Control of Deviations in Lattice Structures Manufactured by Selective Laser Melting

2019 ◽  
Vol 822 ◽  
pp. 580-584
Author(s):  
Viktoria Vladislavovna Sokolova ◽  
Artem Kantyukov
Keyword(s):  
Relative Density ◽  
Selective Laser Melting ◽  
Control Method ◽  
Computer Models ◽  
Lattice Structures ◽  
Laser Melting

The paper presents the study of lattice structures and deviations in them caused by the phenomena of the selective laser melting. Experimental samples were compared with their computer models and deviations were assessed. The most accurate control method for this material was determined and relative density was calculated from the results of the method.

scholarly journals Investigations on Mechanical Properties of Lattice Structures with Different Values of Relative Density Made from 316L by Selective Laser Melting (SLM)

2020 ◽  
Author(s):  
Paweł Płatek ◽  
Judyta Sienkiewicz ◽  
Jacek Janiszewski ◽  
Fengchun Jiang
Keyword(s):  
Relative Density ◽  
Selective Laser Melting ◽  
Dynamic Testing ◽  
Lattice Structure ◽  
Lattice Structures ◽  
X Ray Diffraction ◽  
Laser Melting ◽  
Geometrical Quality ◽  
Xrd Patterns ◽  
Dynamic Loading Conditions

Nine variants of regular lattice structures with different relative densities have been designed and successfully manufactured. The produced structures have been subjected to geometrical quality control, and the manufacturability of the implemented selective laser melting SLM technique has been assessed. It was found that the dimensions of the produced lattice struts differ from those of the designed struts. These deviations depend on the direction of geometrical evaluation. Additionally, the microstructures and phase compositions of the obtained structures were characterized and compared with those of conventionally produced 316L stainless steel. The microstructure analysis and X-Ray Diffraction XRD patterns revealed a single austenite phase in the SLM samples. Both a certain broadening and a displacement of the austenite peaks were observed due to residual stresses and a crystallographic texture induced by the SLM process. Furthermore, the mechanical behavior of the lattice structure material has been defined. It was demonstrated that under both quasi-static and dynamic testing, lattice structures with high relative densities are stretch-dominated, whereas those with low relative densities are bending-dominated. Moreover, the linear relationship between the energy absorption and relative density under dynamic loading conditions has been defined

scholarly journals Investigations on Mechanical Properties of Lattice Structures with Different Values of Relative Density Made from 316L by Selective Laser Melting (SLM)

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2204 ◽  
Author(s):  
Paweł Płatek ◽  
Judyta Sienkiewicz ◽  
Jacek Janiszewski ◽  
Fengchun Jiang
Keyword(s):  
Relative Density ◽  
Selective Laser Melting ◽  
Dynamic Testing ◽  
Lattice Structure ◽  
Lattice Structures ◽  
X Ray Diffraction ◽  
Laser Melting ◽  
Geometrical Quality ◽  
Xrd Patterns ◽  
Dynamic Loading Conditions

Nine variants of regular lattice structures with different relative densities have been designed and successfully manufactured. The produced structures have been subjected to geometrical quality control, and the manufacturability of the implemented selective laser melting (SLM) technique has been assessed. It was found that the dimensions of the produced lattice struts differ from those of the designed struts. These deviations depend on the strut orientation in relation to the specimen-building direction. Additionally, the microstructures and phase compositions of the obtained structures were characterized and compared with those of conventionally produced 316L stainless steel. The microstructure analysis and X-ray diffraction (XRD) patterns revealed a single austenite phase in the SLM samples. Both a certain broadening and a displacement of the austenite peaks were observed due to residual stresses and a crystallographic texture induced by the SLM process. Furthermore, the mechanical behavior of the lattice structure material has been defined. It was demonstrated that under both quasi-static and dynamic testing, lattice structures with high relative densities are stretch-dominated, whereas those with low relative densities are bending-dominated. Moreover, the linear dependency between the value of energy absorption and relative density under dynamic loading conditions has been established.

scholarly journals Damping behavior of 316L lattice structures produced by Selective Laser Melting

2018 ◽  
Vol 160 ◽  
pp. 1010-1018 ◽  
Author(s):  
Francesco Rosa ◽  
Stefano Manzoni ◽  
Riccardo Casati
Keyword(s):  
Selective Laser Melting ◽  
Lattice Structures ◽  
Laser Melting ◽  
Damping Behavior

scholarly journals Effect of Process Parameters and High-Temperature Preheating on Residual Stress and Relative Density of Ti6Al4V Processed by Selective Laser Melting

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 930 ◽  
Author(s):  
Martin Malý ◽  
Christian Höller ◽  
Mateusz Skalon ◽  
Benjamin Meier ◽  
Daniel Koutný ◽  
...  
Keyword(s):  
Residual Stress ◽  
High Temperature ◽  
Residual Stresses ◽  
Relative Density ◽  
Selective Laser Melting ◽  
Process Parameters ◽  
Stress Reduction ◽  
Laser Melting ◽  
Preheating Temperature ◽  
Laser Velocity

The aim of this study is to observe the effect of process parameters on residual stresses and relative density of Ti6Al4V samples produced by Selective Laser Melting. The investigated parameters were hatch laser power, hatch laser velocity, border laser velocity, high-temperature preheating and time delay. Residual stresses were evaluated by the bridge curvature method and relative density by the optical method. The effect of the observed process parameters was estimated by the design of experiment and surface response methods. It was found that for an effective residual stress reduction, the high preheating temperature was the most significant parameter. High preheating temperature also increased the relative density but caused changes in the chemical composition of Ti6Al4V unmelted powder. Chemical analysis proved that after one build job with high preheating temperature, oxygen and hydrogen content exceeded the ASTM B348 limits for Grade 5 titanium.

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