Characterization of 316L Steel Cellular Dodecahedron Structures Produced by Selective Laser Melting

Abstract

Abstract:The compression behavior of different 316L steel cellular dodecahedron structures with different density values were studied. The 316L steel structures produced using the selective laser melting process has four different geometries: single unit cells with and without the addition of base plates beneath and on top, and sandwich structures with multiple unit cells with different unit cell sizes. The relation between the relative compressive strength and the relative density was compared using different Gibson-Ashby models and with other published reports. The different aspects of the deformation and the mechanical properties were evaluated and the deformation at distinct loading levels was recorded. Finite element method (FEM) simulations were carried out with the defined structures and the mechanical testing results were compared. The calculated theory, simulation estimation, and the observed experimental results are in good agreement.

Additive Manufacturing: Reproducibility of Metallic Parts

“…Detailed information about the fabrication of the CP-Ti can be found at [22]. Gas atomized 316L powders were used to fabricate SLM parts with the following parameters: laser power-100 W; laser scan speed-800 mm/s; layer thickness-30 µm; and hatch distance-120 µm, with 90 • hatch rotation between the layers [23,24]. Similar gas atomized bronze powders (with the following parameters: laser power-271 W; laser scan speed-210 mm/s; laser thickness-90 µm; and hatch distance-90 µm) were used for producing the bulk SLM bronze parts [25].…”

Applications, Manufacturing and Thermal Characteristics of Micro-Lattice Structures: Current State of the Art

“…Metal powder is melted and fused together by utilizing the laser power. Melting and fusing operation is done with the help of CAD data input [14][15][16]. To fabricate a part without any imperfections or defects, several process parameters have to be adjusted which have been explored in literature.…”

“…Comparatively Faster process as that of conventional process, prototypes are strong enough to undergo machining; costly process, careful handling of photopolymer is required 10 µm Selective laser melting [14][15][16][17][18][19]21] Metal or polymer powder is spread in layers and is selectively melted as per input from CAD file with the help of a laser beam and resolidified; strut build angle has strong influence on properties of structure To optimize the process, limited number of parameters are to be considered; capable of processing large number of metal powders 40 -200 µm Electron beam melting [21] Similar operation to that of SLM but the laser beam is replaced by an electron beam, capable of processing brittle materials.…”

Mechanical Properties and Corrosion Behaviour of 316l Stainless Steel Honeycomb Cellular Cores Manufactured by Selective Laser Melting

“…Alsalla et al [35] studied the effect of different building directions on the properties of density, tensility and fracture toughness of 316L stainless steel cellular lattice structures manufactured by the SLM technology. Prashanth et al [36] investigated the compression behaviour of different specimen geometries from the open-cell rhombi-dodecahedron structure with three different density values and fabricated from the 316L gas-atomized powder using the selective laser melting. Another recent study was performed by Feng et al [37] including the theoretical method and the finite element analysis for predicting mechanical properties of BCC structures and uniaxialreinforced BCCZ and f2BCC structures manufactured by using the SLM technology.…”