Additive Manufacturing of Ti-64 Using Selective Laser Melting

Nimmo, Caylin

Additive Manufacturing of Ti-64 Using Selective Laser Melting

dc.contributor.advisor	Billings, Christopher
dc.contributor.author	Nimmo, Caylin
dc.contributor.committeeMember	Liu, Yingtao
dc.contributor.committeeMember	Siddique, Zahed
dc.date.accessioned	2024-08-01T22:02:03Z
dc.date.available	2024-08-01T22:02:03Z
dc.date.issued	2024-08-01
dc.date.manuscript	2024-04-10
dc.description.abstract	Selective Laser Melting (SLM) is an Additive Manufacturing (AM) process that is seeing adoption in many engineering industries, namely in biomedical, automotive, and aerospace applications. In this work, the capabilities of the General Electric (GE) Additive Concept M2 Series 5 Titanium Ti-64 Grade 23 SLM printer are characterized in a preliminary study to guide future research and processes at the Sooner Additive Manufacturing Laboratory (SAML). Ti-64 (90% titanium, 6% aluminum, 4% vanadium by weight) AM has become more accessible in the last decade and is of particular interest to the United States Air Force for fabricating replacement parts for aging aircraft. This work focuses on reviewing the Powder Bed Fusion (PBF) process and determining the bulk tensile properties of horizontally printed specimens using GE’s provided parameters while expanding the capabilities of the SAML to prepare it for additional testing. As printed samples were compared to all 3 of the Stress Relief (SR) options provided by GE alongside a study to evaluate the potential for shot peening using resources readily available in the laboratory. Samples were evaluated using Digital Image Correlation (DIC) during the loading processes and a universal testing system. Samples were shown to present properties similar to that of the provided GE specifications, but fell short of the published values for as printed and SR3 samples for the Balanced Parameter 114. In-house polishing processes were expanded to successfully present Ti-64 grain structures under optical microscopy and Scanning Electron Microscopy (SEM) by decreasing the final polishing particle size to 0.02 μm and including additional particle sizes during preparation (9 μm, 6 μm, 3 μm, 1 μm, 0.05 μm, 0.02 μm). Future work should and will include a larger sample size for each specimen type and utilize ASTM E8M specimens.	en_US
dc.identifier.uri	https://hdl.handle.net/11244/340553
dc.language	en	en_US
dc.subject	Additive Manufacturing	en_US
dc.subject	Material Science	en_US
dc.subject	Titanium 64	en_US
dc.thesis.degree	Master of Science	en_US
dc.title	Additive Manufacturing of Ti-64 Using Selective Laser Melting	en_US
ou.group	Gallogly College of Engineering::School of Aerospace and Mechanical Engineering	en_US