| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture IV: Toward Confident Use in Critical Applications
|
| Presentation Title |
A-6: Fatigue Life Prediction of Additive Manufactured IN718 Superalloys |
| Author(s) |
Wenye Ye, Pankaj Kumar, Leslie T Mushongera |
| On-Site Speaker (Planned) |
Wenye Ye |
| Abstract Scope |
Fatigue failure of additive manufactured columnar polycrystals is often dominated by crack initiation processes, which are strongly influenced inherent defects existing in the microstructure. Internal microstructural defects such as porosity, inclusions, etc. act as stress concentration sites and preferred crack initiation zones during cyclic loading, leading to premature rupture. We use the crystal plasticity finite element approach to analyze the influence of microstructural heterogeneities on the low cycle fatigue of large-grained polycrystals. A set of microstructurally differing statistically equivalent microstructures is subjected to fatigue and crack nucleation and growth, to analyze transgranular and intergranular crack paths in dependence on microstructural characteristics. The morphology and texture characterized using EBSD and Cellular Automata are utilized to construct representative statistically equivalent microstructures. A criterion related to the energy stored in microstructures under deformation is used to predict scatter in fatigue crack nucleation life and the results compared with experimental findings. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |