Abstract
Recently, additive manufacturing (AM) processes are transforming from rapid prototyping technology to mass industrial production due to increase in the fidelity of the AM machines. This trend triggers the process optimization for various applications. In prior literature, high-fidelity numerical models have been presented to understand the rapid solidification conditions occurring during the process which includes heat transfer, fluid flow and beam interaction with the raw material. However, most of these models are simulating few melt passes and it is computationally expensive to simulate an entire layer of the component being fabricated. In this study, we use a low-fidelity model to simulate an entire layer. We also introduce a new melt strategy to control the solidification microstructure (i.e. columnar to equiaxed transition). The response of the solidification morphology to process parameters (ex. point offset, power, spot time) are investigated in terms of thermal gradient G and solidification rate R. The model is validated with the experimental microstructure data.
| Original language | English |
|---|---|
| Pages | 1005-1017 |
| Number of pages | 13 |
| State | Published - 2020 |
| Event | 28th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2017 - Austin, United States Duration: Aug 7 2017 → Aug 9 2017 |
Conference
| Conference | 28th Annual International Solid Freeform Fabrication Symposium - An Additive Manufacturing Conference, SFF 2017 |
|---|---|
| Country/Territory | United States |
| City | Austin |
| Period | 08/7/17 → 08/9/17 |
Funding
The research was sponsored by the US Department of Energy, Office of Energy Efficiency and Renewable Energy, Advanced Manufacturing Office under contract DE-AC05-00OR22725 with UT-Battelle, LLC. Notice of Copyright. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).
| Funders | Funder number |
|---|---|
| U.S. Department of Energy | |
| Advanced Manufacturing Office | DE-AC05-00OR22725 |
| Office of Energy Efficiency and Renewable Energy |
