Comparison of different post processing technologies for SLM generated 316l steel parts

Löber, Lukas; Flache, Christoph; Petters, Romy; Kühn, U.; Eckert, J.

doi:10.1108/13552541311312166

Cited by 116 publications

(64 citation statements)

References 16 publications

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“…Only at the beginning of the densification process can a small difference be observed between the 2 × 2 × 4 and the 4 × 4 × 8 structures. This could very well be due to the differences in the amount of semi-molten particles that are stuck on the surfaces of the struts, which could influence the densification behavior [23]. The specimen geometries are quite similar to the ones produced by Murr et al [21], as well as from Cheng et al [22]; the results from their publication are displayed along with the present results ( Figure 10).…”

Section: Resultssupporting

confidence: 73%

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

et al. 2016

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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.

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Section: Resultssupporting

confidence: 73%

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

et al. 2016

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“…These filigree support structures are built up from the same material and in the same SLM process as the desired part and have to be removed mechanically afterwards as proposed by Hussein et al (2013b). The complete SLM process is a number of iterations of the same procedure which consists in applying powder, melting the selected areas of the powder bed with the laser and lowering the building platform to enable the next application of a new powder layer as described by Löber et al (2013). A schematic of the process is shown in figure 1.…”

Section: Introductionmentioning

confidence: 99%

Selective laser melting of a beta-solidifying TNM-B1 titanium aluminide alloy

Löber

Schimansky

Kühn

et al. 2014

Journal of Materials Processing Technology

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141

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The interest for a wider range of useable materials for the technology of selective laser melting is growing. In this work we describe a new way to optimize the process parameters for selective laser melting of a beta solidifying titanium aluminide. This kind of material has so far not been processed successfully by this method. The new approach is easy to conduct and well transferable to other materials. It is based on the fact that the parts generated from selective laser melting can be described by an addition of multiple single tracks. Multiple types of single track experiments are performed and in combination with knowledge from laser welding tests optimized parameter combinations are derived. Compact samples are built with the optimized process parameters and characterized in terms of microstructure, phase composition and mechanical properties. With this technique the generation of a TNM-B1 titanium aluminide alloy sample with a density greater than 99% could be achieved. The mechanical properties are comparable with material produced by conventional techniques.

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“…Chemical polishing and electrochemical polishing can effectively treat all kinds of freeform surfaces, lattices and porous structural parts [10,11], but do not solve the environment, health and safety problems. In addition, the electric field is limited inside deep cavities in electrochemical polishing, and therefore the internal finishing may be not uniform [11,12]. Abrasive flow machining is an effective process of polishing metal-based AM parts with complex internal cavity and channel structures [7].…”

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Material Removal in Ultrasonic Abrasive Polishing of Additive Manufactured Components

2019

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Featured Application: The study of the material removal mechanisms in ultrasonic abrasive polishing provides technical support for the surface modification of metal-based additive manufactured components which have poor surface quality. In addition, the technology can be further applied to smoothing various complex shapes and the internal features of both metal and non-metal parts, due to the use of loose abrasive particles and the possibility of uniform material removal process.Abstract: Powder-based layered Additive Manufacturing (AM) techniques lead to high surface roughness, due to the balling and partial melting of powders, which cannot satisfy the requirements of design and practical use. Consequently, until there is a significant step-change in the resolution of AM technology, finishing processes will be a necessary step in the additive manufacturing process. In this work, ultrasonic abrasive polishing experiments are conducted with the aim of improving the surface quality of additive manufactured components. The roles of cavitation bubbles and abrasive particles in material removal are discussed. The impact action of abrasive particles is simulated using the Smoothed Particle Hydrodynamics (SPH) method. The effects of ultrasonic output power and the concentration of abrasive suspension on machining characteristics are also examined. It is found that the cavitation bubble collapse in ultrasonic polishing can remove the partially melted structures efficiently, and further roughness improvement could be obtained using the micro-cut and impact of abrasive particles in the slurry. An increase in the ultrasonic output power and abrasive concentration within a certain range lead to a more desirable polishing effect.Additive Manufacturing (AM) technology has developed rapidly over the past two decades. Metal-based AM techniques represented by Powder Bed Fusion (PBF) have advantages, including the production of fine features with great geometrical accuracy and high-strength-to-weight ratios. However, its forming mechanism, based on the melting of metal powders, induces the agglomeration of partially melted powders and a balling phenomenon in the process [1]. Therefore, the average roughness (Ra) of metal-based AM parts is generally higher than 10 µm [2], which not only affects the appearance, but also greatly influences several functional properties, including fatigue resistance, friction performance and heat transfer [3][4][5]. Accordingly, post-process finishing is required to improve the surface quality of AM parts [6,7]. AM parts always have complex shapes and features, which makes the finishing process difficult. Several surface modification processes for AM parts have been reported in the literature. However, each process has limitations and complexities. Implementing hand polishing as one of the main finishing processes for AM parts would increase the labor cost and time, and the surface quality would be poor. Laser polishing, chemical polishing, electrochemical polishing, and abrasive flow polishing have s...

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Comparison of different post processing technologies for SLM generated 316l steel parts

Cited by 116 publications

References 16 publications

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

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

Selective laser melting of a beta-solidifying TNM-B1 titanium aluminide alloy

Material Removal in Ultrasonic Abrasive Polishing of Additive Manufactured Components

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