Additively Manufactured Al/SiC Cylindrical Structures by Laser Metal Deposition

Riquelme, Ainhoa; Rodrigo, P.; Escalera-Rodriguez, María Dolores; Rams, J.

doi:10.3390/ma13153331

Cited by 8 publications

(3 citation statements)

References 35 publications

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“…In the case of the DLD process, the used AM equipment consisted of a continuous wave diode laser (ROFIN DL013S, Hamburg, Germany) with a wavelength of 940 nm and a coaxial nozzle for the powder (IWS COAX 8 from Fraunhofer) [ 29 ]. The 316L powder was sprayed coaxially with the laser beam through a nozzle and the powder focus was 13 mm below the nozzle tip.…”

Section: Methodsmentioning

confidence: 99%

Comparison of Different Additive Manufacturing Methods for 316L Stainless Steel

et al. 2021

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In additive manufacturing (AM), the technology and processing parameters are key elements that determine the characteristics of samples for a given material. To distinguish the effects of these variables, we used the same AISI 316L stainless steel powder with different AM techniques. The techniques used are the most relevant ones in the AM of metals, i.e., direct laser deposition (DLD) with a high-power diode laser and selective laser melting (SLM) using a fiber laser and a novel CO2 laser, a novel technique that has not yet been reported with this material. The microstructure of all samples showed austenitic and ferritic phases, which were coarser with the DLD technique than for the two SLM ones. The hardness of the fiber laser SLM samples was the greatest, but its bending strength was lower. In SLM with CO2 laser pieces, the porosity and lack of melting reduced the fracture strain, but the strength was greater than in the fiber laser SLM samples under certain build-up strategies. Specimens manufactured using DLD showed a higher fracture strain than the rest, while maintaining high strength values. In all the cases, crack surfaces were observed and the fracture mechanisms were determined. The processing conditions were compared using a normalized parameters methodology, which has also been used to explain the observed microstructures.

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Section: Methodsmentioning

confidence: 99%

Comparison of Different Additive Manufacturing Methods for 316L Stainless Steel

et al. 2021

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“…Several scholars have analyzed the influence of LMD process parameters, including laser power, scanning speed, and powder flow rate, on the properties of the fabricated or remanufactured parts to increase the quality and reliability of these parts. Riquelme et al [6] have investigated the influence of laser power and scanning speed on the microstructure of Al/SiCp composites during LMD and evaluated the wear behavior and microhardness of the fabricated parts. Eo et al [2] have studied the effects of the melt pool oxidation and inclusion characteristics of LMD 316L stainless steel on the mechanical properties and their relation to laser power, scanning speed, and powder chemistry.…”

Section: Introductionmentioning

confidence: 99%

Impact of Pulsed Laser Parameters and Scanning Pattern on the Properties of Thin-Walled Parts Manufactured Using Laser Metal Deposition

et al. 2022

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The quality of parts manufactured using laser metal deposition (LMD), similar to other additive manufacturing methods, is influenced by processing parameters. Such parameters determine geometric stability, favorable microstructures, and good mechanical properties. This study aimed to investigate the effects of pulsed laser parameters (duty cycle and pulse frequency) and scanning patterns (unidirectional and bidirectional patterns) on the properties of parts fabricated using LMD. Results show that the properties of the LMD-fabricated parts are obviously influenced by pulsed laser parameters and scanning patterns. Using the unidirectional scanning pattern in both pulsed laser parameters enhances the properties of the thin-walled parts prepared using LMD. An increase in duty cycle can improve geometric stability, increase grain size, and reduce microhardness. Furthermore, the geometric stability does not vary considerably with the use of different frequencies, but the microstructure of fabricated parts shows various grain sizes with different pulse frequencies. In addition, the microhardness increases as the frequency increases from 13.33 to 50 Hz. In general, the influence of the duty cycle on geometric properties is greater than that of frequency. Meanwhile, the impact of frequency on microhardness is greater than that of the duty cycle.

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“…Efficient approaches, such as the addition of alloying elements [ 4 , 5 ], surface modification [ 6 , 7 ], and novel fabrication processes [ 8 , 9 ] can be used to improve wettability and regulate interfacial reactions. In recent studies, the innovative fabrication methods have focused on the interface which has been promoted a large improvement on the mechanical properties of ceramic-reinforced Al matrix composites; for instance, accumulative roll bonding [ 10 , 11 ], powder metallurgy technique [ 12 , 13 ], liquid metal infiltration [ 14 , 15 ], selective laser melting [ 16 , 17 ], plasma spraying [ 18 , 19 ], in situ growth [ 20 , 21 ], and special casting. All the above routes enhanced wettability or inhibited interfacial reactions, improving the properties to some extent.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Al Matrix Composite Enhanced by In Situ Formed SiC, MgAl2O4, and MgO via Casting Process

Jiao

Zhu

et al. 2021

Materials

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Al matrix composite, reinforced with the in situ synthesized 3C–SiC, MgAl2O4, and MgO grains, was produced via the casting process using phenolic resin pyrolysis products in flash mode. The contents and microstructure of the composites’ fracture characteristics were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Mechanical properties were tested by universal testing machine. Owing to the strong propulsion formed in turbulent flow in the pyrolysis process, nano-ceramic grains were formed in the resin pyrolysis process and simultaneously were homogeneously scattered in the alloy matrix. Thermodynamic calculation supported that the gas products, as carbon and oxygen sources, had a different chemical activity on in situ growth. In addition, ceramic (3C–SiC, MgAl2O4, and MgO) grains have discrepant contents. Resin pyrolysis in the molten alloy decreased oxide slag but increased pores in the alloy matrix. Tensile strength (142.6 ± 3.5 MPa) had no change due to the cooperative action of increased pores and fine grains; the bending and compression strength was increasing under increased contents of ceramic grains; the maximum bending strength was 378.2 MPa in 1.5% resin-added samples; and the maximum compression strength was 299.4 MPa. Lath-shaped Si was the primary effect factor of mechanical properties. The failure mechanism was controlled by transcrystalline rupture mechanism. We explain that the effects of the ceramic grains formed in the hot process at the condition of the resin exist in mold or other accessory materials. Meanwhile, a novel ceramic-reinforced Al matrix was provided. The organic gas was an excellent source of carbon, nitrogen, and oxygen to in situ ceramic grains in Al alloy.

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Additively Manufactured Al/SiC Cylindrical Structures by Laser Metal Deposition

Cited by 8 publications

References 35 publications

Comparison of Different Additive Manufacturing Methods for 316L Stainless Steel

Comparison of Different Additive Manufacturing Methods for 316L Stainless Steel

Impact of Pulsed Laser Parameters and Scanning Pattern on the Properties of Thin-Walled Parts Manufactured Using Laser Metal Deposition

Mechanical Properties of Al Matrix Composite Enhanced by In Situ Formed SiC, MgAl2O4, and MgO via Casting Process

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