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Influence of Heat Process on Microstructure and Mechanical Properties of DD5 Single Crystal Superalloy During Manufacturing

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Abstract

Different heat treatment processes, such as welding and coating, involved in the manufacturing process of DD5 single crystal high-temperature alloy parts were studied through heat process simulation experiments to investigate their potential effects on material structure and mechanical properties. The results showed that after undergoing standard heat treatment, the γ′ phase of DD5 alloy decreased in cubic degree and slightly increased in size. The interface between the matrix γ phase and the reinforcing phase γ′ became non-straight and had a slightly serrated shape. Further coating processes led to further increases in the size of the γ′ phase, and some γ′ phases showed obvious connectivity. The serrated shape morphology of the interface between the γ phase and the γ′ phase disappeared. The influence of welding and coating processes on the tensile properties at high temperatures of 870 °C was relatively small, while the effects on the long-term durability at 1093 °C were significant, with reductions of approximately 17.5% and 33.2% compared to standard heat treatment, respectively. When the heat processes of welding and coating were incorporated into the standard heat treatment process, the size of the γ′ phase also increased, and the cubic degree of the γ′ phase decreased. The interface between the matrix and the reinforcing phase also showed some degree of roughening. The tensile strength of the treated DD5 alloy at 870 °C did not change significantly, while the tensile plasticity slightly increased. The long-term durability at 1093 °C decreased by approximately 40.1% compared to standard heat treatment. The influence of heat processes on the microstructure of DD5 alloy parts during the manufacturing process was analyzed, and the corresponding relationship between the changes in microstructure and phase morphology and high-temperature performance was discussed.

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Acknowledgments

This work was supported by the Open Fund of Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process of Shenyang Aerospace University under grant NO. 120222011.

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Authors and Affiliations

  1. Shenyang Aerospace University, Shenyang, 110036, Liaoning, China

    Shujuan Ma, Xuezhi Wang & Xin Zhuang

  2. Tianmu Shan Laboratory, Hangzhou, 311100, Zhejiang, China

    Lei Cao

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  1. Shujuan Ma
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  2. Lei Cao
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  4. Xin Zhuang
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Correspondence to Lei Cao.

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Ma, S., Cao, L., Wang, X. et al. Influence of Heat Process on Microstructure and Mechanical Properties of DD5 Single Crystal Superalloy During Manufacturing. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09450-2

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  • DOI: https://doi.org/10.1007/s11665-024-09450-2

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