Masters Theses

Keywords and Phrases

Laser additive manufacturing

Abstract

"This study examines the use and functionality of laser depositing alloys from mixes of elemental metallic powders. Through the use of laser-based additive manufacturing (LAM), near net-shaped 3-Dimensional metallic parts can be produced in a layer-by-layer fashion. It is customary for pre-alloyed powders to be used in this process. However, mixes of elemental powders can be used to produce alloys that are formed during the deposition process. This alternative technique requires that the elemental powders adequately mix during deposition for a homogeneous deposit to be produced. Cost savings and versatility are among several of the advantages to using elemental powder mixes in LAM. Representative alloys of 316 and 430 Stainless Steel (SS) and Ti-6Al-4V were produced with elemental powder mixes during this research. These deposits were then compared to deposits of the same material manufactured with pre-alloyed powder. Comparison between the two types of samples included; EDS analysis to examine chemical homogeneity, metallography techniques to compare microstructures, and finally hardness testing to observe mechanical properties. The enthalpy of mixing is also discussed as this can impact the resulting homogeneity of deposits produced with mixes of elemental powders. Some differences were observed between the two types of deposits for 430 SS and Ti-6Al-4V. Results indicate that deposits fabricated with mixes of elemental powders can be produced to an equivalent quality of pre-alloyed powder deposits for 316 SS. This research also proposes potential alloys that could be considered for use in an elemental powder mixing technique"--Abstract, page iii.

Advisor(s)

Newkirk, Joseph William

Committee Member(s)

Liou, Frank W.
Miller, F. Scott, 1956-

Department(s)

Materials Science and Engineering

Degree Name

M.S. in Materials Science and Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2013

Pagination

x, 105 pages

Note about bibliography

Includes bibliographical references (pages 65-67).

Rights

© 2013 Rodney Michael Clayton, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Powder metallurgyManufacturing processesPulsed laser depositionAlloys -- Analysis

Thesis Number

T 10386

Electronic OCLC #

870651561

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