Optimization Studies for the Gas Atomization and Selective Laser Melting Processes of Al10SiMg alloy
Abstract
Selective laser melting (SLM) is an additive manufacturing technology that can fabricate complex engineering components using a scanning laser beam to melt consecutive layers of powders with characteristics that significantly influence material properties. Present work investigates both the gas atomization and SLM processes for the Al10SiMg alloy with a focus on establishing the relationships among atomization parameters, powder characteristics, SLM parameters and materials properties. Al10SiMg alloy powders (Al-10wt.%Si-0.5wt.%Mg) were batch-produced through gas atomization by systematically varying the melt flow rate (0.012 - 0.037 kg/s), gas pressure (1.4 - 3.1 MPa), and melt temperature (850C -1000C). The highest yield of 80 wt.% was accomplished for powders with particle size smaller than 75um, considered suitable for SLM, utilizing gas pressure of 2.7 MPa, melt flow rate of 0.020 kg/s, and melt temperature of 950C. Investigations for the SLM process were carried out to identify the optimal particle size distribution (PSD) and critical reuse limit for Al10SiMg powders. Five distribution ranges ( < 45µm, 20µm < x < 63µm, < 75µm, < 106µm, 75µm < x < 106µm), and five sets of recycled powder (new, one, five, ten and over twenty uses) were used to build SLM samples for metallographic and mechanical characterization. Archimedes' method, optical, scanning electron microscopy and mechanical testing in tension were employed to assess the influence of powder feedstock on part density, microstructure and mechanical properties, respectively. All PSDs examined in this study produced samples with over 99% relative density, but samples built with size range of 75µm < x < 106µm yielded the highest tensile and yield strengths of 448 MPa and 265 MPa, respectively. Results from recycling demonstrated that Al10SiMg alloy powders can be reused in SLM without sacrificing quasi-static tensile properties.
Notes
If this is your thesis or dissertation, and want to learn how to access it or for more information about readership statistics, contact us at STARS@ucf.edu
Graduation Date
2020
Semester
Summer
Advisor
Sohn, Yongho
Degree
Master of Science in Materials Science and Engineering (M.S.M.S.E.)
College
College of Engineering and Computer Science
Department
Materials Science and Engineering
Degree Program
Materials Science and Engineering
Format
application/pdf
Identifier
CFE0008216; DP0023570
URL
https://purls.library.ucf.edu/go/DP0023570
Language
English
Release Date
August 2020
Length of Campus-only Access
None
Access Status
Masters Thesis (Open Access)
STARS Citation
Park, Sharon, "Optimization Studies for the Gas Atomization and Selective Laser Melting Processes of Al10SiMg alloy" (2020). Electronic Theses and Dissertations, 2020-2023. 267.
https://stars.library.ucf.edu/etd2020/267