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- W2024743627 abstract "Tensile specimens of superplastic forming grade IN718 superalloy, containing banded microstructure in the as received state, were deformed at high temperatures T to investigate the stress σ versus strain rate ɛ · behaviour, the nature of the stress versus strain ɛ curves, ductility, and microstructure upon failure. The log σ–log ɛ · plot for the ɛ · range ∼5 × 10-6–3 × 10-2 s-1 at T = 1173–1248 K exhibited a strain rate sensitivity index m = 0·62 at low strain rates and m = 0·26 at high strain rates, representing region II and III behaviour, respectively. The activation energies were estimated to be 308 and 353 kJ mol-1, respectively. All the σ–ɛ curves, obtained at ɛ · = 1 × 10-4 s-1 for the temperature range 1173–1273 K, and at T = 1198 K for the strain rate range 1 × 10-4–1 × 10-2 s-1, exhibited initial flow hardening, followed by flow softening. The microstructures revealed dynamic recrystallisation, grain growth, cavitation, and a variation in the amount of second phase particles. Grain growth and cavitation were found to increase with temperature in region II. Excessive grain growth at 1273 K led to the elimination of region II. Grain growth and cavitation were both found to be less pronounced as the strain rate increased in region III." @default.
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- W2024743627 date "2000-02-01" @default.
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- W2024743627 title "Superplastic behaviour of as received superplastic forming grade IN718 superalloy" @default.
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- W2024743627 doi "https://doi.org/10.1179/026708300101507631" @default.
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