Influence of processing conditions on strut structure and compressive properties of cellular lattice structures fabricated by selective laser melting
By C. Qiu, S. Yue, N. Adkins, M. Ward, H. Hassanin, Peter D. Lee, P. J. Withers, Moataz M. Attallah. 2015
375 citations recorded by the source corpus.
Abstract AlSi10Mg cellular lattice structures have been fabricated by selective laser melting (SLM) using a range of laser scanning speeds and powers. The as-fabricated strut size, morphology and internal porosity were investigated using optical microscopy (OM), scanning electron microscopy (SEM) and X-ray microtomography (micro-CT) and correlated to the compressive properties of the structure. Strut diameter was found to increase monotonically with laser power while the porosity was largest at intermediate powers. Laser scanning speed was found to thicken the struts only at slow rates while the porosity was largest at intermediate speeds. High speed imaging showed the melt pool to be larger at high laser powers. Further the melt pool shape was found to vary cyclically over time, steadily growing before becoming increasingly instable and irregularly shaped before abruptly falling in size due to splashing of molten materials and the process repeating. Upon compressive loading, lattice deformation was homogeneous prior to the peak stress before falling sharply due to the creation of a (one strut wide) shear band at around 45° to the compression axis. The specific yield strength expressed as the yield stress/(yield stress of the aluminium × relative density) is not independent of processing conditions, suggesting that further improvements in properties can be achieved by process optimisation. Lattice struts failed near nodes by a mixture of ductile and brittle fracture.
Subfields: Automotive Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/9549f3212406bcf1bb63df2678e2cc8c20807d2b
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In Automotive Engineering
- Chinnapat Panwisawas
- J. Brooks
- Hector Basoalto
- Moataz M. Attallah
- C. Qiu
- Xiaobing Feng
- Ifeanyichukwu Echeta
- Samanta Piano
In Mechanical Engineering
- Moataz M. Attallah
- Chinnapat Panwisawas
- J. Brooks
- Hector Basoalto
- C. Qiu
- Hirohisa Kodaira
- Xiaobing Feng
- Ifeanyichukwu Echeta
Citations in the corpus
- A Survey of Modeling of Lattice Structures Fabricated by Additive Manufacturing (2017, methodology): “Qiu et al. [59] used optical microscopy (OM), scanning electron microscopy (SEM) and micro-CT to investigate the as-fabricated strut size, morphology and internal porosity of AlSi10Mg diamond lattice structures fabricated by SLM and correlate them with the compressive properties.”
- Review of defects in lattice structures manufactured by powder bed fusion (2019, methodology): “[87], across the same power range (150 W to 400 W), saw a peak porosity content of 2% at a laser power of 200 W.”
- Change in microstructure of selectively laser melted AlSi10Mg alloy with heat treatments (2017, background): “A porous Al alloy with a cellular lattice structure fabricated by SLM exhibits an unstable compressive stress with a series of peaks and troughs [12,13].”