Abstract
The purpose of this paper is to investigate the effects of TiC nanoparticle content on microstructures and tensile properties of the IN718/TiC nanocomposites fabricated by selective laser melting (SLM). 0.5wt%, 1.0wt%, and 2.0wt% of TiC nanoparticles are added to the IN718 powders. The bulk-form IN718/TiC nanocomposites with different TiC contents are fabricated in-situ by SLM using the same process settings. The evolution of microstructures and tensile properties as the effect of changing the TiC content is studied using the optical microscopy, scanning electron microscopy, X-ray diffraction analysis, and tensile testing. The increase of TiC content refines the microstructure, promotes the formation of the cellular morphology, and reduces the size and continuity of Laves precipitates. Increasing the TiC content improves the yield strength and ultimate tensile strength but decreases the ductility. The grain refinement, dislocation bowing, dislocation punching, and the reduction in Laves precipitate contribute to the strengthening effect in the IN718/TiC nanocomposites.
Highlights
Selective laser melting (SLM) is one of the “Power Bed Fusion” additive manufacturing (AM) processes for fabricating metallic parts
Microstructures Optical microscopy (OM) images taken from IN718/TiC nanocomposites with different TiC contents are shown in figure 2
The effects of the TiC content on microstructures and the tensile properties of the SLM-fabricated IN718/TiC nanocomposites were investigated, and the findings are summarized as below: 1) Fully-dense specimens in the pure IN718 and IN718/TiC nanocomposite with different TiC contents can be fabricated using the same set of SLM process parameters
Summary
Selective laser melting (SLM) is one of the “Power Bed Fusion” additive manufacturing (AM) processes for fabricating metallic parts. In the SLM process, metal powders are rapidly melted by a high-energy laser and re-solidify to form metallurgical bonding [1]. SLM has been used to fabricate bulk-form parts in many different metallic materials, including titanium [2], aluminum [3], iron [4], cobalt-chrome [5], and nickel alloys [6]. The directional solidification and the rapid cooling rate (106-7K/s) generate unique microstructures for selected laser melted metals, including highlyoriented dendrites and ultra-fine grains, which result in different (sometimes superior) mechanical properties compared with cast and wrought metals [7,8,9]. In as-built IN718 via SLM, the growth of γ'
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