On the effect of scanning strategies in the selective laser melting process

Jhabvala, Jamasp; Boillat, Éric; Antignac, Thibaud; Glardon, Rémy

doi:10.1080/17452751003688368

Cited by 105 publications

(69 citation statements)

References 13 publications

(11 reference statements)

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“…This is consistent with other studies, and suggests that low laser power and high scan speed produce low density parts [29,42,43]. The lowest density part, which exhibited a porosity of 38.13 %, was fabricated by using a laser power of 30W and scan speed of 1200 mm/s.…”

Section: Discussionsupporting

confidence: 75%

Electrical conductivity and porosity in stainless steel 316L scaffolds for electrochemical devices fabricated using selective laser sintering

Ibrahim

Brandon

2016

Materials & Design

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Battery electrode microstructures must be porous, to provide a large active surface area to facilitate fast charge transfer kinetics. In this work, we describe how a novel porous electrode scaffold, made from stainless steel 316L powder can be fabricated using selective laser sintering by proper selection of process parameters. Porosity, electrical conductivity and optical microscopy measurements were used to investigate the properties of fabricated samples. Our results show that a laser energy density between 1.50-2.00 J/mm 2 leads to a partial laser sintering mechanism where the powder particles are partially fused together, resulting in the fabrication of electrode scaffolds with 10% or higher porosity. The sample fabricated using 2.00 J/mm 2 energy density (60W -1200 mm/s) exhibited a good electrical conductivity of 1.80 x 10 6 S/m with 15.61% of porosity. Moreover, we have observed the porosity changes across height for the sample fabricated at 60W and 600 mm/s, 5.70% from base and increasing to 7.12% and 9.89% for each 2.5 mm height toward the top surface offering graded properties ideal for electrochemical devices, due to the changing thermal boundary conditions. These highly porous electrode scaffolds can be used as an electrode in electrochemical devices, potentially improving energy density and life cycle.

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Section: Discussionsupporting

confidence: 75%

Electrical conductivity and porosity in stainless steel 316L scaffolds for electrochemical devices fabricated using selective laser sintering

Ibrahim

Brandon

2016

Materials & Design

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“…Scanning strategies are defined in the literature by Jhabvala et al [32] and Mertens et al [33] as having two parts: scan parameters, and a scan pattern. Simchi [22] states that the scanning strategy includes the length of a scan vector and the method of irradiation between successive layers.…”

Section: Overview Of Scan Strategiesmentioning

confidence: 99%

The Effects of Selective Laser Melting Scan Strategies on Deviation of Hybrid Parts

Hagedorn-Hansen¹,

Bezuidenhout²,

Dimitrov³

et al. 2017

SAJIE

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The use of additive manufacturing to produce intricate part geometries in the aerospace, medical, and tool-and-die industries is increasingly incorporated in manufacturing process chains. However, the high costs, long production times, and material integrity issues associated with additive manufacturing technologies such as selective laser melting make the process suitable only for certain applications. In order to reduce selective laser melting production costs for selected parts, a combination of selective laser melting and milling can be used. Metal parts produced with this method are referred to as hybrid parts. A challenge in producing hybrid parts is to reduce the geometrical deviation due to processinduced warping. This paper discusses the effects of various laser scan strategies on the deviation of hybrid parts. A newly developed scan strategy is experimentally compared with its commercial counterpart with regard to as-built part warping and porosity. The novel strategy resulted in a significant reduction in warping and porosity. OPSOMMINGDie benutting van toevoegingsvervaardiging vir die produksie van komplekse onderdeel geometrieë in die lugvaart, mediese, en werktuig industrieë word toenemend geïnkorporeer in vervaardigingsproseskettings. Gepaardgaande hoë kostes, lang produksietye, en materiaal integriteitstekortkominge met toevoegingsvervaardiging tegnologieë soos selektiewe laser smelting veroorsaak dat die proses slegs uitvoerbaar is vir sekere toepassings. Ten einde selektiewe laser smelting produksiekoste te verminder vir geselekteerde onderdele, kan 'n kombinasie van selektiewe laser smelting en freesmasjinering geïmplementeer word. Metaal onderdele wat met so kombinasie geproduseer word, word na verwys as hibried onderdele. 'n Uitdaging in die vervaardiging van hibried onderdele is om geometriese afwyking deur skeeftrekking wat deur die proses veroorsaak word, te verminder. Hierdie artikel bespreek die effekte van verskeie laser skandeer strategieë op die afwyking van hibried onderdele. 'n Nuut ontwikkelde skandeer strategie is eksperimenteel vergelyk met 'n kommersiële eweknie met betrekking tot skeeftrekking en porositeit. Die skeeftrekking en porositeit van die nuut uitgevonde strategie is beduidend laer.

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“…It has the advantage of being the easiest to generate from a CAD file. Three other strategies have been investigated in [20].…”

Section: Resultsmentioning

confidence: 99%

“…It is also well suited for SLM because of its high thermal conductivity and diffusivity. Experiments with a low-conductive powder (tungsten carbide coated with stainless steel [19]) have been carried out in [20].…”

Section: The Powdermentioning

confidence: 99%

On the use of EBSD analysis to investigate the microstructure of gold samples built by selective laser melting

2011

Self Cite

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In the selective laser melting process, the scanning strategies have a deep impact on the final microstructures. In this paper, we point out the benefits of using EBSD techniques to characterize the scanning strategies on 18-carat gold samples. For a given scanning strategy, different microstructures and orientation can be achieved, due to the change of the thermal gradients. The results are compared with numerical simulations.

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On the effect of scanning strategies in the selective laser melting process

Cited by 105 publications

References 13 publications

Electrical conductivity and porosity in stainless steel 316L scaffolds for electrochemical devices fabricated using selective laser sintering

Electrical conductivity and porosity in stainless steel 316L scaffolds for electrochemical devices fabricated using selective laser sintering

The Effects of Selective Laser Melting Scan Strategies on Deviation of Hybrid Parts

On the use of EBSD analysis to investigate the microstructure of gold samples built by selective laser melting

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