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Deformation characteristics of isothermally forged UDIMET 720 nickel-base superalloy

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Abstract

The hot deformation behavior of nickel-base superalloy UDIMET 720 in solution-treated conditions, simulating the forging process of the alloy, was studied using hot compression experiments. Specimens were deformed in the temperature range of 1000 °C to 1175 °C with strain rates of 10−3 to 1 s−1 and total strain of 0.8. Below 1100 °C, all specimens showed flow localization as shear band through the diagonal direction, with more severity at higher strain rates. A uniform deformation was observed when testing between 1100 °C and 1150 °C with dynamic recrystallization as the major flow softening mechanism above 1125 °C. Deformation above γ′ solvus temperature was accompanied with grain boundary separation. The hot working window was determined to be in the interval 1100 °C to 1150 °C. Thermomechanical behavior of the material was modeled using the power-law, the Sellars-Tegart, and an empirical equation. The flow stress values showed a nonlinear dependence of strain rate sensitivity to strain rate. The analysis indicated that the empirical method provides a better constitutive equation for process modeling of this alloy. The apparent activation energy for deformation was calculated and its variations with strain rate and temperature are discussed.

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Authors and Affiliations

  1. the Department of Materials Engineering, Tarbiat Modares University, Tehran, Iran

    H. Monajati (Postdoctoral Student)

  2. the Department of Metallurgy and Materials Engineering, Sharif University of Technology, Tehran, Iran

    A. K. Taheri (Professor)

  3. the Aerospace Manufacturing Technology Center, Institute for Aerospace Research National Research Council Canada, H3T 2B2, Montreal, PQ, Canada

    M. Jahazi (Senior Research Officer and Program Manager)

  4. the Department of Metals and Materials Engineering, McGill University, Montreal, PA, Canada

    S. Yue (Professor)

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  1. H. Monajati
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  4. S. Yue
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Monajati, H., Taheri, A.K., Jahazi, M. et al. Deformation characteristics of isothermally forged UDIMET 720 nickel-base superalloy. Metall Mater Trans A 36, 895–905 (2005). https://doi.org/10.1007/s11661-005-0284-z

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  • DOI: https://doi.org/10.1007/s11661-005-0284-z

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