing roles of defect and microstructure on fatigue crack initiation of AM IN718. Different sets of cylindrical IN718 rods are fabricated with laser powder bed fusion and heat treated. The process parameters and heat treatments are fine-tuned to induce diverse microstructures and defect contents. The variation in the defect content is examined by X-ray computed tomography, and the microstructure is examined using scanning electron microscopy. Rods are machined to specimens and uniaxial tensile, fully-reversed, force-controlled fatigue tests are performed. Fracture surfaces are analyzed to examine the critical defect/microstructural features responsible for crack initiation. Conditions favoring the defect-mediated and microstructure-mediated fatigue crack initiation are revealed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Mechanical Properties, Copper / Nickel / Cobalt |