About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Presentation Title |
Microstructure and mechanical properties of additively manufactured Inconel 718: A comparative study between L-PBF and LP-DED |
Author(s) |
Nabeel Ahmad, Shaharyar Baig, Reza Ghiaasiaan, Paul R. Gradl, Shuai Shao, Nima Shamsaei |
On-Site Speaker (Planned) |
Shaharyar Baig |
Abstract Scope |
This study aims to characterize the microstructure and mechanical properties of Inconel 718 fabricated using two different additive manufacturing processes: laser powder bed fusion (L-PBF) and laser powder directed energy deposition (LP-DED). Similar heat treatments (HTs) including stress-relief (1065ºC for 1.5 hr), hot isostatic pressing (1162 ºC under 100 MPa isostatic pressure of Ar gas for 3 hr), solution annealing (1065 ºC for 1 hr), and two-step ageing (760 ºC for 10 hr + 650 ºC for 10 hr) are applied to both batches. Scanning electron microscopy is utilized to characterize microstructural evolution during each step of HTs for both samples. Tensile tests are performed to evaluate the mechanical properties at room temperature. Elongation to failure of L-PBF specimens is measured to be 16% lower than that of the LP-DED ones, while the ultimate tensile and yield strengths of L-PBF specimens are, respectively, 9% and 6% higher, compared to the LP-DED ones. The differences in tensile properties between two specimens are explained using microstructural and fracture surfaces analysis. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |