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Thermal Stability of GH4065A Superalloy Based on Microstructural and Performance Evolution Following Long-Term Aging

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Abstract

This study investigates the thermal stability of a GH4065A superalloy at intermediate temperatures by conducting long-term aging treatments for 100–6000 h at 700–800 °C. Secondary γ′-phase coarsening and intergranular M6C carbide precipitation occurred during aging. The activation energy for secondary γ′-phase coarsening was 259.89 ± 25.45 kJ mol−1, suggesting that this process was predominantly controlled by elemental diffusion. The tensile strength at a testing temperature of 700 °C was stably above 1200 MPa for the alloys aged at 700 °C but continuously declined as the aging temperature increased, with a direct correlation identified between the secondary γ′-phase coarsening and strength reduction upon aging. Increasing the aging temperature transitioned the deformation mechanism from Orowan bowing around the γ′ phase to dislocation slip through the broadened matrix channels, leading to decreased strength. Long-term aging effectively eliminated intermediate-temperature intergranular brittle fracture. The elongation to failure at a testing temperature of 700 °C increased by approximately 35% after aging at 800 °C for 6000 h, attributed to grain-boundary diffusion of W and Mo and intragranular softening, which improved the deformation coordination ability at the grain boundaries. Finally, the precipitation of intergranular M6C particles after prolonged aging promoted plastic deformation via micropore aggregation.

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Acknowledgements

This work was supported by the National Key R&D Program of China (Nos. 2019YFA0705300 and 2017YFA0700703), the IMR Innovation Fund (No. 2021-PY09), the National Science and Technology Major Project of China (No. 2019-VI-0006-0120), and the Doctoral Start-up Foundation of Liaoning Province (No. 2020-BS-007).

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Authors and Affiliations

  1. Shi-Changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Yingbo Bai, Rui Zhang, Chuanyong Cui, Yizhou Zhou & Xiaofeng Sun

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

    Yingbo Bai

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Bai, Y., Zhang, R., Cui, C. et al. Thermal Stability of GH4065A Superalloy Based on Microstructural and Performance Evolution Following Long-Term Aging. Met. Mater. Int. 30, 333–347 (2024). https://doi.org/10.1007/s12540-023-01510-x

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