Superplastic forming of EK61 nickel-based superalloy with ultrafine-grained structure

R.V. Safiullin, V.A. Valitov, R.Y. Lutfullin, E.V. Galieva, E.Y. Klassman show affiliations and emails
Received 16 September 2022; Accepted 06 November 2022;
Citation: R.V. Safiullin, V.A. Valitov, R.Y. Lutfullin, E.V. Galieva, E.Y. Klassman. Superplastic forming of EK61 nickel-based superalloy with ultrafine-grained structure. Lett. Mater., 2022, 12(4s) 439-444
BibTex   https://doi.org/10.22226/2410-3535-2022-4-439-444

Abstract

The process of superplastic forming into a cylindrical matrix of workpieces from the EK61 superalloy with an ultrafine-grained structure has been studied.The formation of an ultrafine-grained structure in the heat-resistant nickel-based EK61 superalloy makes it possible to realize the effect of low-temperature superplasticity. This is important for the development of resource-saving technologies for forming hollow products of complex configuration. The study of mechanical properties of the nickel-based EK61 superalloy with ultrafine-grained structure under conditions of uniaxial tension and compression at temperatures of 650 – 850°C and strain rates of 10−3 – 10−4 s−1 was carried out. The process of superplastic forming (SPF) under conditions of low-temperature superplasticity of ultrafine-grained sheet blanks from the EK61 superalloy using cylindrical matrix has been studied. It was found that after SPF, a homogeneous equiaxed ultrafine-grained duplex structure is preserved in the samples.

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Funding

1. State assignment of the IMSP RAS - 122011900470-7
2. State assignment of the IMSP RAS - 122011900474-5