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Mechanism-Based Models for Predicting the Microstructure and Stress–Strain Response of Additively Manufactured Superalloy 718Plus

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Abstract

Alloy 718Plus, commonly known as ATI 718Plus®, is a Ni-based superalloy that has been developed to exhibit a γ + γ′ microstructure with a higher high-temperature strength capability compared to Alloy 718. In addition to wrought products, Alloy 718Plus has also been processed by additively manufacturing processes via layer-by-layer deposition. Additively manufactured (AM) 718Plus is typically heat-treated using multiple steps in order to provide an optimized microstructure and desired mechanical properties. In this article, mechanism-based heat treatment and constitutive models were developed for Alloy 718Plus. In particular, solution treatment and aging models were developed for predicting the grain size and the size, number density, and volume fraction of δ, secondary γ′, and tertiary γ′ precipitates in the microstructure. This microstructural information was then utilized in conjunction with a physics-based constitutive model, called MicroROM, to predict the stress–strain response of Alloy 718Plus. The predictive capabilities of the heat treatment models, named HTM718Plus, and the constitutive model (MicroROM) were first benchmarked against literature data of ATI 718Plus. Subsequently, the heat treatment models and constitutive model were applied to predict the microstructure and tensile response of AM 718Plus heat-treated by a multi-step procedure with good agreement between computed results and experimental data.

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Acknowledgments

This work was supported by DARPA through Contract Number HR0011-17-C-0024 (Jan Vandenbrande, Program Manager) at Southwest Research Institute (SwRI). The views, opinions, and/or findings expressed are those of the author and should not be interpreted as representing the official views or policies of the Department of Defense or the US Government. The author acknowledges the assistance by Ms. Loretta Mesa and Ms. Adriana Bosquez, both of SwRI, in the preparation of the manuscript.

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    Present address: MESI Technologies LLC, San Antonio, TX, 78250, USA

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    Kwai S. Chan

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Chan, K.S. Mechanism-Based Models for Predicting the Microstructure and Stress–Strain Response of Additively Manufactured Superalloy 718Plus. J. of Materi Eng and Perform 29, 2035–2045 (2020). https://doi.org/10.1007/s11665-020-04678-0

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