| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
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Quantifying Microstructure Heterogeneity for Qualification of Additively Manufactured Materials
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| Presentation Title |
The Impact of Volumetric Energy Density on Mechanical Properties of Additively Manufactured 718 Ni Alloy |
| Author(s) |
Benjamin T. Stegman, Anyu Shang, Luke Hoppenrath, Anant Raj, Hany Abdel-Khalik, John Sutherland, David Schick, Victor Morgan, Kirti Jackson, Xinghang Zhang |
| On-Site Speaker (Planned) |
Benjamin T. Stegman |
| Abstract Scope |
Parameter normalization is essential in understanding how parameters affect the microstructure and resulting mechanical properties in laser powder bed fusion (LPBF). Volumetric energy density (VED), a leading measurement tool, estimates the amount of energy inputted per volume and compares the mechanical properties. In this work, alloy 718 tensile bars were printed in a design of experiments (DOE) testing VEDs from 30-93 J/mm3. ~46 J/mm3 was identified as the threshold value between the lack of fusion regime and the conduction regime. Tensile properties, such as yield strength and ultimate tensile strength, decreased with higher VEDs (up to ~200 MPa difference) , while other properties, such as uniform elongation, final elongation and work hardening exponent, increased with higher VEDs (up to ~0.1 and ~26% MPa difference). In-depth microstructural analysis, utilizing residual stress measurement techniques, chemical segregation analysis, electron backscatter diffraction (EBSD) analysis and fracture surface investigation, explains these trends. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Additive Manufacturing, Copper / Nickel / Cobalt, Mechanical Properties |