Effect of hot working on the microstructure and tensile properties of a novel PM Re-bearing nickel base superalloy

S.K. Mukhtarov, D.A. Karyagin, A.V. Logunov, A.A. Ganeev, R.I. Zainullin, R.V. Shakhov ORCID logo , V.M. Imayev show affiliations and emails
Received: 28 October 2022; Revised: 09 November 2022; Accepted: 09 November 2022
Citation: S.K. Mukhtarov, D.A. Karyagin, A.V. Logunov, A.A. Ganeev, R.I. Zainullin, R.V. Shakhov, V.M. Imayev. Effect of hot working on the microstructure and tensile properties of a novel PM Re-bearing nickel base superalloy. Lett. Mater., 2022, 12(4s) 457-462
BibTex   https://doi.org/10.22226/2410-3535-2022-4-457-462


Microstructure of HIP superalloy and after subsequent hot deformation.The work is devoted to study of an experimental PM nickel-based superalloy Ni-16(Al, Ti, Nb, Ta)-30(Cr, Co, Mo, Hf, W, Re) (wt.%). The initial as-HIP’ed material was prepared as cylinders with a size of ∅100 × 200 mm. The hot workability of the superalloy was evaluated by compression tests of small samples under isothermal conditions. The tests were performed at temperatures of 1150 –1240°C with a strain rate of έ =10−4 –10−1 s−1. Some samples were subjected to preliminary homogenization annealing. Examination of the deformed samples by SEM made it possible to define the hot working conditions providing development of recrystallization processes and formation of a uniform fine-grained structure. It was established that preliminary homogenization of as-HIP’ed material followed by fractional forging with intermediate recrystallization annealings in the temperature range of (Ts− 40) – (Ts−15), where Ts is the γ' solvus temperature, provided a uniform development of recrystallization. The obtained forgings were subjected to ageing or solid solution treatment and ageing. In the fine-grained condition obtained by hot working and heat treatment, the material exhibited tensile properties comparable to the best properties achievable in disc nickel-based superalloys.

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