About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
|
Symposium
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Poster Session
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Presentation Title |
Directed Energy Deposition of
Stellite 21 Hardfacing Coatings |
Author(s) |
Ziyad M. Smoqi, Joshua Toddy, Scott Halliday, Jeffrey E Shield, Prahalad K. Rao |
On-Site Speaker (Planned) |
Ziyad M. Smoqi |
Abstract Scope |
The goal of this work is the crack-free deposition of a multi-layer Cobalt-Chromium alloy coating (Stellite 21) on Inconel 718 substrate using the directed energy deposition (DED) additive manufacturing process. Stellite alloys are used as coating materials given their resistance to wear, corrosion, and high temperature. Deposition of Stellite with DED is desirable because the microstructure evolved is typically finer compared to weld overlay processes, such as plasma transfer arc, which in turn improves the hardness of the coating. The main challenge in DED of Stellite coatings is the proclivity for crack formation during printing. The objective of this work is to characterize the effect of the laser power (input energy) and localized laser-based preheating on the physical properties of the coating, namely, crack formation, microstructural evolution, dilution of the coating composition due to diffusion of iron and nickel from the substrate, and microhardness. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |