Publication Date
2019
Document Type
Thesis
Committee Members
Joy Gockel (Advisor), John Middendorf (Committee Member), Nathan W. Klingbeil (Committee Member)
Degree Name
Master of Science in Materials Science and Engineering (MSMSE)
Abstract
Laser powder bed fusion (LPBF) is an additive manufacturing technique used for making complex parts through a layer-by-layer process with fine feature resolution. However, the layer-by-layer process, with complex scanning patterns within each layer, introduces variability in thermal behavior leading to inconsistent microstructure and defects. The in- situ process monitoring approach in this work uses sensors including a high-speed visible camera, thermal camera, and spectrometer to evaluate each location in the LPBF process. Each sensor focuses on a different process phenomenon such as the melt pool or thermal behavior. An experimental study, using metallographic analysis and collection of sensor data, is used to determine the influence of processing parameters and geometric changes on the final microstructure of Alloy 718. The multi-sensor approach creates a comprehensive view of the microstructural changes. Combining in-situ process monitoring with process control allows for the prediction of part quality and reliable material properties.
Page Count
144
Department or Program
Department of Mechanical and Materials Engineering
Year Degree Awarded
2019
Copyright
Copyright 2019, all rights reserved. My ETD will be available under the "Fair Use" terms of copyright law.
ORCID ID
0000-0002-9663-5515
