| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Additive Manufacturing Fatigue and Fracture IV: Toward Confident Use in Critical Applications
|
| Presentation Title |
Surface Roughness and Layer Orientation Effects on Fatigue Behavior of LB-PBF Inconel 718 in the High Cycle and Very High Cycle Fatigue Regimes |
| Author(s) |
Palmer Frye, Muztahid Muhammad, Jutima Simsiriwong, Nima Shamsaei |
| On-Site Speaker (Planned) |
Jutima Simsiriwong |
| Abstract Scope |
In this study, the high-cycle fatigue (HCF) and very-high cycle fatigue (VHCF) behavior of Inconel 718, nickel-based super alloys, manufactured via a Laser Beam-Powder Bed Fusion (LB-PBF) process is investigated, with emphasis on the influences of surface roughness and layer orientation. LB-PBF specimens are fabricated in two different build directions (vertical and 45° with respect to the build plate) and two surface finishes (as-built and machined surface conditions). Uniaxial fully-reversed (R = -1) constant amplitude force-controlled fatigue tests are conducted at various stress amplitudes utilizing a servo-hydraulic test system and an ultrasonic test system operating at 10 Hz and 20 kHz, respectively. Fractography analysis is performed using an optical microscope and a scanning electron microscope to identify microstructural features that initiate fatigue cracks in the specimens. Experimental results from LB-PBF Inconel 718 specimens are presented and compared to those of wrought Inconel 718. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |