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Solidification and Evolution of β-NiAl Phase in a Re-Containing Single Crystal Superalloy

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Abstract

The β-NiAl phase, which may exacerbate the high-temperature mechanical properties of Ni-based superalloy, was observed in a designed Re-containing single crystal superalloy. The solidification mechanism of β-NiAl phase and its evolution after solution treatment as well as long-term aging at 1120 °C were systematically investigated. The β-NiAl phase was confirmed by the analyses of XRD and TEM in as-cast specimen. Combined the analyses of TEM, DSC, phase diagrams and chemical segregation behaviors obtained via EPMA, the solidification path in interdendritic region was determined as L → (β-NiAl + Cr) eutectic, L → β + δ, L + β → γ′, L → γ′. The β-NiAl phase could be diminished by solution treatment and/or long-term aging treatment. After the solution treatment at 1330 °C for 30 min, the β-NiAl phase split into small bulks and the δ phase dissolved, contributing to the formation of the γ + γ′ structure and large blocky δ phase. During the long-term aging at the 1120 °C, the β-NiAl phase transformed into γ and γ′ phase. With aging time prolonging, the Cr-rich phase dissolved, which promoted the precipitation of TCP confirmed as μ phase with three morphologies.

Graphical Abstract

After solution treatment at high temperature for 30 min, β-NiAl phase dissolved and reprecipitated into small bunks surrounded with filmier γ′phase, and γ + γ′microstructures as well as large δ phase were formed via the chemical diffusion and redistribution at high temperature. After long-term aging at 1120 °C, β-NiAl phase gradually dissolved and transformed to γ′phase and γ phase. Moreover, the precipitation of TCP phase was accelerated with aging time prolonging.

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Acknowledgements

The financial supports provided by National Key R&D Program of China under Grant No. 2017YFA0700704, National Science and Technology Major Project under Grant No. 2017-VI-0002-0072, National Natural Science Foundation of China (NSFC) under Grant No. 51671188 and Youth Innovation Promotion Association, Chinese Academy of Sciences Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences under Grant No. CXYJJ20-MS-03, for carrying out this work are gratefully acknowledged. Thanks for the help of Z.C. Zhu (Institute of Metal Research) with the experiments and writing.

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Li, Y.M., Wang, X.G., Tan, Z.H. et al. Solidification and Evolution of β-NiAl Phase in a Re-Containing Single Crystal Superalloy. Met. Mater. Int. 28, 2305–2317 (2022). https://doi.org/10.1007/s12540-021-01136-x

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