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Orientational growth behavior and mechanism of delta (δ) phase precipitation in cold-rolled Inconel 718 alloy during heat treatment

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Abstract

Due to the important role of δ phase’s quantity and morphology in the mechanical and fatigue properties of Inconel 718 alloy and its components, it is necessary to renew insights into the effect of cold deformation on the δ phase precipitation, especially on the morphology evolution. Therefore, the nucleation and growth behavior of δ phase in cold-rolled Inconel 718 alloy during aging were investigated. The results show that the precipitation rate and volume fraction of δ phase increase with increasing the cold rolling reduction from 10% to 50%. The volume fraction of δ phase reaches equilibrium after 5 h, remaining at 5.98%, 6.52%, and 6.79% under different rolling reductions (10%, 30%, and 50%), respectively. The nucleation of δ phase mainly occurs on different sites (grain boundaries, new twin boundaries and old twin boundaries) under 10% rolling reduction, while δ phase mainly nucleates on the new grain boundaries of static recrystallization due to 50% rolling reduction. And the growth of δ phase undergoes a process of alternate orientation growth from spherical (nucleation) → short rod (longitudinal orientation growth) → short rod (radial orientation growth) → dynamic equilibrium. Under 10% rolling reduction, δ phase tends to grow into the matrix, while under 50% rolling reduction, the orientation grows faster and is easily affected by the grain boundary curvature.

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Acknowledgements

The authors are grateful to the Province Natural Science Foundation of Zhejiang (Grant No. LQ19E050004) for financial support. The authors also graciously thank China Airlines Shenyang Liming Aeroengine Co., Ltd. for aiding in providing the experimental Inconel 718 alloys.

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Authors and Affiliations

  1. School of Materials Science & Engineering, Taizhou University, Taizhou, 318000, Zhejiang, China

    Neng-yong Ye, Guang-liang Zhang, Tian-yue Huang & Lei Wang

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

    Ming Cheng & Shi-hong Zhang

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  1. Neng-yong Ye
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  2. Guang-liang Zhang
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Correspondence to Neng-yong Ye.

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Ye, Ny., Zhang, Gl., Huang, Ty. et al. Orientational growth behavior and mechanism of delta (δ) phase precipitation in cold-rolled Inconel 718 alloy during heat treatment. J. Iron Steel Res. Int. 31, 264–274 (2024). https://doi.org/10.1007/s42243-023-00955-z

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  • DOI: https://doi.org/10.1007/s42243-023-00955-z

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