Degree Type

Thesis

Date of Award

2019

Degree Name

Master of Science

Department

Materials Science and Engineering

Major

Materials Science and Engineering

First Advisor

Peter C. Collin

Abstract

The directed energy powder feed additive manufacturing (AM) process fabricates components with good quality, accuracy, and efficiency. However, this is a complex process and without careful consideration can lead to discontinuities in the final product such as porosity, cracks, or unfavorable microstructure. These material discontinuities may occur due to the limited understanding of the relationship between AM source materials and the evolution of the composition and microstructure during the deposition process. This makes it vital to study and correlate the composition, morphology, and characteristics of both the source material and of the final printed parts. In this research the properties of Ti-6Al-4V powders are investigated using methods such as scanning auger microscopy, scanning electron microscopy, various flow measurement methods, differential scanning calorimetry, and electron backscatter diffraction. The properties of LENSTM depositions using these powders are then investigated using tensile testing, scanning electron microscopy, and electron backscatter diffraction.

Copyright Owner

Alden Watts

Language

en

File Format

application/pdf

File Size

69 pages

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