Abstract
Phase composition, microstructure, tensile properties and fracture mechanism of the high-nickel austenitic steel produced by a dual wire-feed electron beam additive manufacturing were studied. The joint using of NiCr-alloy and 321-type stainless steel wires in additive manufacturing process assists the formation a fully austenitic structure in as-built billet. Its microstructure is stable against deformation-induced γ → α’ martensitic transformation due to the 5–7 wt.% increase of nickel concentration relative to the initial steel wire composition. The high-nickel steel possesses high ductility (δ ≈ 54%) and plastic flow behavior similar to the conventional cast 321-type steel subjected to a solid-solution treatment.
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