Abstract
The recent advances in additive manufacturing (AM) have led to printing of complex structural components. The highly non-equilibrium processing conditions encountered during direct metal laser melting (DMLM) frequently lead to micro-cracking in high-temperature capable Ni-superalloys, irrespective of processing conditions, limiting their current applicability. This paper aims to develop a general criterion to assess printability of a Ni-superalloy solely based on its composition. Thirty-four Ni-superalloys spanning a wide range of alloying elements were printed, each with twenty-four process conditions, and their crack densities were measured in order to have a consistent set of experimental data for building a model. The models available in literature for predicting cracking susceptibility were evaluated against the experimental data. Finally, a hybrid model, based on physics-based quantities, was built with the most significant input features (x’s). This model correlates well with the experimental data and is applicable across a wide range of Ni-superalloy compositions.
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Acknowledgements
The authors acknowledge the additive manufacturing and materials characterization teams at GE Research for experimental builds and defect quantification, as well as Dr. Timothy Hanlon from GE Research and Dr. Debashis Kar from GE Aviation for helpful technical discussion. Funding from the additive platform of GE Research (Joseph Vinciquerra, Dr. Steve Duclos,) is gratefully acknowledged.
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Shukla, A., Sarkar, S., Durga, A., Adharapurapu, R., Dial, L., Sondhi, S.K. (2020). Computational Design of Additively Printable Nickel Superalloys. In: Tin, S., et al. Superalloys 2020. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-51834-9_104
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DOI: https://doi.org/10.1007/978-3-030-51834-9_104
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