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The Precipitation Behavior and Hot Deformation Characteristics of Electron Beam Smelted Inconel 740 Superalloy

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Abstract

The Inconel 740 superalloy was prepared by the electron beam smelting (EBS) technology, the precipitation behavior and strengthening mechanism were studied, and the hot deformation characteristics of EBS 740 superalloy were investigated. The results indicate that the EBS 740 superalloy is mainly strengthened by the mechanism of weakly coupled dislocation shearing, and the resulting critical shear stress is calculated to be 234.6 MPa. The deformation parameters show a great influence on the flow behavior of EBS 740 superalloy. The strain rate sensitivity exponent increases with the increasing of deformation temperature, and the strain hardening exponent shows a decreasing trend with the increasing of strain. The activation energy of EBS 740 above 800 °C is measured to be 408.43 kJ/mol, which is higher than the 740H superalloy. A hyperbolic-sine-type relationship can be observed between the peak stress and Zener–Hollomon parameter. Nevertheless, the influence of deformation parameters is found to be considerably different at temperatures below and above 800 °C. The size of dynamic recrystallization (DRX) grains decreases with the increasing of strain rate when the strain rate is lower than 1/s, and reverse law can be found at higher strain rate. As a result, a piecewise function is established between the DRX grain size and hot working parameters.

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Acknowledgments

The authors gratefully acknowledge financial support from the Specialized Research Fund for the National Key Research and Development Plan (Grant No. 2017YFA0403804).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian, 116023, China

    Xiaogang You, Yi Tan, Qifan You, Longhai Zhao & Jiayan Li

  2. Laboratory for New Energy Material Energetic Beam Metallurgical Equipment Engineering of Liaoning Province, Dalian, 116024, China

    Xiaogang You, Yi Tan, Qifan You, Longhai Zhao & Jiayan Li

  3. Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1, Ookayama, Meguro-ku, Tokyo, 152-8552, Japan

    Xiaogang You

  4. Institute for Superconducting and Electronic Materials, University of Wollongong, Wollongong, 2500, Australia

    Chang Wu

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  1. Xiaogang You
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Correspondence to Yi Tan.

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You, X., Tan, Y., Wu, C. et al. The Precipitation Behavior and Hot Deformation Characteristics of Electron Beam Smelted Inconel 740 Superalloy. J. of Materi Eng and Perform 27, 1580–1591 (2018). https://doi.org/10.1007/s11665-018-3193-1

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  • DOI: https://doi.org/10.1007/s11665-018-3193-1

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