Mechanical Engineering ETDs

Publication Date

Spring 4-17-2023

Abstract

Additive manufacturing is a method of manufacturing based on building parts layer by layer, allowing for more control over shape of the product, therefore reducing machining costs, reducing material waste, faster production times and the ability to build complex engineering design that other manufacturing technologies won’t be able to produce. This research is on the tensile and indentation testing (following ASME standards) of 3D printed Ti-6Al-4V and Inconel 718 built by powder-based direct energy deposition technology. Ti-6Al-4V is an attractive material for the aerospace and aviation industry, and Inconel 718, a nickel-chromium based superalloy, is an attractive material for usage in extreme environments and high-temperature applications. The purpose of this research is to conduct indentation testing using Rockwell and Vickers testers, conduct tensile testing using an Instron machine and a micro-tensile tester to examine the mechanical characteristics of the alloys, and study the microstructure of the alloys as-built and post heat treatment. The focus of this research is on the difference in mechanical properties and microstructure of each material at the horizontal sections and vertical sections. Not much research has been done on the effect of location of the material tested when it comes to additive manufacturing, specifically for Inconel 718 material due to its difficult machinability. Both vertical and horizontal sections were cut and investigated for their tensile properties and microstructure, post and pre-heat treatment process. The data were also compared with their respective commercial wrought counterparts for control purposes.

Keywords

additive DED titanium Ti-6AL-4V inconel laser LENS tensile hardness build

Degree Name

Mechanical Engineering

Level of Degree

Masters

Department Name

Mechanical Engineering

First Committee Member (Chair)

Tariq Khraishi

Second Committee Member

Pankaj Kumar

Third Committee Member

Yu-Lin Shen

Document Type

Thesis

Language

English

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