Effect of the Thermodynamic Behavior of Selective Laser Melting on the Formation of In situ Oxide Dispersion-Strengthened Aluminum-Based Composites

Wang, Lianfeng; Jue, Jiubin; Xia, Mujian; Guo, Liang; Yan, Biao; Gu, Dongdong

doi:10.3390/met6110286

Cited by 36 publications

(17 citation statements)

References 25 publications

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“…Extremely high cooling rates inherent in SLM allow this phenomenon to be successfully avoided and allow a uniform distribution of reinforced particles to be obtained, as it was accomplished on the powder mixing/milling stage. Jue et al [ 63 , 80 ] also considered the distribution of alumina in the Al matrix specifically for SLM, taking into account the Marangoni convection and induced liquid capillary forces that accelerate the particle rearrangement, making it possible to obtain a homogeneous structure after SLM. Han et al [ 84 ] studied the melting pool temperature during SLM with a 200 W laser power.…”

Section: Melting Pool Behaviormentioning

confidence: 99%

Selective Laser Melting of Al-Based Matrix Composites with Al2O3 Reinforcement: Features and Advantages

et al. 2021

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Aluminum matrix composites (AMC) are of great interest and importance as high-performance materials with enhanced mechanical properties. Al2O3 is a commonly used reinforcement in AMCs fabricated by means of various technological methods, including casting and sintering. Selective laser melting (SLM) is a suitable modern method of the fabrication of net-shape fully dense parts from AMC with alumina. The main results, achievements, and difficulties of SLM applied to AMCs with alumina are discussed in this review and compared with conventional methods. It was shown that the initial powder preparation, namely the particle size distribution, sphericity, and thorough mixing, affected the final microstructure and properties of SLMed materials drastically. The distribution of reinforcing particles tends to consolidate the near-melting pool-edges process because of pushing by the liquid–solid interface during the solidification process that is a common problem of various fabrication methods. The achievement of an homogeneous distribution was shown to be possible through both the thorough mixing of the initial powders and the precise optimization of SLM parameters. The strength of the AMCs fabricated by the SLM method was relatively low compared with materials produced by conventional methods, while for superior relative densities of more than 99%, hardness and tribological properties were obtained, making SLM a promising method for the Al-based matrix composites with Al2O3.

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Section: Melting Pool Behaviormentioning

confidence: 99%

Selective Laser Melting of Al-Based Matrix Composites with Al2O3 Reinforcement: Features and Advantages

et al. 2021

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“…Rosenthal et al [28], also reported a decline in the ductility that is inversely proportional to the strain rate, which suggests the effects of confined strain rate hardening had not taken place, and that the existence of the silicon phase could be predominantly the reason for this conduct. Brandao et al [29] used stress relief to prevent the residual stress from distorting the components. The effect was the same as in this work, as it led to a drastic decrease in the static yield strength.…”

Section: Tensile Strength After Stress Relievingmentioning

confidence: 99%

The Effect of Stress Relief on the Mechanical and Fatigue Properties of Additively Manufactured AlSi10Mg Parts

Mfusi

Mathe

Tshabalala

et al. 2019

Metals

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The heating and cooling profiles experienced during laser additive manufacturing results in residual stresses build up in the component. Therefore, it is necessary to perform post build stress relieving towards the retention and improvement of the mechanical properties. However the thermal treatments for conventional manufacturing do not seem to completely accommodate these rapid heating and cooling cycles of laser processing techniques such as powder bed fusion. Characterizations such as density measurements on the samples were performed employing the Archimedes principle; hardness testing was performed on the Zwick micro/macro (Hv) hardness tester, SEM and Electron backscatter diffraction (EBSD). Fracture toughness and crack growth was conducted on a fatigue crack machine. All characterization was done after stress relieving of Selective Laser Melting (SLM) produced samples at 300 °C for 2 hrs was performed in a furnace. The mechanical properties appear to be rather compromised instead of being enhanced desirably. As-built SLM produced tensile specimens built in different directions exhibited significantly favorable mechanical properties. However, post stress relieve thermal treatment technique deteriorated the strength while increasing the ductility significantly. Nonetheless, fatigue crack growth and fracture toughness illustrated positive outcome in terms of fatigue life on SLM produced AlSi10Mg components in application.

