About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
|
Presentation Title |
Influence of Build Orientation on High Temperature Fatigue Crack Growth Mechanisms in Inconel 718 Fabricated by Laser Powder Bed Fusion: Effects of Temperature and Hold Time |
Author(s) |
Diego Martinez de Luca, Philippa Reed, Andrew Hamilton |
On-Site Speaker (Planned) |
Andrew Hamilton |
Abstract Scope |
Superalloy Inconel 718 manufactured by Laser Powder Bed Fusion (L-PBF) has been characterized in terms of the microstructure, effect of post-processing heat treatment, and hence dependence of fatigue crack growth on build orientation, even after subsequent heat treatment. Long crack fatigue tests were conducted on SENB samples at 350 and 650 ⁰C in air at a load ratio 0.1, under 1-X-1-1 trapezoidal loading waveforms with dwell times, X, of 1s, and 90s at maximum load. At 350 ⁰C no apparent difference in crack growth rates was found, with transgranular fracture modes found at all K levels. Intergranular fracture modes become evident when testing at higher temperatures, with the vertical samples showing greater crack growth resistance at both frequencies. Horizontal specimens have on average a higher degree of intergranular failure. Their smaller grain size, and lower area fraction of twins resulting in a higher number of grains susceptible to embrittlement. |
Proceedings Inclusion? |
Planned: |
Keywords |
Additive Manufacturing, Other, Other |