The key metallurgical features of selective laser melting of stainless steel powder for building metallic part

Li, Ruidi; Shi, Yusheng; Wang, Li; Liu, Jinhui; Wang, Zhigang

doi:10.1007/s11106-011-9311-3

Cited by 16 publications

(9 citation statements)

References 24 publications

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“…The architecture of this layer particle for coarse powder is illustrated in Figure 6 with void area and hollow powder. There is a large void between each particle; meanwhile, the number of hollow powders increased along with the increasing powder particle size [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. Therefore, the layer thickness relative density of coarse powder is relatively low, and more gas components are contained in the powder layer.…”

Section: Resultsmentioning

confidence: 99%

Research on High Layer Thickness Fabricated of 316L by Selective Laser Melting

et al. 2017

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Selective laser melting (SLM) is a potential additive manufacturing (AM) technology. However, the application of SLM was confined due to low efficiency. To improve efficiency, SLM fabrication with a high layer thickness and fine powder was systematically researched, and the void areas and hollow powders can be reduced by using fine powder. Single-track experiments were used to narrow down process parameter windows. Multi-layer fabrication relative density can be reached 99.99% at the exposure time-point distance-hatch space of 120 µs-40 µm-240 µm. Also, the building rate can be up to 12 mm 3 /s, which is about 3-10 times higher than the previous studies. Three typical defects were found by studying deeply, including the un-melted defect between the molten pools, the micro-pore defect within the molten pool, and the irregular distribution of the splashing phenomenon. Moreover, the microstructure is mostly equiaxed crystals and a small amount of columnar crystals. The averages of ultimate tensile strength, yield strength, and elongation are 625 MPa, 525 MPa, and 39.9%, respectively. As exposure time increased from 80 µs to 200 µs, the grain size is gradually grown up from 0.98 µm to 2.23 µm, the grain aspect ratio is close to 1, and the tensile properties are shown as a downward trend. The tensile properties of high layer thickness fabricated are not significantly different than those with a coarse-powder layer thickness of low in previous research.

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Section: Resultsmentioning

confidence: 99%

Research on High Layer Thickness Fabricated of 316L by Selective Laser Melting

et al. 2017

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“…The previous schematic ( Figure 1) is a depiction of the LM process. Although LM is typically used for the fabrication of parts from metallic powders (Abe et al, 2001;Bertrand et al, 2007;Li et al, 2011;) this AM technique was identified as potentially being able to process the regolith ceramic material.…”

Section: Methodsmentioning

confidence: 99%

3D printing with moondust

Goulas

Friel

2016

RPJ

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Purpose -The purpose of this paper is to investigate the effect of the main process parameters of Laser Melting (LM) type Additive Manufacturing (AM) on multi layered structures manufactured from JSC-1A Lunar regolith (Moondust) simulant powder.Design/methodology/approach -Laser diffraction technology was used to analyse and confirm the simulant powder material particle sizes and distribution. Geometrical shapes were then manufactured on a Realizer SLM™ 100 using the simulant powder. The laserprocessed samples were analysed via Scanning Electron Microscopy (SEM) to evaluate surface and internal morphologies, Energy-dispersive X-ray Spectroscopy (EDS) to analyse the chemical composition after processing and the samples were mechanically investigated via Vickers micro-hardness testing.Findings -A combination of process parameters resulting in an energy density value of 1.011 J/mm 2 allowed the successful production of components directly from Lunar regolithsimulant. An internal relative porosity of 40.8 %, material hardness of 670 ± 11 HV and a dimensional accuracy of 99.8 % were observed in the fabricated samples. Originality/value -This research paper is investigating the novel application of a PowderBed Fusion AM process category as a potential on-site manufacturing approach for manufacturing structures/components out of Lunar regolith (Moondust). It was shown that this AM process category has the capability to directly manufacture multi-layered parts out of Lunar regolith, which has potential applicability to future moon colonization.

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“…3b); and (c) when the energy density is excessively low, a series of barely connected metal beads, balling, is observed ( Fig. 3c) (Li et al, 2011;Tolochko et al, 2004). When producing AM parts, only the continuous regime is desired, as this track shape usually leads to good bonding between adjacent lines and results in minimal porosity within the final part.…”

Section: Track Morphologymentioning

confidence: 99%

On the limitations of Volumetric Energy Density as a design parameter for Selective Laser Melting

et al. 2017

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Energy density is often used as a metric to compare components manufactured with Selective Laser Melting (SLM) under different sets of deposition parameters (e.g., laser power, scan speed, layer thickness, etc.). We present a brief review of the current literature on additive manufacturing of 316L stainless steel (SS) related to input parameter scaling relations. From previously published work we identified a range of Volumetric Energy Density (VED) values that should lead to deposition of fully dense parts. In order to corroborate these data, we designed a series of experiments to investigate the reliability of VED as a design parameter by comparing single tracks of 316L SS deposited with variable deposition parameters. Our results show the suitability of VED as a design parameter to describe SLM to be limited to a narrow band of

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The key metallurgical features of selective laser melting of stainless steel powder for building metallic part

Cited by 16 publications

References 24 publications

Research on High Layer Thickness Fabricated of 316L by Selective Laser Melting

Research on High Layer Thickness Fabricated of 316L by Selective Laser Melting

3D printing with moondust

On the limitations of Volumetric Energy Density as a design parameter for Selective Laser Melting

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