Selective Laser Melting of aluminium alloy using a uniform beam profile

Loh, L.E.; Liu, Z.H.; Zhang, D.Q.; Mapar, Mahta; Sing, Swee Leong; Chua, Chee Kai; Yeong, Wai Yee

doi:10.1080/17452759.2013.869608

Cited by 64 publications

(29 citation statements)

References 13 publications

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“…The SLM process begins with splitting a component into layers, and fuses the powder selectively by a laser power to make this fully melted powder combined with former layer. Finally it can get a fully dense part [15][16][17][18]. This method makes it possible to fabricate very complex lattice structures [19].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Mechanical Properties’ Anisotropy of Rod Units in Lattice Structures Fabricated by Selective Laser Melting

Jing

Yong

et al. 2017

MATEC Web Conf.

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Abstract. Lattice structure with high strength and low mass using selective laser melting (SLM) has been a hot topic. However, there are some problems in the fabrication of lattice structure by SLM. Rod unit is the basic component of lattice structure and its performance affects the whole structure. It is necessary to investigate the influence of selective laser melting on rod unit's mechanical properties. A series of rod units with different inclination angle and diameter were fabricated by SLM in this research. And the mechanical properties of these units were measured by tensile test. The results show that the rod units with different diameters and inclination angles have good mechanical properties and show no difference. It is a good news for lattice structure designing for there is no necessary to consider the mechanical properties' anisotropy of rod units.

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Section: Introductionmentioning

confidence: 99%

Investigation on Mechanical Properties’ Anisotropy of Rod Units in Lattice Structures Fabricated by Selective Laser Melting

Jing

Yong

et al. 2017

MATEC Web Conf.

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“…Despite the 80 μm laser spot size, the melt pool formed will have larger depth and width than the spot size [56,129,178,189,190], which is the designed strut dimensions value. A schematic of the forming mechanisms of these struts in the yz/xzplane are again shown in Figure 43.…”

Section: Statistical Modelling Of Resultsmentioning

confidence: 99%

“…The SLM machine is equipped with a Gaussian beam fibre laser with maximum power of 400 W and a focal diameter of 80 μm. All processing occurred in an argon environment with less than 0.05 % oxygen to prevent oxidation and degradation of the material during the process [160]. Sectorial, also known as island or chessboard, scanning as shown in Figure 17 was used.…”

Section: -Parameters Optimization For Selective Laser Meltingmentioning

confidence: 99%

“…This results in formation of laminar substructures in the solidified TiTa. The formation of these laminar substructure with directionality is due to the Gaussian laser heat source which non uniform power distribution and fluctuating energy output [178]. This results in multiple temperature gradients of different direction within the melt pool.…”

Section: Figure 28 Grain Size Distribution Of Slm Produced Tita Samplesmentioning

confidence: 99%

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Selective laser melting of novel titanium-tantalum alloy as orthopaedic biomaterial

Sing¹

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Selective laser melting (SLM) is an additive manufacturing (AM) technique that is capable of fabricating complex functional three-dimensional (3D) metal parts of high relative density with the complete melting and fusion of powders. As a powder bed fusion technology, SLM has the potential in expanding the materials library by formation of alloys that were previously difficult to achieve from metal powder mixtures that can be customised according to the application requirements. Titanium-tantalum (TiTa) is a potential material for biomedical applications due to its high strength to modulus ratio. However, it is still not widely used due to the difficulties in obtaining this alloy. SLM is chosen as the method to form this alloy due to its versatility in processing metallic materials and good results obtained from commercially pure titanium (cpTi) and Ti6Al4V. This research aims to develop TiTa as a potential material for biomedical applications. The study also paves the way for better understanding and control of the SLM process in porous lattice structure fabrication through statistical modelling. Firstly, the TiTa formation is studied to understand the forming mechanism and the effect of SLM processing parameters on the resulting density and macrostructure of the parts. The processing window and optimised parameters based on optimum relative density achieved are then presented. Secondly, the resulting microstructure of TiTa parts was examined and characterised to facilitate the understanding of the SLM forming process. The SLM TiTa parts exhibited a microstructure characterised by homogenous β titanium and tantalum matrix with randomly distributed tantalum particles. Thirdly, the mechanical properties of SLM TiTa parts is benchmarked against the more commonly used cpTi and Ti6Al4V. The TiTa Young's modulus is Abstract ii 75.77 ± 4.04 GPa and has yield strength of 882.77 ± 19.60 MPa, ultimate tensile strength of 924.64 ± 9.06 MPa and elongation of 11.72 ± 1.13 %. It is found that SLM TiTa parts have lower Young's modulus and comparable strength to Ti6Al4V and cpTi. Fourthly, the effect of SLM processing parameters on lattice structure properties is statistically modelled and analysed using regression analysis and analysis of variance (ANOVA). It is shown that laser power and layer thickness are dominant factors in affecting the properties of the lattice structures. Lastly, the properties of SLM TiTa lattice structures are also benchmarked against lattice structures fabricated using cpTi and Ti6Al4V. With 59.79 ± 0.68 % porosity, TiTa exhibits an elastic constant of 4.57 ± 0.09 GPa and yield strength of 151.93 ± 4.04 MPa which provides a higher strength to elastic constant ratio when compared to Ti6Al4V and cpTi. The same conclusions are drawn for compressive and tensile properties. Cell culture study using osteoblastlike SAOS-2 cells found that SLM TiTa has similar biological response to cpTi and Ti6Al4V. These favourable findings ascertained the feasibility of SLM TiTa as a biomaterial and contributed to the scie...

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“…Much research and development has been made in SLM, mainly regarding the optimization of parameters for manufacturing parts using di erent types of metals and alloys (Gu et al, 2012;Kruth et al, 2004;Read et al, 2015;Rombouts et al, 2006;Song et al, 2014;Sun et al, 2013). Some of the main input parameters include the laser power, laser type, scanning velocity, laser beam spot size, hatching styles, powder layer thickness, scan- Figure 2.3: A typical SLM layout (Kruth et al, 2005) ning strategies, preheating temperature of the base plate etc (Leuven, 2007;Loh et al, 2014). Environmental e ects such as inert gas and preheating and have also been studied (Zhang et al, 2013a).…”

Section: Sls/slmmentioning

confidence: 99%

Large scale selective laser melting : study of the effects and removal of spatter by the inert gas flow

Anwar¹

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Selective Laser Melting of aluminium alloy using a uniform beam profile

Cited by 64 publications

References 13 publications

Investigation on Mechanical Properties’ Anisotropy of Rod Units in Lattice Structures Fabricated by Selective Laser Melting

Investigation on Mechanical Properties’ Anisotropy of Rod Units in Lattice Structures Fabricated by Selective Laser Melting

Selective laser melting of novel titanium-tantalum alloy as orthopaedic biomaterial

Large scale selective laser melting : study of the effects and removal of spatter by the inert gas flow

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