Document Type
Article
Publication Date
8-2020
Publisher
Springer
Source Publication
Metallography, Microstructure, and Analysis
Source ISSN
2192-9262
Abstract
We examine the microstructural characteristics of LPBF AlSi10Mg produced by using a wide range of LPBF processing parameters with independently varied laser power, hatch spacing, scan speed, slice thickness, and the normalized energy density. The lower energy density produced lack of fusion flaws from residual interparticle spacing, while the higher energy density produced spherical pores from trapped gas. The highest density (> 99%) samples were produced by using an energy density of 32 to 54 J/mm3. Within this energy density range, use of smaller slice thicknesses increased the processing window that would produce dense AlSi10Mg samples. A cellular structure, consisting of Al–Si eutectic and α-Al (fcc) matrix, within melt pools was quantified in size to determine the cooling rate of 105 to 107 K/s. This sub-grain cellular structure was found to decrease in size with increasing scan speed and increasing slice thickness.
Recommended Citation
Hyer, Holden; Zhou, Le; Park, Sharon; Gottsfritz, Guilherme; Benson, George; Tolentino, Bjorn; McWilliams, Brandon; Cho, Kyu; and Sohn, Yongho, "Understanding the Laser Powder Bed Fusion of AlSi10Mg Alloy" (2020). Mechanical Engineering Faculty Research and Publications. 317.
https://epublications.marquette.edu/mechengin_fac/317
Comments
Accepted version. Metallography, Microstructure, and Analysis, Vol. 9 (August 2020): 484-502. DOI. © 2020 Springer. Used with permission.
Le Zhou was affiliated with University of Central Florida at the time of publication.