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Research on the coarsening mechanism of precipitations and its effect on toughness for nickel-based weld metal during thermal aging

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Abstract

Coarsening mechanism of precipitations was investigated in a weld metal of Alloy 617 during long-term aging at 750 °C, and its effect on impact toughness was clarified distinctly. The needle-like M6C phases at the grain boundary nucleated and coarsened at 2000 h and then presented a stable size with aging to 8000 h. Spherical γ′ phase grew rapidly with the rate of 0.0121 nm/h when aged at 1000 h; then, its ripening rate (RR) reduced to 0.0033 nm/h at 8000 h and stabilized around it. The coarsening of M6C and γ′ was, respectively, controlled by interface diffusion and volume diffusion with the coarsening rate constant of 7.865 × 10−20 m2/s and 1.519 × 10−27 m3/s. Interaction of M6C and γ′ could facilitate their coarsening and cause dramatic decrease in toughness at the early stage. At aging to 8000 h and more, the lower RR of needle-like M6C phases and γ′ phases helped to form stable toughness at a later stage.

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Acknowledgments

The authors gratefully acknowledge the financial supports by the National Natural Science Foundation of China (Nos. U1660101, 51675336, and 51775338).

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Authors and Affiliations

  1. Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, People’s Republic of China

    Tongjiao Chu, Huali Xu, Haichao Cui & Fenggui Lu

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  1. Tongjiao Chu
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Correspondence to Fenggui Lu.

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Chu, T., Xu, H., Cui, H. et al. Research on the coarsening mechanism of precipitations and its effect on toughness for nickel-based weld metal during thermal aging. Journal of Materials Research 34, 2705–2713 (2019). https://doi.org/10.1557/jmr.2019.43

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