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Effect of Thermomechanical Treatment on the Formation of Gradient Structure and Mechanical Properties in a Disk Made of Powder-Metallurgy Nickel-Based Superalloy

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Abstract

The process of obtaining a gradient structure by thermomechanical treatment (TMT) has been demonstrated using the example of a model disk workpiece made of the powder-metallurgy (PM) EP741NP nickel-based superalloy. The TMT included the main deformation leading to the development of recrystallization and the formation of a fine-grained microstructure, heat treatment in a gradient temperature field, additional deformation, and final strengthening heat treatment. In the disk workpiece after TMT, a gradient structure was obtained: a “necklace” structure in the peripheral part and a fine-grained “microduplex” structure in the center. The estimation of mechanical properties of samples cut out at different distances from the axis of symmetry of the disk workpiece showed that the central part of the disk is characterized by enhanced strength and ductility, and the peripheral part possesses enhanced high-temperature strength and impact toughness. The obtained results indicate that the approach used is promising for achieving a gradient structure and gradient mechanical properties in disks made of PM nickel based superalloys.

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ACKNOWLEDGMENTS

The experimental studies were carried out using the equipment of the Center of Collaborative Access of the Institute for Metals Superplasticity Problems, Russian Academy of Sciences.

Funding

This work was supported by the Russian Scientific Foundation (project no. 18-19-00685).

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Authors and Affiliations

  1. Institute for Metals Superplasticity Problems, Russian Academy of Sciences, 450001, Ufa, Russia

    A. A. Ganeev, V. A. Valitov, F. Z. Utyashev & V. M. Imaev

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  1. A. A. Ganeev
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  2. V. A. Valitov
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  3. F. Z. Utyashev
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  4. V. M. Imaev
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Corresponding author

Correspondence to V. M. Imaev.

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Translated by O. Golosova

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Ganeev, A.A., Valitov, V.A., Utyashev, F.Z. et al. Effect of Thermomechanical Treatment on the Formation of Gradient Structure and Mechanical Properties in a Disk Made of Powder-Metallurgy Nickel-Based Superalloy. Phys. Metals Metallogr. 120, 410–416 (2019). https://doi.org/10.1134/S0031918X19040057

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