Structural changes in alloy ÉK-61 due to cyclic deformation at elevated temperature

Polyanskiǐ, A. M.; Polyanskii, V. M.

doi:10.1007/s11041-010-9267-9

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“…Nickel-based superalloy EK61 can maintain good stability and excellent mechanical properties in the range of -253°C to 750°C. At present, EK61 superalloy is mainly used in rocket engine turbine disk [1][2][3][4][5][6]. As well known, the service conditions of the engine turbine disk are quite harsh.…”

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confidence: 99%

Correlation between Fracture Morphology and Microstructural Evolution during Long-Term Aging of EK61 Superalloy

Huang

Qin

et al. 2020

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Microstructural evolutions of EK61 superalloy during long-term aging until 1000 h at 700°C and 750°C, respectively, are studied by combination of Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM). Impact fracture morphologies after aging for different time are observed by the SEM. The microstructure is found to be relatively stable during aging at 700°C, and the fracture morphologies are characterized by transgranular fracture. At 750°C, the coarsening of γ′ phase leads the reduction of the quantity of dimples, the chainization of carbides on grain boundaries leads to intergranular fracture, and the netting of η phases within grains leads to the formation of lamellar cleavage steps. It is obvious that the destabilization of precipitated phases affects fracture morphology significantly. The relationship between fracture morphology and the microstructure promotes the evaluation of service reliability of EK61 superalloy.

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