Dissertation/Thesis Abstract

Microstructural Analysis of Ti-6Al-4V Components Made by Electron Beam Additive Manufacturing
by Coleman, Rashadd L., Ph.D., The University of Alabama, 2017, 95; 10603400
Abstract (Summary)

Electron Beam Additive Manufacturing (EBAM) is a relatively new additive manufacturing (AM) technology that uses a high-energy electron beam to melt and fuse powders to build full-density parts in a layer by layer fashion. EBAM can fabricate metallic components, particularly, of complex shapes, in an efficient and cost-effective manner compared to conventional manufacturing means. EBAM is an enabling technology for rapid manufacturing (RM) of metallic components, and thus, can efficiently integrate the design and manufacturing of aerospace components. However, EBAM for aerospace-related applications remain limited because the effect of the EBAM process on part characteristics is not fully understood. In this study, various techniques including microhardness, optical microscopy (OM), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), and electron backscatter diffraction (EBSD) were used to characterize Ti-6Al-4V components processed using EBAM. The results were compared to Ti-6Al-4V components processed using conventional techniques. In this study it is shown that EBAM built Ti-64 components have increased hardness, elastic modulus, and yield strength compared to wrought Ti-6Al-4V. Further, it is also shown in this study that the horizontal build EBAM Ti-6Al-4V has increased hardness, elastic modulus, and yield strength compared to vertical build EBAM due to a preferential growth of the β phase.

Indexing (document details)
Advisor: Acoff, Viola L.
Commitee: Allison, Paul G., Jordon, Brian, Monroe, Charles, Weaver, Mark L.
School: The University of Alabama
Department: Metallurgical and Materials Engineering
School Location: United States -- Alabama
Source: DAI-B 79/02(E), Dissertation Abstracts International
Subjects: Mechanical engineering, Materials science
Keywords: Additive manufacturing, Ebam
Publication Number: 10603400
ISBN: 978-0-355-35288-7
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