Laser Powder Bed Fusion of Aluminum Alloys

Manfredi, Diego; Bidulský, Róbert

doi:10.12776/ams.v23i3.988

Cited by 33 publications

(24 citation statements)

References 27 publications

(38 reference statements)

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“…To date, a wide range of materials have been processed by SLM, including stainless steels [5][6][7], Ni-based alloys [8][9][10], Ti-based alloys [11][12][13] and Al-based alloys [14][15][16]. Various reports have suggested improvements in mechanical properties for AM-fabricated parts compared to that of their traditional counterparts, including higher yield and tensile strengths [17,18], better corrosion resistance [19][20][21] and enhanced fatigue life [22].…”

Section: Introductionmentioning

confidence: 99%

Effect of sample orientation on the microstructure and microhardness of additively manufactured AlSi10Mg processed by high-pressure torsion

Yusuf

Hoegden

Gao

2020

Int J Adv Manuf Technol

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For the first time, high-pressure torsion (HPT) was applied to additively manufactured AlSi10Mg built in two directions (vertical and horizontal) by selective laser melting (SLM), and the influence of extreme torsional strain on the porosity, microstructure and microhardness of the alloy was investigated. ImageJ analysis indicates that significant porosity reduction is achieved by 1/4 HPT revolution (low strain). Optical microscopy (OM) and scanning electron microscopy (SEM) observations reveal the steady distortion and elongation of the melt pools, the continuous elongation of the cellular-dendritic Al matrix and breakage of the eutectic Si phase network with increased HPT revolutions. Microhardness measurements indicate that despite the significant increase in hardness attained from HPT processing, hardness saturation and microstructural homogeneity are not achieved even after 10 HPT revolutions. X-ray diffraction (XRD) line broadening analysis demonstrates increased dislocation densities with increased HPT revolutions, which contributes to the considerably higher hardness values compared to as-received samples.

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Section: Introductionmentioning

confidence: 99%

Effect of sample orientation on the microstructure and microhardness of additively manufactured AlSi10Mg processed by high-pressure torsion

Yusuf

Hoegden

Gao

2020

Int J Adv Manuf Technol

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“…The milled powder was dried at 120 o C for 24 hours and then calcined at 1100 o C for 2 hours. As-received powders were fine but not showed spherical shape like other alloys [19]. The obtained powder was sintered by PECS machine (LABOX 1550i75S, Japan) in a graphite die with diameter of 10 mm, with a heating rate of 100 o C/min and a uniaxial pressure of 100 MPa.…”

Section: Methodsmentioning

confidence: 99%

FABRICATION OF TRANSPARENT MgAl2O4 SPINEL CERAMICS BY PECS PROCESSING OF COMBUSTION - SYTHESIZED NANOPOWDERS

Nguyen

Dao

et al. 2019

Acta Metall Slovaca

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Transparent MgAl2O4 ceramic could be found in a wide range of applications for both military and civil sector due to its high melting point, good mechanical properties, small refractive index (1.71) and its ability to allow light in range from UV to mid-IR to pass through. In the present work, transparent MgAl2O4 was fabricated from metal nitrates via two steps. Firstly, the MgAl2O4 nanopowder was synthesized via solution combustion synthesis from the metal nitrates. Secondly, the powder was then consolidated by Pulsed Electric Current Sintering (PECS) technique to fabricate transparent ceramic. XRD patterns of the obtained powder showed the peaks of only MgAl2O4 phase. Besides, the atomic compositions of magnesium, aluminium and oxygen determined by EDX analysis were approximately corresponded to 1:2:4 of the molecular formula of MgAl2O4. After deagglomerating for 48 hours using soft ball-milling, the powder had the average particle of 27 nm. Transparent MgAl2O4 samples, which were sintered with two-step sintering mode of 1050oC/60 minutes-1400oC/20 minutes, permitted the transmission of visible and infrared light with the transmittance up to 80%, Vickers hardness of 14.2 GPa, and fracture toughness of 1.1 MPa.m1/2. The results are a critical step toward fabrication of high-quality transparent ceramics from metal nitrates.

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“…Additive manufacturing (AM) technologies are currently considered to be a very promising solution to overcome such challenges, representing a quasi-pristine field of research for both metallurgists and process engineers. AM processes are a stimulating innovation, mainly in component design, enabling the manufacture of components not feasible via traditional methods [1,2].…”

Section: Introductionmentioning

confidence: 99%

Case Study of the Tensile Fracture Investigation of Additive Manufactured Austenitic Stainless Steels Treated at Cryogenic Conditions

Bidulský

Bidulská

Gobber³

et al. 2020

Materials

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Additive manufacturing is a key enabling technology in the manufacture of highly complex shapes, having very few geometric limitations compared to traditional manufacturing processes. The present paper aims at investigating mechanical properties at cryogenic temperatures for a 316L austenitic stainless steel, due to the wide possible cryogenic applications such as liquid gas confinement or superconductors. The starting powders have been processed by laser powder bed fusion (LPBF) and tested in the as-built conditions and after stress relieving treatments. Mechanical properties at 298, 77 and 4.2 K from tensile testing are presented together with fracture surfaces investigated by field emission scanning electron microscopy. The results show that high tensile strength at cryogenic temperature is characteristic for all samples, with ultimate tensile strength as high as 1246 MPa at 4.2 K and 55% maximum total elongation at 77 K. This study can constitute a solid basis for investigating 316L components by LPBF for specific applications in cryogenic conditions.

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Laser Powder Bed Fusion of Aluminum Alloys

Cited by 33 publications

References 27 publications

Effect of sample orientation on the microstructure and microhardness of additively manufactured AlSi10Mg processed by high-pressure torsion

Effect of sample orientation on the microstructure and microhardness of additively manufactured AlSi10Mg processed by high-pressure torsion

FABRICATION OF TRANSPARENT MgAl2O4 SPINEL CERAMICS BY PECS PROCESSING OF COMBUSTION - SYTHESIZED NANOPOWDERS

Case Study of the Tensile Fracture Investigation of Additive Manufactured Austenitic Stainless Steels Treated at Cryogenic Conditions

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