TC-Toolbox for MATLAB® with Thermo-Calc Used to Optimise a Nickel-based Superalloy

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In a 2015 issue of Metallurgical and Materials Transactions A a group at Michigan University, Department of Materials Science & Engineering used TC-Toolbox for MATLAB® in conjunction with Thermo-Calc to optimise a nickel-based alloy, resulting in a lower cost alloy with 25% improvement in properties when assessed with their utility function.

The paper describes how thermodynamic modelling and design-of-experiments techniques were used to identify three modifications that could be made to the nickel-based superalloy Nimonic® 263 with the aim of improving creep strength above 1023 K (750 °C).

The paper, Design of an Eta-Phase Precipitation-Hardenable Nickel-Based Alloy with the Potential for Improved Creep Strength Above 1023 K (750 °C), was written by Matthew J. Wong, Paul G. Sanders, John P. Shingledecker and Calvin L. White.

Abstract:

In a number of nickel-based superalloy systems strengthened by gamma prime (γ′), eta-phase (Ni3Ti, η) forms during prolonged high-temperature exposure, but its effect on mechanical properties is not well characterized. Using thermodynamic modeling and design-of-experiments techniques, three modifications of the nickel-based superalloy Nimonic (Nimonic® is a trademark of Special Metals Corporation group of companies.) 263 were identified that yield increased volume fractions of the eta-phase (Ni3Ti, η) at temperatures above 1023 K (750 °C). Volume fractions of η-phase were evaluated for each alloy and heat-treatment condition using optical microscopy, scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. Compared to Nimonic 263, small additions of V and Ta were found to increase the volume fraction of η-phase above 1023 K (750 °C) from approximately 5 pct to above 15 pct, thus providing a route for future mechanical behavior experimental studies, which was not in the scope of this work.

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