Abstract
Implementing the latest additive technologies such as selective laser melting (SLM) and electron-beam melting (EBM), as well as direct metal laser sintering (DMLS) requires source materials (powders, or microgranules) of a specified chemical or granulometric composition. This paper describes a brand new technological process of obtaining composite microgranules that consists of three main stages: (1) synthesizing a NiAl-based intermetallic alloy of a specified chemical composition by centrifugal SHS metallurgy, (2) single-stage metallurgic processing (vacuum induction melting or inert-medium melting) of synthesized SHS materials (cast-charge materials, CCM) to be subsequently cast in a specially prepared steel tube for crystallizing; (3) centrifugal atomization (PREP) of the obtained steel-shell electrodes to make spherical composite microgranules. A NiAl-Cr-Co-Hf nickel-aluminide-based multi-component cast alloy was synthesized by that technology. We obtained the kinematic-viscosity dependency for this SHS alloy. Series of studies was conducted to optimize the vacuum-induction melting, and the melt was cast in a specially prepared steel crystallizer. We thus melted a double-layer electrode for plasma-rotating electrode process. The electrode was atomized to produce spherical microgranules and to study their morphology.
Published Version
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