Paplham, Tyler and Toman, Jakub and Chmielus, Markus
(2021)
Development of a post-processing method for estimating solidification parameters from finite-element
modeling of laser remelting in directed energy deposition of
Ni-Mn-Ga magnetic shape-memory alloy single crystals.
Ingenium: Undergraduate Research at the Swanson School of Engineering, 7.
pp. 68-71.
Abstract
Directed energy deposition is a subset of laser additive manufacturing which has been suggested as a feasible method for producing single crystals of metal alloys such as Ni-Mn-Ga magnetic shape-memory alloys. However, relating the thermal parameters, specifically the solidification front growth velocity V and thermal gradient G to the operational parameters, specifically the nominal laser power and travel velocity, is challenging. Therefore, this work aimed to use finite-element analysis (FEA) to create thermal models which allow for the determination of G and V for operational parameter combinations. Comparison with experimental data allowed for association of the range of G and V with the samples that best displayed single crystal growth. It was found that a high power and medium-low travel velocity is most likely to result in single crystal growth.
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