About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Presentation Title |
Visualization of Melt Pool Stability for Wire- and Powder-based Directed Energy Deposition Repair of Gray Cast Iron |
Author(s) |
Jakob D. Hamilton, Iris V. Rivero |
On-Site Speaker (Planned) |
Jakob D. Hamilton |
Abstract Scope |
Gray cast iron is favorable in agricultural and automotive castings for its high strength and wear resistance but offers difficulty during remanufacturing. Key challenges include restoring strength while avoiding brittle phases and porosity. While wire-based directed energy deposition (DED) repair studies are limited, powder-based DED has shown promise under specific thermal conditions. Determining these conditions is challenging due to the localized and transient nature of the process. Herein, in-situ high speed imaging is employed for quantifying melt pool stability for optimal thermal conditions in wire- and powder-based DED repair of gray cast iron. The rate of gas generation and escapement from the melt pool is driven by laser power and traverse speed. Stable deposition conditions, i.e. minimal melt pool geometric deviation, are identified for both media types, and the resultant strength is quantified. The insights provided by in-situ imaging promote superior parameter selection and is extendable to other difficult-to-repair materials. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |