Date of Award
2013-01-01
Degree Name
Master of Science
Department
Metallurgical and Materials Engineering
Advisor(s)
Lawrence E. Murr
Abstract
Unlike more conventional directional solidification, electron and laser-beam melting technologies involve building 3D components through layer-by-layer melt/solidification thermal cycling which creates novel, directional microstructural architectures. In this study we compared various the columnar microstructures of various components manufactured by EBM and SLM; image composite observations of columnar microstructural architectures in Cu, Co-29-Cr-6Mo-0.2C alloy, Ni-22Cr-9Mo-4Nb (alloy 625) fabricated by electron beam melting (EBM), and Ni-19Cr-19Fe-5Nb-1Al (alloy 718) by selective laser melting (SLM) as well as stainless steel 17-4 PH (SLM). Cu produced discontinuous columns of Cu2O precipitates while the Co-base alloy exhibited similar columns of Cr23C6 precipitates. The alloy 625 produced columns of Ni3Nb (ϒ"-bct) precipitates. All of the EBM-produced columnar microstructure arrays were spaced ~2 μm. In contrast, the SLM fabricated alloy 718 contained columnar microstructural arrays of Ni3Nb (ϒ") spaced ~ 0.8μm, the 17-4 PH stainless steel produced martensitic structures dependent on the gas used for manufacturing. The manufactured components were observed by optical microscopy, SEM, XRD and by TEM in order to understand the microstructural development.
Language
en
Provenance
Received from ProQuest
Copyright Date
2013
File Size
105 pages
File Format
application/pdf
Rights Holder
Edwin Martinez
Recommended Citation
Martinez, Edwin, "Exploring New Concepts In Directional Solidification By Electron Beam Melting and Selective Laser Melting" (2013). Open Access Theses & Dissertations. 1876.
https://scholarworks.utep.edu/open_etd/1876