Effects of heat treatment on microstructures and tensile properties of IN718/TiC nanocomposite fabricated by selective laser melting

Yao, Xiling; Moon, Seung Ki; Lee, Bing Yang; Bi, Guijun

doi:10.1007/s12541-017-0197-y

Cited by 67 publications

(5 citation statements)

References 37 publications

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“…Parts showed a remarkable improvement in mechanical properties (ultimate tensile strength: (633 ± 34) MPa vs. (1,207 ± 4) MPa, elongation at break: (1.3 ± 0.3) % vs. (5.7 ± 0.2) %) as compared to specimen produced from the non-functionalized feedstock. Yao et al (2017), reported the manufacture of near fully dense TiC matrix-reinforced Inconel 718 parts characterized by a refined microstructure from a composite powder produced by dry coating of gas atomized IN718 with TiC nanoparticles using a tumbling mixer. Specimens built from the composite powder showed an improved tensile strength due the grain refinement.…”

Section: Nickel Alloy Feedstock Powdersmentioning

confidence: 99%

Dry powder coating in additive manufacturing

Schmidt

Peukert

2022

Front. Chem. Eng.

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Dry powder coating is used in many industries to tailor the bulk solid characteristics of cohesive powders. Within this paper, the state of the art of dry coating of feedstock materials for powder based additive manufacturing (AM) processes will be reviewed. The focus is on feedstock materials for powder bed fusion AM processes, such as powder bed fusion of polymers with a laser beam and powder bed fusion of metals with lasers or an electron beam. Powders of several microns to several ten microns in size are used and the feedstock’s bulk solid properties, especially the flowability and packing density are of immanent importance in different process steps in particular for powder dosing and spreading of powder layers onto the building area. All these properties can be tuned by dry particle coating. Moreover, possibilities to improve AM processability and to manipulate the resulting microstructure (c.f. grain refinement, dispersion strengthening) by adhering nanoparticles on the powders will be discussed. The effect of dry coating on the obtained powder properties along the whole AM process chain and the resulting part properties is assessed. Moreover, appropriate characterization methods for bulk solid properties of dry-coated AM powders are critically discussed.

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Section: Nickel Alloy Feedstock Powdersmentioning

confidence: 99%

Dry powder coating in additive manufacturing

Schmidt

Peukert

2022

Front. Chem. Eng.

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“…One of the most widespread metal AM process is selective laser melting (SLM) or direct metal laser sintering (DMLS) [7,8]. In this process, a high-density object is built up layer by layer through the consolidation of metal powder particles with a focused laser beam that selectively scans the surface of the powder bed [3,[9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Defect Probability Estimation for Hardness-Optimised Parts by Selective Laser Melting

Galetto

Genta

Maculotti

et al. 2020

Int. J. Precis. Eng. Manuf.

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The development of reliable additive manufacturing (AM) technologies to process metallic materials, e.g. selective laser melting (SLM), has allowed their adoption for manufacturing final components. To date, ensuring part quality and process control for low-volume AM productions is still critical because traditional statistical techniques are often not suitable. To this aim, extensive research has been carried out on the optimisation of material properties of SLM parts to prevent defects and guarantee part quality. Amongst all material properties, defects in surface hardness are of particular concern as they may result in an inadequate tribological and wear resistance behaviour. Despite this general interest, a major void still concerns the quantification of their extent in terms of probability of defects occurring during the process, although it is optimised. Considering these issues, this paper proposes a novel approach to quantify the probability of occurrence of defects in hardness-optimised parts by SLM. First, three process variables, i.e. laser power, scan speed and hatching distance, are studied considering their effect on hardness. Design of Experiments and Response Surface Methodology are exploited to achieve hardness optimisation by controlling process variables. Then, hardness defect probability is estimated by composing the uncertainty affecting both process variables and their relationship with the hardness. The overall procedure is applied to AlSi10Mg alloy, which is relevant for both aerospace and automotive applications. The approach this study proposes may be of assistance to inspection designers to effectively and efficiently set up quality inspections in early design phases of inspection planning.

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“…In recent years, researchers have used SLM technology to manufacture various MMNCs and biocomposites [4] [14]. For instance, the typically investigated nickelbased nanocomposites include TiC/Inconel 718 nanocomposites [15][16], carbon nanotube/Inconel 625 composites [17] and TiN/Inconel 718C composites [18]. The findings from these studies demonstrated that, compared to the as-fabricated matrix materials, SLM-fabricated nanocomposites exhibited higher tensile strength but lower elongation due to the ensuing grain refinement.…”

Section: Introductionmentioning

confidence: 99%

Selective laser melting of Hastelloy X nanocomposite: Effects of TiC reinforcement on crack elimination and strength improvement

Han

Huang

et al. 2020

Composites Part B: Engineering

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The Hastelloy X (HX) nickel-based superalloy is increasingly applied in the aerospace industry because of its exceptional combination of oxidation resistance and hightemperature strength. The addition of nanoscale ceramic reinforcements to the HX alloy is expected to further improve its mechanical and thermophysical performance.The research challenge is to manufacture HX nanocomposites using additive manufacturing (AM) technologies, particularly selective laser melting (SLM), which has been used successfully to produce other nanocomposites. This paper systematically studies the microstructure and tensile performance of HX-3 wt.% TiC nanocomposite fabricated via SLM and explores the effects of TiC nanoparticles on hot-cracking elimination and strength enhancement. The findings reveal that the addition of 3 wt.% TiC nanoparticles resulted in (1) an extra 73 J/mm 3 laser-energy density needed to manufacture nearly full-density nanocomposite samples and (2) intergranular microcrack elimination due to the significant increase in grain boundaries induced by the grain refinement. The results showed a 17% increase in yield strength, while the elongation to failure was not significantly reduced. The results from the microstructure examination suggest that the strengthening mechanisms of load bearing and enhanced-dislocation density were the most pronounced mechanisms in the SLMfabricated nanocomposite. These findings offer a promising pathway to strengthen mechanical performance by addressing the hot-cracking issue in the AM of nickelbased superalloys that suffer from cracking susceptibility. The results can also help to accelerate the uptake of AM in high-performance and defect-free superalloys for various applications.

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Effects of heat treatment on microstructures and tensile properties of IN718/TiC nanocomposite fabricated by selective laser melting

Abstract: Effects of heat treatment on microstructures and tensile properties of IN718/TiC nanocomposite fabricated by selective laser melting

Cited by 67 publications

References 37 publications

Dry powder coating in additive manufacturing

Dry powder coating in additive manufacturing

Defect Probability Estimation for Hardness-Optimised Parts by Selective Laser Melting

Selective laser melting of Hastelloy X nanocomposite: Effects of TiC reinforcement on crack elimination and strength improvement

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