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Dynamic recrystallization and microstructure evolution of a powder metallurgy nickel-based superalloy under hot working

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Abstract

The deformation behaviors (flow behavior, power dissipation, dynamic recrystallization, and microstructure evolution) of a typical powder metallurgy nickel-based superalloy were investigated in compression tests at temperatures range of 1020–1140 °C and strain rates range of 0.001–1.0 s−1 with the true strains of 0.3, 0.5, and 0.7, respectively. The efficiency of power dissipation can be shown by the power dissipation maps at different true strains. The results showed that true strain had a great effect on the power dissipation. Besides, the deformed microstructures were investigated. The processes of microstructure evolution at different deformation temperatures and strain rates are different. The continuous dynamic recrystallization takes place at the deformation condition of 1080 °C/0.1 s−1. The fine and uniform dynamic recrystallized grains gradually replace the pre-existing grains with the increase of true strain. The discontinuous dynamic recrystallization takes place at the deformation condition of 1110 °C/0.001 s−1. The fine dynamic recrystallized grains grow up and a part of new fine grains appear in the dynamic recrystallized grains because of the periodic dynamic recrystallization.

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ACKNOWLEDGMENTS

This work was financially supported by the national natural science foundation of China (Grant No. 51101119 and Grant No. 51175431), the postdoctoral science foundation of China (Grant No. 2015M570851), and the fundamental research funds for the central universities (Grant No. 3102016ZY012). Also, we would like to thank the funding support by the Hong Kong scholar program (Grant No. XJ2014047 and G-YZ68).

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Authors and Affiliations

  1. School of Materials Science & Engineering, Northwestern Polytechnical University, Xi’an, 710072, People’s Republic of China

    Yanhui Liu, Yongquan Ning, Zekun Yao, Yuzhi Li & Jingli Zhang

  2. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong

    Mingwang Fu

Authors
  1. Yanhui Liu
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  2. Yongquan Ning
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  3. Zekun Yao
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  4. Yuzhi Li
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  5. Jingli Zhang
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  6. Mingwang Fu
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Correspondence to Yanhui Liu.

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Liu, Y., Ning, Y., Yao, Z. et al. Dynamic recrystallization and microstructure evolution of a powder metallurgy nickel-based superalloy under hot working. Journal of Materials Research 31, 2164–2172 (2016). https://doi.org/10.1557/jmr.2016.204

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  • DOI: https://doi.org/10.1557/jmr.2016.204

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