Abstract
The properties of the nickel based superalloys, in particular 718 nickel-based alloy, are mainly improved by the hardening mechanism, which is based on precipitation of second phases. This work aimed to compare the evolution of precipitation hardening in a 718 alloy microstructure for two different solubilization conditions: 1050 ℃ for 2 h and 970 ℃ for 2 h, followed by a period up to 120 h of aging at 800 ℃ and correlated to the values of hardness. The microstructure was analyzed by optical microscopy . Vickers hardness test was performed and the grain size was measured. It was verified an increase on the hardeness of this material up to 15 h of aging, after that the value decreased to a level that is maintained until 120 h for both solubilization conditions.
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Acknowledgements
The authors thank the support to this investigation by the Brazilian agencies: CNPq. FAPERJ and CAPES.
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da Costa Garcia Filho, F., de Oliveira, D.S., Monteiro, S.N. (2018). Influence of Two Solubilization Conditions at 718 Superalloy Hardness and Microstructure. In: Li, B., et al. Characterization of Minerals, Metals, and Materials 2018 . TMS 2018. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-72484-3_61
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DOI: https://doi.org/10.1007/978-3-319-72484-3_61
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