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Spheroidization Mechanism of Lamellar δ Phase in Inconel 718 during Delta Processing

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Abstract

The morphology evolution of lamellar δ phase in Inconel 718 during Delta Processing was characterized by scanning electron microscopy, electron backscatter diffraction, and transmission electron microscopy. A spheroidization mechanism is proposed for transformation of the lamellar δ phase. The results showed that lamellar δ phase hindered the movement of dislocations, which led to a dislocation aggregation zone around the fracture location of the δ phase. Strain in the region thus increased, which promoted the occurrence of dynamic recrystallization and fracture of the lamellar δ phase. A diffusion channel for Nb atoms was simultaneously provided by the high-density dislocations, which led to dissolution and reduction in the amount of δ phase. Under the combined action of deformation, fracture, and dissolution, the lamellar δ phase gradually transformed into granular short rods and spheroids.

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Acknowledgments

This work was financially supported by the National Natural Science Foundation of China (Grant No. 51505240), Sino–Belarus Inter-Governmental Science and Technology Cooperation project (Grant No. CB02-09), and the Chinese National Key Research and Development Plan (Grant No. SQ2018YFE011170).

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Authors and Affiliations

  1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Hong-yan Gan, Ming Cheng, Hong-wu Song & Shi-hong Zhang

  2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China

    Hong-yan Gan

  3. AECC Shenyang Li Ming Aero-Engine (Group) Co., Ltd., Shenyang, 110043, China

    Zhen-xing Guo & Qing-an Tai

  4. Physical-Technical Institute of the National Academy of Sciences of Belarus, Minsk, 220141, Belarus

    Grazhina Kozhevnikova

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  1. Hong-yan Gan
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  5. Grazhina Kozhevnikova
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  7. Shi-hong Zhang
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Correspondence to Shi-hong Zhang.

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Gan, Hy., Cheng, M., Guo, Zx. et al. Spheroidization Mechanism of Lamellar δ Phase in Inconel 718 during Delta Processing. J. of Materi Eng and Perform 29, 3852–3857 (2020). https://doi.org/10.1007/s11665-020-04909-4

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  • DOI: https://doi.org/10.1007/s11665-020-04909-4

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