|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Additive Manufacturing: Building the Pathway towards Process and Material Qualification
||A-5: Computational Modeling and Experimental Validation of Melting and Solidification in Single-Crystal and Equiaxed Superalloys Processed Through Scanning Laser Epitaxy (SLE) for Additive Manufacturing
||Amrita Basak, Ranadip Acharya, Suman Das
|On-Site Speaker (Planned)
This paper focuses on simulation-based optimization and experimental validation of the scanning laser epitaxy (SLE) process, aimed at metal additive manufacturing and applied to gas turbine hot-section components made of nickel-base superalloys. SLE creates equiaxed, directionally-solidified and single-crystal structures in nickel superalloys through controlled laser melting of alloy powders onto like chemistry substrates using a fast scanning, high-power laser beam. In this paper, a transient coupled flow-thermal approach is implemented to accurately simulate the melting and solidification process in SLE. The laser movement is modeled as a Gaussian heat-source, and the thermophysical properties of the alloys are dynamically-calculated based on the transient thermal field. Simulations for different single-crystal and equiaxed superalloys are performed and the melt pool characteristics are recorded. Comparisons of the simulated melt depth against experimental results show good agreement across a range of SLE operating parameters. This work is sponsored by the ONR through grants N00014-11-1-0670 and N00014-14-1-0658.
||Planned: A print-only volume