| About this Abstract |
| Meeting |
2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
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| Symposium
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2023 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2023)
|
| Presentation Title |
Uniaxial Fatigue Behavior and Life Prediction of Additively Manufactured Inconel 718 with Different Grain Morphology |
| Author(s) |
Muztahid Muhammad, Sajith Soman, Nabeel Ahmad, Douglas N. Wells, Shuai Shao, Nima Shamsaei |
| On-Site Speaker (Planned) |
Nabeel Ahmad |
| Abstract Scope |
Understanding the fatigue behavior and failure mechanisms is essential for qualifying and standardizing additively manufactured metallic components. This study investigates the uniaxial fatigue behavior and failure mechanisms of laser powder bed fused (L-PBF) Inconel 718 (IN718) specimens with different grain sizes obtained by altering the process parameters and heat treatment. Uniaxial, fully-reversed, and strain-controlled fatigue tests were conducted on specimens with machined and polished surface conditions. Microstructural analysis and fractography using a scanning electron microscope were performed to measure the sizes of grains and facets. Fatigue cracks were initiated at the persistent slip bands near or at the surfaces rather than process-induced volumetric defects in all cases. The fatigue behavior of L-PBF IN718 specimens was correlated with the sizes of grains and facets. Fatigue life estimation incorporating the NASGRO equation and √area of the grain sizes was performed and shown to predict fatigue life within scatter bands of five. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |