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Improved Tensile Properties of Micro-grain Casting K447A Alloy

  • Topical Collection: Processing and Applications of Superalloys
  • Published:
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Abstract

Micro-grain K447A superalloy with grain refined to 54 μm and yield strength up to 1022 MPa has been successfully fabricated in this work, whose strength is 200 MPa higher than that of conventional casting K447A. Owing to the bimodal distribution of γ′, two dislocation mechanisms act simultaneously at the initial stage of plastic deformation. That is, dislocations cut γ′ with radius less than 100 nm but bypass γ′ over 100 nm. Based on the deformation mechanisms of γ′ with different sizes, a frequency-weighted precipitation strengthening calculation method has been proposed to predict the contribution of precipitation strengthening accurately. Yield strength predicted by this method is in good agreement with experimental results with maximum error of 4.0 pct. Strength calculation indicates that micro-grain casting process improves the yield strength mainly by increasing the volume fraction of γ′ from 34.2 to 51.6 pct and reducing the grain size from 5 mm to 54 μm, compared with the conventional one.

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Acknowledgments

The authors would like to acknowledge the financial support by Advanced High Temperature Structural Materials Laboratory in Beijing Institute of Aeronautical Materials.

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Authors and Affiliations

  1. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, P.R. China

    Yue Wang, Xitao Wang, Rui Liu & Jinshan He

  2. Shandong Provincial Key Laboratory for High Strength Lightweight Metallic Materials, Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Science), Jinan, 250353, P.R. China

    Xitao Wang

  3. Science and Technology On Advanced High Temperature Structural Materials Laboratory, AECC Beijing Institute of Aeronautical Materials, Beijing, 100095, P.R. China

    Pinpin Hu & Chengbo Xiao

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  1. Yue Wang
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Wang, Y., Wang, X., Liu, R. et al. Improved Tensile Properties of Micro-grain Casting K447A Alloy. Metall Mater Trans A 54, 1710–1720 (2023). https://doi.org/10.1007/s11661-022-06894-w

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  • DOI: https://doi.org/10.1007/s11661-022-06894-w

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