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Hot Deformation Behavior of GH738 for A-USC Turbine Blades

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Abstract

The hot deformation characteristics of GH738 superalloy over the temperature range of 1000 °C to 1200 °C and strain range of 0.01 s−1 to 10.0 s−1 under a strain of 1.0 s−1 were investigated through hot compression tests with a Gleeble-1500 simulation machine. The flow stress reached peak value before flow softening occurred. The average apparent activation energy (Q) of GH738 was calculated to be 430 kJ/mol, and the stress index (n) is approximately 4.08. The processing map was developed based on flow stress data and dynamic materials model (DMM). The map shows a dynamic recrystallization (DRX) domain in 1050 °C to 1150 °C and 0.01 s−1 to 1.0 s−1 strain rate range with a peak efficiency of 45%, which is considered to be the optimum region for hot working. Moreover, the materials undergo flow instability in the temperature range of 1000 °C to 1050 °C and strain range of 1.0 s−1 to 10.0 s−1, and adiabatic shear bands can be observed in this domain.

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Authors and Affiliations

  1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, 650093, Kunming, Yunnan, China

    Li Wang (Doctor Candidate) & Shu-biao Yin (Associate Professor)

  2. Central Iron and Steel Research Institute, 100081, Beijing, China

    Li Wang (Doctor Candidate), Gang Yang & Lu Wang

  3. Kunming Metallurgy College, 650033, Kunming, Yunnan, China

    Ting Lei

Authors
  1. Li Wang
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  2. Gang Yang
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  3. Ting Lei
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  4. Shu-biao Yin
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  5. Lu Wang
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Corresponding authors

Correspondence to Li Wang or Shu-biao Yin.

Additional information

Foundation Item: Item Sponsored by National High Technology Research and Development Program (863 Program) of China (2012AA03A502)

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Wang, L., Yang, G., Lei, T. et al. Hot Deformation Behavior of GH738 for A-USC Turbine Blades. J. Iron Steel Res. Int. 22, 1043–1048 (2015). https://doi.org/10.1016/S1006-706X(15)30110-2

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  • DOI: https://doi.org/10.1016/S1006-706X(15)30110-2

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