Abstract
The microstructure and mechanical properties of laser powder bed fused (LPBF) AlSi10Mg alloys can be controlled by many processing parameters. This study focuses on the scan rotation angle, α, between adjacent layers, and establishes the relationship between α and tensile behavior of the as-built LPBF-processed AlSi10Mg alloy. Near-full density cubic coupons were manufactured using the same processing parameters but with systematic variation of α from 0° to 90°. Microscopic observations and X-ray diffraction analysis showed that differences among various coupons mainly include orientations of the melt pools with respect to the build direction and development of the crystallographic texture. The α=0° coupon and α=30° coupon showed the highest and lowest texture index, although the overall crystallographic texture was mild. Tensile specimens were manufactured horizontally and vertically using either α=0° or α=30°, but with various first layer laser direction with respect to the build plate. Notably, the α=0° specimen that was tested along the laser scan direction showed the largest yield strength (283 MPa) and highest tensile ductility (10.1 %). Quantitative image analysis and fractography were performed on all specimens. Results showed that the melt pool orientation with respect to the tensile direction affected the tensile behavior across the different specimens. This was closely related to the localized strain distribution within the melt pool and along the melt pool boundary for the different melt pool orientations observed. These results demonstrate that the laser scan rotation angle between layers can be used to fine tune the mechanical properties of LPBF AlSi10Mg alloy.
| Original language | English |
|---|---|
| Article number | 102340 |
| Journal | Materialia |
| Volume | 39 |
| DOIs | |
| State | Published - Mar 2025 |
Funding
This work is supported by the startup fund from Opus College of Engineering at Marquette University. The Keyence optical microscope used in this study was purchased through a grant support from GHR Foundation. The authors would like to thank financial support from the National Science Foundation under Grant No. CMMI-2138588. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). The authors would like to thank Dr. Yongho Sohn from University of Central Florida for providing samples for testing and characterization. The authors would also like to thank Dr. Hao Pan and Dr. Yuanli Bai from University of Central Florida for performing the tensile tests. This work is supported by the startup fund from Opus College of Engineering at Marquette University. The Keyence optical microscope used in this study was purchased through a grant support from GHR Foundation. The authors would like to thank financial support from the National Science Foundation under Grant No. CMMI-2138588 . Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation. The authors would like to thank Dr. Yongho Sohn from University of Central Florida for providing samples for testing and characterization. The authors would also like to thank Dr. Hao Pan and Dr. Yuanli Bai from University of Central Florida for performing the tensile tests.
Keywords
- AlSi10Mg
- Laser powder bed fusion (LPBF)
- Melt pool
- Scan rotation
- Tensile property