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The influence of Zr additions (in the form of ZrH2 particles) on themicrostructure and mechanical properties of IN718 Ni-based superalloymanufactured by selective laser melting was explored. Fully dense alloys couldbe obtained by careful selection of the processing parameters. The addition ofZrH2 did not modify the microstructure of the alloy but introduced a dispersionof Zr-rich globular particles of approximately 50 nm in diameter whichincreased the strength of the as-printed material at ambient (23C) and hightemperature (550C). Heat treatments of solubilisation followed by aging led toa fine dispersion of gamma" precipitates that controlled the strength of thealloy, which was independent of the addition of Zr. Moreover, dynamic strainageing was found in the heat treated materials when deformed at 550C. Finally,the strength of the IN718 deformed perpendicular to the building direction washigher than that along the building direction, regardless of the heat treatmentand temperature. Computational homogenization simulations showed that theanisotropy was associated with the strong texture.

Effect of ZrH2 particles on the microstructure and mechanical properties of IN718 manufactured by selective laser melting