| About this Abstract |
| Meeting |
2019 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing of Metals: Fatigue and Fracture III
|
| Presentation Title |
The Effects of Microstructure and Material Length Scales on the Fatigue Crack Growth Rates for Thin Wall Additive Manufactured Components |
| Author(s) |
Richard W. Russell, Jacob Hochhalter, David Dawicke, Edward Glaessgen, Douglas Wells |
| On-Site Speaker (Planned) |
Richard W. Russell |
| Abstract Scope |
The use of thin-walled additive-manufactured components in fatigue critical aerospace applications is inevitable. Lack of understanding of the influence of local material length scales and environments could lead to erroneous estimates of fatigue life from improper use of existing models. Several NASA assessments are presented, which were designed to quantify error in fatigue life predictions from use of traditional linear-elastic fracture mechanics models as wall thickness is reduced to under 10 grains. Results of those assessments will serve as a basis for developing design and maintenance guidelines for thin-walled components. Similarities are made with ongoing studies characterizing the effect of microstructure on the fatigue behavior of Inconel 718 produce using Selective Laser Melting (SLM) and of 304L stainless steel produced using Wire and Arc Additive Manufacturing (WAAM). Finally, preliminary results are presented of strength and fatigue of Ti-6Al-4V pressure vessel domes fabricated using electron beam directed energy deposition (EB DED). |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |