About this Abstract |
Meeting |
MS&T21: Materials Science & Technology
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Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
Defect Free Pure Molybdenum Processed through Electron Beam Melting |
Author(s) |
Patxi Fernandez-Zelai, Chris Ledford, Elizabeth Ellis, Quinn Campbell, Andres Marquez Rossy, Michael Kirka, Donovan Leonard |
On-Site Speaker (Planned) |
Patxi Fernandez-Zelai |
Abstract Scope |
Electron beam melting (EBM) additive manufacturing (AM) is an attractive technology for printing refractory materials as preheating can mitigate against many cracking mechanisms. The majority of existing molybdenum research is focused on laser based processing with relatively little EBM work. In this presentation we share recent work on EBM processing of molybdenum. We observed anomalous microstructures consisting of sharp {001}, {111}, and mixed {001} & {111} crystallographic fibers in the build direction. The preference for these build direction fibers is dependent on the imposed surface energy density and which is likely due to changes in the weld pool morphology. Detailed microscopy demonstrates that columnar grains consist of much finer equiaxed subgrains suggesting large process induced stresses which drive plastic deformation. This work demonstrates that molybdenum may be processed crack-free through EBM AM. Furthermore, the resulting build direction fiber may be controlled, and exploited, towards fabricating components with optimized engineering properties. |