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Liquid Phase Sintering of a Metal Injection Molded Nickel-Based Superalloy With Additions of BNi-2 Alloy Powder Using Differential Scanning Calorimetry

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Abstract

Metal injection molded (MIM) nickel superalloys (NiSAs) exhibit fine-grain microstructures which have limited creep resistance. By increasing the grain size of these MIM alloys, it is possible to advance the use of MIM technology in the high temperature sections of aero engines. In the present work, the ability to achieve grain growth in a MIM NiSA during liquid phase sintering (LPS) is evaluated using differential scanning calorimetry (DSC). A commercial brazing filler metal (BNi-2) was added to the MIM NiSA as liquid phase sintering additive in 5 and 10 wt pct loadings. A comparative DSC analysis technique was employed to quantify the LPS liquid fraction with time and temperature. The grain size of the MIM NiSA during LPS was determined from optical microscopy of interrupted test samples. DSC coupled with SEM-EDS analysis revealed that the NiSA and BNi-2 alloys create a diffusionally solidified product during heating which melts above 1200 °C. The liquid fraction was constant with time at temperature in the 5 wt pct BNi-2 loading, but increased during isothermal hold time in the 10 wt pct loading. Grain growth was successfully achieved in the 10 wt pct BNi-2 loading at the expense of alloy homogeneity.

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Acknowledgments

The authors would like to acknowledge the financial support received from the Natural Sciences and Engineering Research Council of Canada (NSERC) and Pratt and Whitney Canada (P&WC). Special thanks is given to Thomas Georges, Josianne Coulombe, and Orlando Scalzo for provision of materials for this research and useful technical discussions.

Funding

This study was funded by the Government of Canada under the Natural Sciences and Engineering Council and Pratt and Whitney Canada under the Industrial Research Chair program.

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  1. Dalhousie University, 1360 Barrington Street, Halifax, NS, B3H 4R2, Canada

    Addison J. Rayner & Stephen F. Corbin

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  1. Addison J. Rayner
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  2. Stephen F. Corbin
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Correspondence to Addison J. Rayner.

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The research described in this paper was partially funded by Pratt and Whitney Canada (P&WC). The work was carried out with guidance and communication with P&WC personnel.

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Rayner, A.J., Corbin, S.F. Liquid Phase Sintering of a Metal Injection Molded Nickel-Based Superalloy With Additions of BNi-2 Alloy Powder Using Differential Scanning Calorimetry. Metall Mater Trans A 54, 4688–4700 (2023). https://doi.org/10.1007/s11661-023-07191-w

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