Microstructure and mechanical properties of a novel polycrystalline rhenium-containing nickel-based disc superalloy subjected to hot forging

Open School-Conference of NIS Countries Ultrafine Grained and Nanostructured Materials

Mukhtarov, S.K.^1 ; Shakhov, R.V.^1 ; Ganeev, A.A.^1 ; Gaisin, R.A.^1 ; Logunov, A.V.^2 ; Imayev, V.M.^1 ; Imayev, R.M.^1

Institute for Metals Superplasticity Problems, Russian Academy of Sciences, 39 Khalturin st, Ufa

450001, Russia^1

PJSC UEC-Saturn, 163 Lenin Ave, Rybinsk

152903, Russia^2

关键词: Heterogenization;    High-temperature capability;    Microstructure and mechanical properties;    Polycrystalline;    Polycrystalline nickels;    Quasi-isothermal;    Recrystallized microstructures;    Solvus temperature;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/447/1/012055/pdf
DOI  :  10.1088/1757-899X/447/1/012055

来源: IOP

【 摘 要 】

A newly developed heavy alloyed polycrystalline nickel-based superalloy SDZhS-15 containing rhenium and intended as a structural material for turbine discs in gas turbine engines has been studied. Multiple homogenization and heterogenization heat treatment was developed for the superalloy to improve its hot workability. The heat treated workpieces were subjected to single-step hot forging under quasi-isothermal conditions at temperatures slightly below the γ′ solvus temperature followed by air cooling and ageing. As a result, sound forgings with an inhomogeneous, partially recrystallized microstructure were produced. The obtained forgings were used for preparation of specimens for mechanical testing. The new superalloy showed superior high strength and high temperature capability, while retaining reasonable ductility in comparison with currently known disc superalloys.