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Microstructural evolution in laser-deposited multilayer Ti-6Al-4V builds: Part I. Microstructural characterization

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Abstract

The macro and microstructure of laser-deposited Ti-6Al-4V has been investigated to determine the evolution of unique microstructural features in mutilayer builds. The macro and microstructures exhibited in the build include large, columnar prior-beta grains, a gradient in the individual alpha-lath thickness between the deposited layers, and the presence of layer bands within each layer, except for the last three layers deposited. The layer band consists of a colony Widmanstätten alpha morphology, while the nominal microstructure between layer bands exhibits a basketweave morphology. Optical microscopy, hardness, and composition measurements were used to determine that the layer-band and gradient morphologies are resultant from the complex thermal history the build experiences and not a result of segregation or oxidation. The gradient alpha and layer-band morphologies form in layer n after the deposition of layer n+3.

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Authors and Affiliations

  1. the Materials Science and Engineering Department, Virginia Tech, 24061-0237, Blacksburg, VA

    S. M. Kelly (Graduate Research Assistant) & S. L. Kampe (Associate Professor)

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  1. S. M. Kelly
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  2. S. L. Kampe
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Kelly, S.M., Kampe, S.L. Microstructural evolution in laser-deposited multilayer Ti-6Al-4V builds: Part I. Microstructural characterization. Metall Mater Trans A 35, 1861–1867 (2004). https://doi.org/10.1007/s11661-004-0094-8

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  • DOI: https://doi.org/10.1007/s11661-004-0094-8

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