Effect of a Distributed Heat Source on Melt Pool Geometry and Microstructure in Beam-Based Solid Freeform Fabrication
| dc.creator | Bontha, Srikanth | |
| dc.creator | Klingbeil, Nathan W. | |
| dc.date.accessioned | 2020-03-02T15:33:51Z | |
| dc.date.available | 2020-03-02T15:33:51Z | |
| dc.date.issued | 2006 | |
| dc.description.abstract | The ability to control geometric and mechanical properties of parts fabricated using laser-based manufacturing processes requires an understanding and control of melt pool geometry and microstructure. With the development of electron beam manufacturing or future beam-based deposition processes, the user may have more control over the distribution of incident energy, so that beam width becomes a potential process variable. As such, the focus of this work is the effect of a distributed heat source on melt pool geometry (length and depth) and the thermal conditions controlling microstructure (cooling rates and thermal gradients) in beam-based solid freeform fabrication. Previous work by the authors has employed the Rosenthal solution for a moving point heat source to determine the effects of process variables (laser power and velocity) on solidification cooling rates and thermal gradients controlling microstructure (grain size and morphology) in laser-deposited materials. Through numerical superposition of the Rosenthal solution, the current work extends the approach to include the effects of a distributed heat source for both 2-D thinwall and bulky 3-D geometries. Results suggest that intentional variations in beam width could potentially enable significant changes in melt pool geometry without affecting microstructure. | en_US |
| dc.description.department | Mechanical Engineering | en_US |
| dc.identifier.uri | https://hdl.handle.net/2152/80134 | |
| dc.identifier.uri | http://dx.doi.org/10.26153/tsw/7155 | |
| dc.language.iso | eng | en_US |
| dc.relation.ispartof | 2006 International Solid Freeform Fabrication Symposium | en_US |
| dc.rights.restriction | Open | en_US |
| dc.subject | laser-based material deposition processes | en_US |
| dc.title | Effect of a Distributed Heat Source on Melt Pool Geometry and Microstructure in Beam-Based Solid Freeform Fabrication | en_US |
| dc.type | Conference paper | en_US |