| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Synergistic Effects of Volumetric Defect and Microstructure on Fatigue Crack Initiation in Additively Manufactured Inconel 718: Insights From Crystal Plasticity Simulations |
| Author(s) |
Indrajit Nandi, Sajith Soman, Nima Shamsaei, Shuai Shao |
| On-Site Speaker (Planned) |
Indrajit Nandi |
| Abstract Scope |
Metal additive manufacturing enables the fabrication of complex parts from hard-to-machine Ni-base superalloys like Inconel 718 (IN718). Additively manufactured (AM) IN718 can exhibit both defect-sensitive and defect-insensitive fatigue crack initiation. Volumetric defects cause stress concentrations around them, which can accelerate the formation of persistent slip bands (PSBs) and thus nucleation of cracks in the surrounding grains. This study aims to investigate the competing roles of defect and microstructure on fatigue crack initiation in AM IN718 using crystal plasticity (CP) simulations. CP simulations of cyclic loading have been performed on a defect-free and defect-laden polycrystalline aggregate with varying defect morphologies. The Fatemi-Socie fatigue indicator parameter has been used to numerically track the damage evolution and crack initiation. The findings of the CP simulations, validated by experiments, suggest that although defects can accelerate fatigue crack initiation, they compete with PSBs formed on large slip planes in the absence of defects. |
| Proceedings Inclusion? |
Planned: |