Theses and Dissertations

Date of Award

12-2022

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Manufacturing Engineering

First Advisor

Dr. Anil Srivastava

Second Advisor

Dr. Jianzhi Li

Third Advisor

Dr. Farid Ahmed

Abstract

This study investigated the surface properties of additive manufactured Inconel 718 produced through selective laser melting, and the effects of laser ablation and CNC grinding on the surface finish. The objectives were to investigate the effects of the various parameters of laser ablation and CNC grinding on the Inconel 718 surface. The parameters used for the laser experiments were pulse energy (4, 20, and 30 µJ), scanning speed (5, 10, and 15 mm/s), and hatch distance (10, 30, and 50 µm). For the grinding experiments, the wheel speed was kept constant at 20.3 m/sec, however, two different workpiece speed (8.6 and 14.7 m/min) and depths of cut (0.013 and 0.025 mm) were used. The average surface roughness of the samples were measured before and after the experiments, and the microstructure was also observed using scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). It was observed that laser ablation reduced the surface roughness, but there were cracks on the surface as a result of oxidation that occurred during the process. On the other hand, the precision CNC grinding of the samples produced relatively better surface finish and also all the surface defects were eliminated.

Comments

Copyright 2022 Sampson K. Canacoo. All Rights Reserved.

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