Masters Theses

Tan Pan

Keywords and Phrases

Additive Manufacturing; Mechanical Properties; Selective Laser Melting; Stainless Steel 304L

Abstract

“Powder Bed Fusion process with selective laser melting technique is popularly adopted in additive manufacturing area on account of its layer by layer manufacturing fashion capable of fabricating components with complex internal and external geometries and structures. However, the process-property map is unique and vital for different materials and AM configurations used for fabrication. The process parameter is identified as a significant factor that heavily influences the properties and performances of the printed materials.

Current work aimed to extend the existing knowledge on Laser Powder Bed Fusion fabricated AISI 304L by accessing the influence of varying energy input on the mechanical performance. 304L specimens with densities ranging from ~97% to ~99% were produced by varying scan speed and hatch spacing. The result indicated no distinguishing difference was observed of density, hardness, ultimate tensile strength, and uniform elongation once energy density reached more than 47.6 J/mm3. Below this ED, lack of fusion and insufficient overlaps between adjacent scan tracks gave rise to the poor bonding in and between layers, which induced the poor mechanical performance of the printed metal. However, at the highest energy density, impact toughness was also deteriorated by the keyhole porosity induced by the excess remelting and accumulated along the partition line. Anisotropy in tensile and impact performance was clearly observed. By means of varying input energy put the anisotropy in impact performance was modified”--Abstract, page iv.

Advisor(s)

Liou, Frank W.

Committee Member(s)

Chandrashekhara, K.
Chen, Lianyi

Department(s)

Mechanical and Aerospace Engineering

Degree Name

M.S. in Manufacturing Engineering

Comments

This work was funded by Honeywell Federal Manufacturing & Technologies under Contract No. DE-NA0002839 with the U.S. Department of Energy.

Publisher

Missouri University of Science and Technology

Publication Date

Summer 2020

Journal article titles appearing in thesis/dissertation

  • Influence of input energy on mechanical properties of laser powder bed fused AISI 304L stainless steel

Pagination

xi, 44 pages

Note about bibliography

Includes bibliographic references.

Rights

© 2020 Tan Pan, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Thesis Number

T 11754

Electronic OCLC #

1198499041

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Included in

Manufacturing Commons

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