About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Additive Manufacturing Fatigue and Fracture: Effects of Surface Roughness, Residual Stress, and Environment
|
Presentation Title |
Evaluating Residual Stress Effects on Fatigue Crack Growth Behaviour of AM Stainless Steel Processed via DED and PBF |
Author(s) |
Christine Smudde, Christopher San Marchi, Michael Hill, Jeffery Gibeling |
On-Site Speaker (Planned) |
Christine Smudde |
Abstract Scope |
Additive manufacturing technologies, such as directed energy deposition (DED) and powder bed fusion (PBF), offer unique advantages for innovative engineering design. However, they also introduce challenges in fatigue critical applications due to process induced residual stress in as-built material. In this study, fatigue crack growth behaviour of type 304L stainless steel produced by DED and PBF methods was evaluated and compared. Fatigue crack growth rates were explored over a range of applied alternating stress intensity factors in the near threshold regime and were quantitatively corrected for the influence of residual stress using residual stress intensity factors determined using online compliance. Specimens oriented for crack growth parallel and perpendicular to the build direction provided insight into the anisotropy of residual stress and resulting fatigue behaviour. Finally, assessments of variations in crack growth rates due to crack tip interactions with microstructure were made using images of grain morphology surrounding crack path profiles. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Mechanical Properties, Other |