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“…In the recent years, the in situ approach for AM gained much attention among researches. [ 11–25 ] For instance, Promakhov et al [ 24 ] produced Inconel 625/TiB 2 MMC material applying self‐propagating high‐temperature synthesis (SHS). Obtained blocks were grinded to a coarse powder and then plasma spheroidized yielding spherical particles with TiB 2 reinforcements of 0.5–5 μm size.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing Fe–TiC Composite Powder via Inert Gas Atomization by Forming Reinforcement Phase In Situ

et al. 2020

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Metal matrix composites (MMCs) are materials that have a ductile matrix reinforced with a hard ceramic phase. This combination gives advanced mechanical and functional properties, such as high yield and tensile strength, modulus, and wear resistance. [1-4] Therefore, these materials are widely utilized in automotive, aerospace, medicine, and other high-tech industries. Traditionally, MMC materials are fabricated via the powder metallurgy route, where metal and ceramic powders are premixed and then sintered. [5] As the reinforcement phase, carbides, oxides, nitrides, and borides are normally implemented. Due to the rapid development of the additive manufacturing (AM) market, there is a demand for new materials that can be fabricated additively including MMCs. Moreover, MMCs are normally hard to machine adjusting a semiproduct to a final shape. Thus, manufacturing a nearnet-shape MMC product is an attractive solution, which can further promote the introduction of AM techniques. Dadbakhsh et al. [6] reviewed several attempts of MMC manufacturing via laser powder bed fusion (L-PBF) dealing with Al-, Ti-, and steel-based materials. Specifically, Yuan et al. [7] produced AlSi10Mg-5.8 vol% TiC composite material finding the optimal parameters for the sufficient distribution of the TiC-phase during a L-PBF process. Gu et al. [8] fabricated the Ti/TiC composite revealing a dependence of the reinforcement phase shape and its distribution in the matrix on the L-PBF process parameters and TiC content (up to 22.5 wt%). AlMangour et al. [9] investigated 316 L/TiC MMC with varying reinforcement phase content from 2.5 to 15 vol%. These examples describe the ex situ addition of the reinforcement phase to the matrix by mixing metal and TiC powders prior to the printing process. As an alternative, it is possible to fabricate the reinforcement phase in situ bringing needed elements in contact. Tjong et al. [10] summarized the benefits of in situ formation of the reinforcement phase: enhanced thermodynamic stability, strong interfacial bonding, sufficient reinforcement phase distribution, and refinement, which further improve the mechanical properties of MMC. In the recent years, the in situ approach for AM gained much attention among researches. [11-25] For instance, Promakhov et al. [24] produced Inconel 625/TiB 2 MMC material applying self-propagating high-temperature synthesis (SHS). Obtained blocks were grinded to a coarse powder and then plasma spheroidized yielding spherical particles with TiB 2 reinforcements of 0.5-5 μm size. Thereby, this powder was successfully utilized for test samples fabrication by direct laser deposition technique (DLD). AlMangour et al. [12] utilized for L-PBF mechanically alloyed composite powder. For this experiment, 316L-Ti-graphite mixed powders were milled for 35 h

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Effect of the Thermodynamic Behavior of Selective Laser Melting on the Formation of In situ Oxide Dispersion-Strengthened Aluminum-Based Composites

Cited by 36 publications

References 25 publications

Selective Laser Melting of Al-Based Matrix Composites with Al2O3 Reinforcement: Features and Advantages

Selective Laser Melting of Al-Based Matrix Composites with Al2O3 Reinforcement: Features and Advantages

The Effect of Stress Relief on the Mechanical and Fatigue Properties of Additively Manufactured AlSi10Mg Parts

Manufacturing Fe–TiC Composite Powder via Inert Gas Atomization by Forming Reinforcement Phase In Situ

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