Browsing by Subject "Georgia Institute of Technology"

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    Experimental and Theoretical Analysis of Scanning Laser Epitaxy Applied to Nickel-Based Superalloys
    (University of Texas at Austin, 2011) Bansal, R.; Acharya, R.; Gambone, J.J.; Das, S.
    This paper reports on the experimental development and the theoretical analysis of the scanning laser epitaxy (SLE) process that is currently being investigated and developed at the Georgia Institute of Technology. SLE is a laser-based manufacturing process for deposition of equiaxed, directionally solidified and single-crystal nickel superalloys onto superalloy substrates through the selective melting and re-solidification of superalloy powders. The thermal modeling of the system, done in a commercial CFD software package, simulates a heat source moving over a powder bed and considers the approximate change in the property values for consolidating CMSX-4 nickel superalloy powder. The theoretical melt depth is obtained from the melting temperature criteria and the resulting plots are presented alongside matching experimental micrographs obtained through cross-sectional metallography. The influence of the processing parameters on the microstructural evolution, as evidenced through observations made from the micrographs, is discussed.
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    An Investigation of the Material Properties of Laser Sintered Parts Incorporating Conformal Lattice Structures (CLS™) Technology
    (University of Texas at Austin, 2013) Cooke, A.L.; Folgar, C.E.; Folgar, L.N.; Williams, J.; Park, S.; Rosen, D.W.
    Cellular materials, including foams, honeycombs, lattices, and similar constructions, offer the key advantages of high strength-to-weight ratios and favorable energy absorption characteristics. The concept of designed cellular materials enables customized material placement to best suit the demands of specific applications or achieve particular performance targets. The design, generation, and fabrication of conformal lattice structures via laser sintering are at the center of the disruptive manufacturing technologies proposed by 3D Systems Corporation. The primary work reported here is the maturation and mechanical testing of the conformal lattice structure technology developed between 3D Systems Corporation and the Georgia Institute of Technology.