Satelliting has been shown to be an excellent method for rapid and low cost preparation of feedstock for metal‐based additive manufacturing. In this study, a biomedical titanium alloy Ti‐15Mo is produced by direct metal deposition (DMD) using the satelliting powder preparation method. The microstructure and mechanical properties are then explored. The microstructure in the DMD Ti‐15Mo sample consists primarily of fine equiaxed grains and near‐equiaxed grains. The cellular substructures are present at the bottom of each deposited layer while there are no obvious substructures in the upper region of each deposited layer. The formation of the morphologies of prior β grains is explained by combining the analysis of the nucleation effect of the partially un‐melted particles, while the substructure formation can be explained using the solidification and thermal cycling analysis during the DMD process. The compression test results show excellent compressive properties with a high strength of 1764 MPa and low compressive elastic modulus of 28.4 GPa.
Ti–35V–15Cr alloy has become an indispensable material in aerospace industry due to its excellent flame‐resistance properties. Herein, the block and thin‐wall Ti–35V–15Cr samples are built by laser solid forming (LSF) under the same processing parameters, and the evolution of solidification microstructure is investigated. This work focused on the effect of molten pool solidification parameters and complex thermal cycling conditions on the morphology of β grains and the substructure in the grains. The microstructure of LSF‐produced Ti–35V–15Cr block sample mainly consists of epitaxial columnar dendritic grains, whereas that of the deposited thin‐wall sample is mainly composed of near‐equiaxed grains together with subgrains formed in the near‐equiaxed grains. Such different microstructure results from extremely sensitive thermal behavior condition in LSF process. The simulated thermal behavior characteristics using finite element method illustrate that the thermal cycles during block deposition are very complex and the temperature gradient at the last solidification in block deposition is much higher than that in the deposition of thin‐wall samples, resulting in significantly different solidification microstructure between thin‐wall and block samples.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.