Processing conditions and microstructural features of porous 316L stainless steel components by DMLS

Gu, Dongdong; Shen, Yifu

doi:10.1016/j.apsusc.2008.06.118

Cited by 113 publications

(55 citation statements)

References 27 publications

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“…Balling is a severe impediment in the layers' bonding, decreasing the density of the part and increasing the surface roughness [42]. Increasing the temperature of the powder bed can increase permeability, thereby reducing the balling phenomenon [43]. However, the scope of this work is to find the influence of the laser scanning strategies on the surface properties; thus, it is intended to contribute to the enhancement of the process in addition to other aspects in parameters modification that have been studied before.…”

Section: Scanning Electron Microscopementioning

confidence: 99%

Permeability Study of Austenitic Stainless Steel Surfaces Produced by Selective Laser Melting

Segura-Cárdenas

Ramírez-Cedillo

Sandoval-Robles

et al. 2017

Metals

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Selective laser melting (SLM) is emerging as a versatile process for fabricating different metal components with acceptable mechanical properties and geometrical accuracy. The process has been used in the manufacturing of several parts (e.g., aerospace or biomedical components), and offers the capability to tailor the performance of several surface and mechanical properties. In this work, permeability properties and surface roughness of stainless steel (SS316L) surfaces were evaluated through experimentation with three different laser scanning patterns (chessboard, meander, and stripe), and different sloping angles between the fabricated surface and the laser beam incident on the process. Results showed that for each scanning pattern, the roughness decreased as the sloping angle increased consistently in all experimental trials. Furthermore, in the case of the permeability evaluation, the manufactured surfaces showed changes in properties for each series of experiments performed with different scanning patterns. The chessboard pattern showed a change of 67 • to 107 • in contact angle, while the meander and stripe patterns showed a variation in contact angle in a range of 65 • to 85 • . The different scanning strategies in the SLM process resulted in an alternative method for surface enhancement with different hydrophobicity properties, valuable for designing the most appropriate permeability characteristics for specific applications.

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Section: Scanning Electron Microscopementioning

confidence: 99%

Permeability Study of Austenitic Stainless Steel Surfaces Produced by Selective Laser Melting

Segura-Cárdenas

Ramírez-Cedillo

Sandoval-Robles

et al. 2017

Metals

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show abstract

“…The advantages of this technique are in selectivity of location, time and energy economy, flexibility, versatility, automation worthiness, and faster heating and cooling rate including transient heating to elevated temperature [15]. Depending on the way in which synthesis by laser radiation was conducted, different processing methods are applied nowadays: selective laser sintering (SLS) [16,17], direct laser sintering (DLS) [18,19], laser micro-sintering (LMS) [20], green compact laser sintering (GCLS) [21], selective laser melting (SLM) [16] and direct laser melting (DLM) [22].…”

Section: Introductionmentioning

confidence: 99%

Laser sintering of Cu–Zr–ZrB2 composite

Stašić

Trtica

Rajković

et al. 2014

Applied Surface Science

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“…Most of these studies are focused on laser-assisted sintering technique. Gu and Shen [20] studied the processing conditions and microstructural features of porous SS316L by directed metal laser sintering. Li et al [21,22] focused on the densification behavior of metal powders and its effects on the fabrication of graded porous structures during selective laser sintering.…”

Section: Introductionmentioning

confidence: 99%

Studies on laser rapid manufacturing of cross-thin-walled porous structures of Inconel 625

Paul

Mishra

Premsingh

et al. 2011

Int J Adv Manuf Technol

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An in-house developed continuous wave CO 2 laser-based rapid manufacturing was deployed to fabricate porous structures of Inconel-625 using a new cross-thinwall fabrication strategy. Studies on the mechanical and metallurgical properties of these porous structures were carried out with laser energy per unit traverse length in the range of 150-300 kJ/m, powder fed per unit traverse length in the range of 16.67-36.67 g/m and transverse traverse index in the range of 0.7-1.3. The processing parametric dependence showed that the powder fed per unit traverse length was a predominating parameter in determining the porosity of the structures, followed by transverse traverse index and laser energy per unit traverse length. The compression testing of fabricated porous structures showed that the material had anisotropy up to 20% for 0.2% yield strength. It was found that the yield strength of the fabricated structures followed the power law and decreased from 423±8 MPa for 2.63±0.14% porosity to 226± 6.8 MPa for 11.57±0.52% porosity. Scanning electron microscopy showed that shape of the pores was triangular due to the cross-thin-wall fabrication strategy and the observed values of microhardness were in the range 256-370 VHN 0.98N . These studies are expected to augment our knowledge on the fabrication of porous structures with independent control on porosity and yield strength, which are important prerequisites for some of the prosthetic and engineering components in niche areas of applications.

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Processing conditions and microstructural features of porous 316L stainless steel components by DMLS

Cited by 113 publications

References 27 publications

Permeability Study of Austenitic Stainless Steel Surfaces Produced by Selective Laser Melting

Permeability Study of Austenitic Stainless Steel Surfaces Produced by Selective Laser Melting

Laser sintering of Cu–Zr–ZrB2 composite

Studies on laser rapid manufacturing of cross-thin-walled porous structures of Inconel 625

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