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 |
Effects of HIP on the Quasi-static and High Cycle Fatigue Behavior of Thin-Walled Inconel 718 by Laser Bed Powder Fusion |
Author(s) |
Paul Paradise, Chad Beamer, Dhruv Bhate |
On-Site Speaker (Planned) |
Dhruv Bhate |
Abstract Scope |
Mechanical properties of as-printed specimens fabricated with the Laser Powder Bed Fusion (LPBF) process have been shown to experience reductions as their thickness reduces, particularly below 1mm. In this work, we report on results obtained from quasi-static and High Cycle Fatigue (HCF) tests conducted on LPBF Inconel 718 specimens manufactured with a thickness range of 0.3 – 2 mm, and heat treated with and without a Hot Isostatic Pressing (HIP) step, in order to identify what effects HIP has on the thickness dependence. We report that for quasi-static properties, HIP almost eliminates thickness dependency observed for yield strength, while preserving the dependency for elongation and UTS. For HCF, HIP preserves thickness dependence, but only outperforms non-HIP specimens at high stresses. Through a combination of microstructural and Finite Element Analysis studies, as well as leveraging comparisons to a sheet metal baseline, we explore the underlying reasons for these HIP-induced effects. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |