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Influence of the Preheat Temperature and Withdrawal Rate on the Microstructure of Ceramic-Cored Ds MAR-M247 Nickel-Based Superalloy

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Abstract:

The research focuses on cored blades made from the MAR-M247® Ni-based superalloy, which were manufactured through directional solidification with varying withdrawal rates of either 3.4 mm/min or 5.0 mm/min, and shell mold temperatures of 1510 °C or 1566 °C after undergoing solution heat treatment. The characterization of four variants of the cored blades was conducted using several analytical techniques: X-ray diffraction (XRD), light microscopy (LM), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). The XRD analysis identified the presence of the γ matrix, the intermetallic γ' phase, MC carbides, and M5B3 phases. The dendritic regions of the cored blades consist of secondary γ' precipitates surrounded by a γ matrix, with a mean size ranging from 0.264 to 0.272 μm, depending on the fabrication parameters.

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Info:

Periodical:

Materials Science Forum (Volume 1181)

Pages:

19-24

DOI:

https://doi.org/10.4028/p-DMoMa9

Citation:

Cite this paper

Online since:

March 2026

Authors:

Rafał Cygan*, Konrad Wysocki, Łukasz Rakoczy

Keywords:

Aerospace, Investment Casting, MAR-M247, Superalloys

Funder:

The publication of this article was funded by the AGH University of Krakow 10.13039/501100007751

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Creative Commons CC BY 4.0

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* - Corresponding Author

References

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