Article
Materials Science, Multidisciplinary
Andrew Reinhart, Troy Ansell, Walter Smith, Andy Nieto
Summary: Selective laser melting (SLM) processing of metal matrix composites (MMCs) presents unique challenges due to dissimilar interfaces and rapid melting. This study found that uniform deposition of oxides can cause issues with powder flowability and melt pool stability, but also improve the mechanical properties of the composites. Composites fabricated under different oxide reinforcement conditions exhibit varying defects and performance at different scales.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Engineering, Manufacturing
Zhiheng Hu, Xiaojia Nie, Yang Qi, Hu Zhang, Haihong Zhu
Summary: This study developed a model based on modified Rosenthal's equation and Feurer's criterion to predict the critical scanning velocity for crack initiation during SLM of Al-Cu alloys. The model suggests that the molten pool center is most susceptible to crack initiation, and a small hatch spacing is beneficial for manufacturing crack-free components. Factors such as mushy zone length and cooling rate mainly affect cracking in the process.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
F. Bathaee, A. Zarei-Hanzaki, A. Moshiri, H. R. Abedi
Summary: This study investigates the cyclic deformation behavior of AlSi10Mg alloy fabricated through selective laser melting. The directly aged microstructure exhibited the best fatigue performance with an outstanding balance between fatigue life and strength level. The low aspect ratio of the melt pools intensified the Marangoni effect, leading to crack initiation and the formation of balling defects.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Manufacturing
Zhiheng Hu, Yang Qi, Balasubramanian Nagarajan, Xiaojia Nie, Hu Zhang, Haihong Zhu, Xiaoyan Zeng
Summary: Selective laser melting (SLM) is a powder bed based additive manufacturing technology expected to fabricate complex parts. This study systematically investigated the evolution of top surface roughness during SLM of an Al-Cu alloy, revealing that fluid flow intensity and molten pool overlapping affect surface roughness, with increases in layer number contributing to spreading of the molten pool but also harming top surface quality with increased powder thickness.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Nanoscience & Nanotechnology
J. Karimi, C. Suryanarayana, I Okulov, K. G. Prashanth
Summary: This study investigated the effect of remelting on the microstructure and mechanical properties of Ti6Al4V materials fabricated using selective laser melting. The results showed that the number of remeltings significantly influenced the homogenization of the microstructure and mechanical properties of the materials, with an increase in hardness and ultimate tensile strength but a decrease in ductility observed with a higher number of melting steps.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Joseph A. Otte, Jin Zou, Matthew S. Dargusch
Summary: This study demonstrates the successful production of high-performance titanium matrix composites (TMCs) using selective laser melting (SLM) and nanosized BN powder additives. The addition of nanosized BN promotes the formation of TiB nanowhiskers and grain refinement, resulting in TMCs with high tensile yield strength and retained ductility.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
P. Ashwath, M. Anthony Xavior, Andre Batako, P. Jeyapandiarajan, J. Joel
Summary: Additive Manufacturing (AM) and Selective Laser Melting (SLM) are advanced manufacturing methods widely used in the aerospace industry. Current research focuses on using SLM to fabricate Al-Si-10Mg aluminum alloy and study the effects of scanning speed and build orientation on the mechanical strength and surface finish of the components. This research is of importance for dynamic applications.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Sijia Liu, Minsuk Lee, Cheol Choi, Keesam Shin
Summary: In this study, the microstructure, microhardness, and porosity of additive manufactured parts fabricated by selective laser melting are investigated. The porosity of the finished product depends primarily on the energy density used and is more strongly influenced by the scanning speed than the applied laser power. The microstructure exhibits characteristic features attributed to different cooling rates near and far from the laser melting zone.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Ao Wang, Yuqing Yan, Zhenyu Chen, Hongzi Qi, Yuan Yin, Xinhua Wu, Qingbo Jia
Summary: This study systematically investigated the multiple effects of adding Sc/Zr elements to SLM fabricated aluminum alloys, using the newly developed alloy Al-MnSc as an example. The addition of Sc/Zr elements generated an unconventional heterogeneous grain structure in the aluminum alloy, which effectively avoided solidification cracks and alleviated mechanical property anisotropy issues.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Mechanical
Tianyu Yu, Junyan Liu, Yu He, Jinchuan Tian, Mingjun Chen, Yang Wang
Summary: This study investigates the microstructure evolution and wear characteristics of CNTs reinforced aluminum matrix nanocomposites produced by selective laser melting. The results show that these nanocomposites have higher hardness, strength, and good frictional and wear resistance properties compared to pure AlSi10Mg counterparts.
Article
Chemistry, Multidisciplinary
Rubina Ajdary, Niklas Kretzschmar, Hossein Baniasadi, Jon Trifol, Jukka Seppala, Jouni Partanen, Orlando J. Rojas
Summary: In the study, lignin was introduced as a suitable component for selective laser sintering (SLS) of polyamide (PA12) to reduce costs while maintaining or improving processability and performance. The addition of lignin in SLS resulted in composite material with improved thermal stability and mechanical properties, while also influencing the surface properties and wettability of the structures. The research demonstrated the potential of lignin valorization in composites through SLS, allowing for reduced cost, scalability, and easy processing.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Hassanen Jaber, Janos Konya, Tunde Anna Kovacs
Summary: Selective laser melting of Ti64 and 2 wt.% hydroxyapatite composites was conducted to enhance osseointegration and biological fixation between implants and bone tissue. The microstructure of the composite components was found to be complex, with interactions between Ti64 and HA leading to the formation of certain phases that affected the mechanical properties. Despite the poor tensile properties compared to pure Ti64 components, the SLM Ti64-2%HA composite components exhibited significantly higher tensile properties than human bone as reported in previous literature.
Article
Materials Science, Multidisciplinary
Jiapeng Sun, Qisheng Sun, Ying Liu, Bangjun Li, Zheng Zhang, Bingqian Xu, Songsong Xu, Ying Han, Yanxin Qiao, Jing Han, Guosong Wu, Paul K. Chu
Summary: The study investigates the use of ultrasonic severe surface rolling (USSR) to enhance the corrosion resistance of SLM 316L stainless steel, and finds that the USSR processed samples exhibit significant improvement in corrosion resistance, attributed to the unique gradient structure and chemically homogeneous and high-quality surface.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Manufacturing
Navid Alinejadian, Pei Wang, Lauri Kollo, Konda Gokuldoss Prashanth
Summary: This study focuses on fabricating dense and near crack-free commercial pure molybdenum samples using selective laser melting (SLM). The use of a double scan strategy helps reduce the formation of solidification cracks.
3D PRINTING AND ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
B. Rozegari Ghashghay, H. R. Abedi, S. G. Shabestari
Summary: This study investigates the grain refinement in the microstructure of selective laser-melted AlSi10Mg alloy. Randomly oriented grains without preferred micro-texture are observed in the printed microstructure. Columnar grains aligned with the building direction have been formed in the molten pool. Refined equiaxed grains with a size of fewer than 10 mm are formed during solidification or dynamic recrystallization.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)