About this Abstract |
Meeting |
2021 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2021)
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Symposium
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Materials
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Presentation Title |
Directed Energy Deposition Additive Manufacturing of Nickel Aluminum Bronze: Temperature Dependent Properties for Predicting Distortion |
Author(s) |
Glenn Hatala, Qian Wang, Edward William Reutzel, Charles R. Fisher, Jennifer K Semple |
On-Site Speaker (Planned) |
Glenn Hatala |
Abstract Scope |
There is increased interest in using nickel aluminum bronze (NAB) alloys in large-scale directed energy deposition additive manufacturing (DEDAM) processes, but excessive distortion is of concern during fabrication. High-fidelity simulations can improve distortion prediction and enable use of distortion mitigation techniques, however open literature and public databases lack the required temperature-dependent NAB properties necessary for accurate predictions. The first contribution of this paper lies in acquiring temperature-dependent properties of alloy C95800 test specimens obtained from multiple wire-fed additive processes. The second contribution involves thermal-mechanical simulation and analysis of a DEDAM NAB build. Finite-element simulations using temperature-dependent material properties are compared to those using temperature-independent material properties, i.e. constant at room temperature. Significantly greater distortion is predicted in simulations using temperature-dependent properties. These results show that use of temperature-independent properties in distortion prediction could lead to inaccurate DEDAM NAB parts that require significant post-processing or are completely unusable. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |