About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
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| Symposium
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Alloy Phase Transformations at Elevated Temperatures
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| Presentation Title |
Investigation of Hot workability and Dynamic Recrystallization of a wrought R65 Nickel-Based Superalloy
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| Author(s) |
Vahid Tari, David J. Bryan, Hossein Beladi |
| On-Site Speaker (Planned) |
Vahid Tari |
| Abstract Scope |
In the current study, the hot deformation behavior of a wrought
γ− γīnickel-based superalloy was investigated using Interrupted hot torsion testing technique with a controlled atmosphere induction furnace. The tests were performed at a temperature range of 1150 °C to 1037 °C and strain rate varied from 0.01 s-1 to 1 s-1 to study the hot workability and dynamic recrystallization of the alloy. The formability of alloy was very limited above γīsolvus temperature due to the presence of boride on grain boundaries, promoting the intergranular fracture. Dynamic recrystallization was the main restoration mechanism at a temperature range of 1093 °C and 1065 °C, leading to the flow softening. The hot deformation behavior of the alloy was modeled using the power-law, Sellars–Tegart equation. The apparent activation energy for deformation was calculated and its variations with strain rate, temperature, precipitates characteristics were discussed.
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