University of Cambridge
Previous studies have shown that judicious selection of deposition parameters allows microstructural control to be achieved during the laser-blown-powder directed-energy-deposition (LBP-DED) of IN718. In this work it is shown that a Brass texture ({110} <211>) can be obtained in LBP-DED IN718. This texture is observed to be enhanced through recrystallisation following selected heat treatments. The increase in microstructural texture following recrystallisation was observed to give rise to a decrease in elastic anisotropy. This is hypothesised to be a result of the pronounced Brass texture leading to pseudo-isotropic elastic properties along the cubic axes. To further control the crystallographic texture, the addition of NbC inoculant particles to the precursor powder was investigated. It was observed that the inoculants enhanced the formation of the Brass texture component {110} <211>, as well as leading to the occurrence of alternating regions possessing mirror symmetry. The addition of the inoculant therefore offers a method of achieving a degree of microstructural and textural control during LBP-DED of IN718
Abstract
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Poster
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