Layerwise fabrication of refractory NiCrSiB composite with gradient grow of tungsten carbide additives by selective laser melting

Igor Shishkovsky, Nina Kakovkina, Vladimir Sherbakov

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    7 Citations (Scopus)

    Abstract

    In the present paper, the selective laser melting process of multilayered 3D fabrication from metal matrix composites (MMC) based on nickel-chrome heat resistant alloy with WC ceramic reinforcing additive was implemented. The possibility of a laser powder bed fusion of functional grade (FG) 3D parts from these MMC for the account of increasing the alloying element concentration from 5% to 15%vol of the tungsten carbide in NiCrSiB self-fluxing alloy was shown. The optical and scanning electron microscopy, X-ray and EDX microanalysis, and microhardness measurements have been carried out to evaluate the structure formation features. We strongly recommend additional heating of the initially powdered mixture and/or substrate for temperature gradient reduction in the volume of the 3D part, homogenization of structure and decreasing residual stresses and propensity to delamination.

    Original languageEnglish
    Article number105723
    JournalOptics and Laser Technology
    Volume120
    DOIs
    Publication statusPublished - Dec 2019

    Keywords

    • Functional grade (FG) structures
    • Metal matrix composites (MMC)
    • Nickel-chrome self-fluxing superalloy
    • Selective laser melting (SLM)
    • Tungsten carbide ceramics

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