| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
| Presentation Title |
Fatigue Crack Propagation in Plasticity Mismatched Bi-material Steels Fabricated by Laser Powder Bed Fusion |
| Author(s) |
Anqi Liang, Sandeep Sahu, Xiao Zhao, Tomas Polcar, Andrew Hamilton |
| On-Site Speaker (Planned) |
Andrew Hamilton |
| Abstract Scope |
Joining multiple materials within a single laser powder bed fusion (LPBF) build process is an emerging capability offering the possibility of compositional and geometrical complexity and helping to eliminate the need for additional processing to join different materials. Suitable combinations of materials may offer a strategy to enhance fatigue performance by resisting crack initiation and/or propagation. This study focuses on the combination of 316L SS and 15-5PH SS, and the propagation of fatigue cracks through bi-material interfaces. Mismatches in plasticity between them are expected to cause shielding and anti-shielding and thus changes in crack growth rates. The long-crack fatigue results indicate that anti-shielding effects from plasticity mismatches in these materials are relatively small in terms of damage tolerant lifetimes and, according to the fracture surface morphology, residual stress distributions along the building direction appear to play a more important role in this respect. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Mechanical Properties, Joining |