Influence of re-melting on surface roughness and porosity of AlSi10Mg parts fabricated by selective laser melting

Yu, Wenhui; Sing, Swee Leong; Chua, Chee Kai; Tian, Xuelei

doi:10.1016/j.jallcom.2019.04.017

Cited by 258 publications

(74 citation statements)

References 48 publications

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“…[20] Li et al [21] successfully fabricated crack-free Al 85 Ni 5 Y 6 Co 2 Fe 2 bulk metallic glass composites by re-scanning with low-energy density. On the contrary, SLRM also improves the relative density and surface quality of components, [22][23][24] and forms the shallower molten pools from melting previously obtained columnar crystals, thus fine grains were achieved. [23] During the SLM process, Gustmann et al [22] argued that the remelting procedure altered the microstructure and the properties in shape-memory alloy without compromising the relative density and proved to be an interesting tool for related alloys to optimize their performance without additional postprocessing steps.…”

Section: Doi: 101002/adem201901352mentioning

confidence: 96%

“…successfully fabricated crack‐free Al 85 Ni 5 Y 6 Co 2 Fe 2 bulk metallic glass composites by re‐scanning with low‐energy density. On the contrary, SLRM also improves the relative density and surface quality of components, and forms the shallower molten pools from melting previously obtained columnar crystals, thus fine grains were achieved . During the SLM process, Gustmann et al .…”

Section: Introductionmentioning

confidence: 99%

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Selective Laser Melting and Remelting of Pure Tungsten

et al. 2020

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The processing of pure tungsten encounters a substantial challenge due to its high melting point and intrinsic brittleness. Selective laser melting (SLM) technique is gaining popularity and offers an excellent processing approach for refractory metals. Herein, dense pure tungsten specimens are produced by optimizing SLM processing parameters. The mechanical property of the SLM‐produced tungsten with an ultimate compressive strength of about 1200 MPa, which is obviously superior to that reported in other literature, is achieved. The increased laser energy input is instrumental in raising density and surface roughness of tungsten specimens. Interestingly, additional remelting of processed layers during SLM improves the surface quality and the microstructure and achieves the highest relative density (98.4% ± 0.5%). After laser remelting, the surface roughness is reduced by 28% and a large number of fine grains are obtained. The flow of fluids caused by remelting plays a decisive role in the formation of fine grains and the defect level. Therefore, these findings offer a new insight into SLM of pure tungsten.

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Section: Doi: 101002/adem201901352mentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Selective Laser Melting and Remelting of Pure Tungsten

et al. 2020

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“…Selective laser remelting (SLR) has been applied to scan the same slice two or more times, and offers a solution to improve the quality of parts. The applications and challenges of this technique have been well reviewed [10][11][12][13][14][15]. Yu et al [10] proposed a remelting strategy in the same and opposite directions to the first scanning routine to fabricate AlSi10Mg parts.…”

Section: Introductionmentioning

confidence: 99%

“…The applications and challenges of this technique have been well reviewed [10][11][12][13][14][15]. Yu et al [10] proposed a remelting strategy in the same and opposite directions to the first scanning routine to fabricate AlSi10Mg parts. Liu et al [11] proposed a new process: powders were premelted using low laser power, and then the powders were melted again by using a high-power laser to realize the remelting process layer by layer.…”

Section: Introductionmentioning

confidence: 99%

A new two-step selective laser remelting of 316L stainless steel: process, density, surface roughness, mechanical properties, microstructure

Zhang

Haiyi

et al. 2020

Mater. Res. Express

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A new two-step selective laser remelting (SLR) process was proposed to fabricate 316L stainless steel. The density, surface roughness, and mechanical properties were investigated by a multifunctional density tester, surface roughness meter, and tensile testing machine. Compared with the single-melting selective laser melting (SLM) process, the relative density, surface roughness (R a ), ultimate tensile strength, yield strength, elastic modulus, and elongation reached 99.31%, 6.67 μm, 725 MPa, 643 MPa, 13.95 GPa, and 40.8%, respectively. In addition, the microstructure and fracture characteristics were studied by OM, SEM, and EDS. The results showed little unmelted powder and fewer defects (balling, spatter, and cracks). In addition, a closer and smoother connection between the welds and equiaxed cell were obtained by the SLR process.

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“…The surface quality is influenced by the size and shape of the feedstock particles, as well as by numerous processing parameters including energy density, building orientation and layer thickness. Also hatching distance, scan pattern and re-melting strategies, and even gravity may affect the surface quality [21][22][23]. Although it is possible to improve the surface finish through the appropriate choice of starting powder and processing conditions, the surface roughness of as-built parts is usually in the 25-35 µm range [20].…”

Section: Introductionmentioning

confidence: 99%

On the Effectiveness of Different Surface Finishing Techniques on A357.0 Parts Produced by Laser-Based Powder Bed Fusion: Surface Roughness and Fatigue Strength

Denti

Sola

2019

Metals

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Laser-based powder bed fusion (L-PBF) is an additive manufacturing (AM) technique that uses a computer-controlled laser beam as the energy source to consolidate a metal powder according to a layer-upon-layer strategy in order to manufacture a three dimensional part. This opens the way for an unprecedented freedom in geometry, but the layer-wise build-up strategy typically results in a very poor surface finish, which is affected by the staircase effect and by the presence of partially molten particles. Surface finishing treatments are therefore necessary to obtain an adequate surface finish, to improve the fatigue behavior and to meet mechanical and aesthetic needs. The present contribution systematically compares numerous surface finishing techniques, including laser shock processing, plastic media blasting, sand blasting, ceramic shot peening and metal shot peening with steel particles of different sizes (ϕ = 0.2 mm and ϕ = 0.4 mm). The results show that all the proposed methods improve the surface quality and the fatigue life of A357.0 L-PBF parts. However, the achievement of the lowest surface roughness does not necessarily correspond to the best fatigue performance, thus suggesting that multiple mechanisms may be active and that besides surface roughness also residual stresses contribute to increase the fatigue strength.

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Influence of re-melting on surface roughness and porosity of AlSi10Mg parts fabricated by selective laser melting

Cited by 258 publications

References 48 publications

Selective Laser Melting and Remelting of Pure Tungsten

Selective Laser Melting and Remelting of Pure Tungsten

A new two-step selective laser remelting of 316L stainless steel: process, density, surface roughness, mechanical properties, microstructure

On the Effectiveness of Different Surface Finishing Techniques on A357.0 Parts Produced by Laser-Based Powder Bed Fusion: Surface Roughness and Fatigue Strength

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